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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2015
Income Tax Disclosure [Abstract] |
Schedule of Income Tax Expense (Benefit) | Income tax expense (benefit) for the years ended December 31 is comprised of:
(dollars in thousands) | 2015 |  | 2014 |  | 2013 |
Current | $ | 24,825 |  | $ | 15,979 |  | $ | 16,836 |
Deferred | (427 | ) | 1,536 |  | (2,358 | )
Total | $ | 24,398 |  | $ | 17,515 |  | $ | 14,478 |
Schedule of Statutory to Effective Tax Rate Reconciliation | The statutory to effective tax rate reconciliation for the years ended December 31 is as follows:
| 2015 |  | 2014 |  | 2013 |
Statutory tax rate | 35.0 | % | 35.0 | % | 35.0 | %
Low income housing tax credits | (4.4 | )% | (5.8 | )% | (6.8 | )%
Tax-exempt interest | (4.1 | )% | (4.6 | )% | (4.5 | )%
Bank owned life insurance | (0.8 | )% | (0.8 | )% | (1.0 | )%
Other | 1.0 | % | (0.6 | )% | (0.4 | )%
Effective Tax Rate | 26.7 | % | 23.2 | % | 22.3 | %
Schedule of Significant Components of Temporary Differences with Deferred Tax Assets and Liabilities | Significant components of our temporary differences were as follows at December 31:
(dollars in thousands) | 2015 |  | 2014 |
Deferred Tax Liabilities: |  |
Net unrealized holding gains on securities available-for-sale | $ | (3,563 | ) | $ | (3,783 | )
Prepaid pension | (2,865 | ) | (3,472 | )
Deferred loan income | (2,847 | ) | (2,165 | )
Purchase accounting adjustments | — |  | (631 | )
Depreciation on premises and equipment | (1,226 | ) | (1,590 | )
Other | (809 | ) | (812 | )
Total Deferred Tax liabilities | (11,310 | ) | (12,453 | )
Deferred Tax Assets: |  |
Allowance for loan losses | 17,740 |  | 17,567 |
Purchase accounting adjustments | 1,298 |  | — |
Other employee benefits | 2,556 |  | 2,453 |
Low income housing partnerships | 4,531 |  | 4,049 |
Net adjustment to funded status of pension | 12,425 |  | 11,089 |
Impairment of securities | 1,354 |  | 1,313 |
State net operating loss carryforwards | 2,670 |  | 2,249 |
Other | 6,155 |  | 4,668 |
Gross Deferred Tax Assets | 48,729 |  | 43,388 |
Less: Valuation allowance | (2,670 | ) | (2,249 | )
Total Deferred Tax Assets | 46,059 |  | 41,139 |
Net Deferred Tax Asset | $ | 34,749 |  | $ | 28,686 |
Schedule of Reconciliation of Change in Federal and State Gross Unrecognized Tax Benefits | The following table reconciles the change in Federal and State gross unrecognized tax benefits, or UTB, for the years ended December 31:
(dollars in thousands) | 2015 | 2014 | 2013
Balance at beginning of year | $ | 284 |  | $ | 1,902 |  | $ | 978 |
Prior period tax positions |  |  |
Increase | 818 |  | 55 |  | 924 |
Decrease | — |  | (1,673 | ) | — |
Current period tax positions | — |  | — |  | — |
Reductions for statute of limitations expirations | — |  | — |  | — |
Balance at End of Year | $ | 1,102 |  | $ | 284 |  | $ | 1,902 |
Amount That Would Impact the Effective Tax Rate if Recognized | $ | 542 |  | $ | 184 |  | $ | 148 |

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