| December 31, | ||||||||
| (dollars in thousands) | 2017 | 2016 | ||||||
| Deferred tax assets: | ||||||||
| Loan and lease loss reserve | $ | 3,948 | $ | 6,492 | ||||
| Other reserves | 3,169 | 3,611 | ||||||
| Net operating loss carry-forward | 11,113 | 471 | ||||||
| Alternative minimum tax credits | 1,116 | 567 | ||||||
| Unrealized depreciation of available for sale securities | 761 | 663 | ||||||
| Defined benefit plans | 1,361 | 2,068 | ||||||
| RBPI Merger Fair Values | 4,726 | — | ||||||
| Total deferred tax asset | $ | 26,194 | $ | 13,872 | ||||
| Deferred tax liabilities: | ||||||||
| Other reserves | $ | 19 | $ | 52 | ||||
| Originated MSRs | 1,253 | 1,969 | ||||||
| Amortizing fair value adjustments | 970 | 1,336 | ||||||
| Other | 53 | — | ||||||
| Total deferred tax liability | $ | 2,295 | $ | 3,357 | ||||
| Total net deferred tax asset | $ | 23,899 | $ | 10,515 | ||||
December 31, | ||||||||||||
| (dollars in thousands) | 2017 | 2016 | 2015 | |||||||||
| Current | $ | 13,812 | $ | 16,492 | $ | 12,006 | ||||||
| Deferred | 20,418 | 1,676 | (2,834 | ) | ||||||||
| Total | $ | 34,230 | $ | 18,168 | $ | 9,172 | ||||||
| (dollars in thousands) | 2017 | Tax Rate | 2016 | Tax Rate | 2015 | Tax Rate | ||||||||||||||||||
| Computed tax expense at statutory federal rate | $ | 20,036 | 35.0 | % | $ | 18,972 | 35.0 | % | $ | 9,074 | 35.0 | % | ||||||||||||
| Tax-exempt income | (600 | ) | (1.0 | ) | (758 | ) | (1.4 | ) | (622 | ) | (2.4 | ) | ||||||||||||
| State tax (net of federal tax benefit) | 303 | 0.5 | 425 | 0.8 | 299 | 1.2 | ||||||||||||||||||
| Non-deductible merger expense | 455 | 0.8 | — | — | 105 | 0.4 | ||||||||||||||||||
| Excess tax benefit – stock based compensation | (1,049 | ) | (1.8 | ) | (565 | ) | (1.0 | ) | — | — | ||||||||||||||
| Adjustment to net deferred tax assets for enacted changes in tax laws and rates | 15,193 | 26.5 | — | — | — | — | ||||||||||||||||||
| Other, net | (108 | ) | (0.2 | ) | 94 | 0.1 | 316 | 1.2 | ||||||||||||||||
| Total income tax expense | $ | 34,230 | 59.8 | % | $ | 18,168 | 33.5 | % | $ | 9,172 | 35.4 | % | ||||||||||||
| Components of Provi sional Tax Expense Related to Tax Law Changes | |||||
(dollars in thousands) | |||||
| Deferred taxes related to items recognized in continuing operations | $ | 14,410 | |||
| Deferred taxes on net actuarial loss on defined benefit post-retirement benefit plans | 275 | ||||
| Deferred taxes on net unrealized losses on available for sale investment securities | 507 | ||||
| $ | 15,192 | ||||