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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Current [Abstract] |  |  |
Federal | $ 32,871 | $ 26,059 | $ 23,536
State | 4,329 | 2,823 | 2,316
Current tax expense | 37,200 | 28,882 | 25,852
Deferred [Abstract] |  |  |
Federal | 2,521 | 6,648 | 2,334
State | 482 | 1,699 | 10
Deferred tax expense | 3,003 | 8,347 | 2,344
Total income tax expense | 40,203 | 37,229 | 28,196
Income tax recorded to stockholders' equity | 3,400 | (1,100) | 7,000
Deferred tax assets [Abstract] |  |  |
Allowance for loan losses | 24,090 | 25,689 |
Deferred compensation | 10,023 | 8,744 |
Postretirement benefit obligation | 2,988 | 2,377 |
Fair value adjustments from acquisitions | 2,543 | 0 |
Unrealized losses on securities | 589 | 0 |
Accrued liabilities | 2,889 | 1,778 |
Stock-based compensation expense | 5,394 | 6,457 |
Equipment leasing | 476 | 1,416 |
Other | 1,477 | 1,325 |
Total deferred tax assets | 50,469 | 47,786 |
Deferred tax liabilities [Abstract] |  |  |
Pension benefits | 11,908 | 12,192 |
Fair value adjustments from acquisitions | 0 | 1,243 |
Unrealized gains on securities | 0 | 1,331 |
Premises and equipment, primarily due to accelerated depreciation | 2,444 | 2,491 |
Deferred loan costs | 1,591 | 1,460 |
Intangible amortization | 19,082 | 14,162 |
Other | 504 | 390 |
Total deferred tax liabilities | 35,529 | 33,269 |
Net deferred tax asset at year-end | 14,940 | 14,517 | 21,789
Net deferred tax asset (liability) at beginning of year | 14,517 | 21,789 |
Increase (Decrease) in net deferred tax asset | $ 423 | (7,272) |
Federal statutory income tax rate | 35.00% |  |
Income tax reconciliation [Abstract] |  |  |
Federal income tax at statutory rate | $ 40,820 | 39,306 | 31,482
Tax exempt income | (2,037) | (2,250) | (2,433)
Net increase in CSV of life insurance | (1,373) | (1,734) | (1,166)
Low income housing tax credits | (939) | (880) | (819)
State taxes, net of federal tax benefit | 3,127 | 2,939 | 1,512
Other, net | 605 | (152) | (380)
Total income tax expense | $ 40,203 | $ 37,229 | $ 28,196

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