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2423402 - Disclosure - Accumulated Other Comprehensive Income - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Detail)
(http://www.firstnbcbank.com/role/AccumulatedOtherComprehensiveIncomeSummaryOfChangesInAccumulatedOtherComprehensiveIncomeLossDetail)
TableAccumulated Other Comprehensive Income (Loss) [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001496631 (http://www.sec.gov/CIK)
Accumulated Other Comprehensive Income (Loss) [Line Items]Period [Axis]
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
2013-01-01 - 2013-12-31
Equity Components [Axis]Equity Components [Axis]Equity Components [Axis]
Cash Flow HedgesTerminated Cash Flow HedgesTransfers of Available for Sale Securities to Held to MaturityAvailable for Sale SecuritiesEquity Component [Domain]Cash Flow HedgesTerminated Cash Flow HedgesTransfers of Available for Sale Securities to Held to MaturityAvailable for Sale SecuritiesEquity Component [Domain]Cash Flow HedgesTerminated Cash Flow HedgesTransfers of Available for Sale Securities to Held to MaturityAvailable for Sale SecuritiesEquity Component [Domain]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Beginning balance
(8,396,000) 
(5,194,000) 
(3,354,000) 
(2,793,000) 
(19,737,000) 
(2,054,000) 
0  
(3,710,000) 
(10,751,000) 
(16,515,000) 
(4,455,000) 
0  
0  
1,529,000  
(2,926,000) 
Net change in unrealized gain (loss)
(6,785,000) 
1,326,000  
0  
1,272,000  
(4,187,000) 
(9,757,000) 
(7,990,000) 
0  
12,379,000  
(5,368,000) 
3,694,000  
0  
(5,919,000) 
(18,576,000) 
(20,801,000) 
Reclassification of net losses realized and included in earnings
0  
995,000  
0  
0  
995,000  
    
0  
    
0  
Reclassification of net gains realized and included in earnings
    
0  
0  
0  
0  
(135,000) 
(135,000) 
0  
0  
0  
(316,000) 
(316,000) 
Amortization of unrealized net gain
0  
0  
660,000  
0  
660,000  
0  
0  
547,000  
0  
547,000  
0  
0  
211,000  
0  
211,000  
Income tax benefit related to items of other comprehensive losses
(2,375,000) 
812,000  
232,000  
447,000  
(884,000) 
(3,415,000) 
(2,796,000) 
191,000  
4,286,000  
(1,734,000) 
1,293,000  
0  
(1,998,000) 
(6,612,000) 
(7,317,000) 
Ending balance
(12,806,000) 
 
(3,685,000) 
 
(2,926,000) 
 
(1,968,000) 
 
(21,385,000) 
 
(8,396,000) 
 
(5,194,000) 
 
(3,354,000) 
 
(2,793,000) 
 
(19,737,000) 
 
(2,054,000) 
 
0  
 
(3,710,000) 
 
(10,751,000) 
 
(16,515,000)