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1114 - Disclosure - Fair Value Measurements - Reconciliation of Items Using Level Three Inputs (Detail)
(http://www.baybanks.com/taxonomy/role/DisclosureFairValueMeasurementsReconciliationOfItemsUsingLevelThreeInputs)
TableFair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001034594 (http://www.sec.gov/CIK)
Legal EntityEntity [Domain]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
Major Types of Debt and Equity Securities
Mortgage Servicing RightsCorporate Bonds
Beginning balance
658,000  
3,945,000  
Purchases
 
3,750,000  
Impairments
0  
0  
Fair value adjustments
13,000  
9,000  
Sales
0  
0  
Ending balance
671,000  
 
7,704,000