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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current [Abstract] |  |  |  |
Federal |  | $ 35,839 | $ 30,492 | $ 32,871
State |  | 6,599 | 5,628 | 4,329
Current tax expense |  | 42,438 | 36,120 | 37,200
Deferred [Abstract] |  |  |  |
Federal |  | 3,850 | 3,994 | 2,521
State |  | (278) | 278 | 482
Deferred tax expense |  | 3,572 | 4,272 | 3,003
Total income tax expense |  | $ 46,010 | 40,392 | 40,203
Income Tax Disclosure [Line Items] |  |  |  |
Federal statutory income tax rate |  | 35.00% |  |
Deferred tax assets [Abstract] |  |  |  |
Allowance for loan losses |  | $ 17,390 | 24,925 |
Deferred compensation |  | 7,230 | 11,578 |
Postretirement benefit obligation |  | 2,159 | 2,929 |
Fair value adjustments from acquisitions |  | 919 | 1,883 |
Unrealized losses on securities |  | 3,715 | 3,259 |
Accrued liabilities |  | 769 | 1,775 |
Stock-based compensation expense |  | 2,642 | 4,817 |
Other |  | 711 | 1,148 |
Total deferred tax assets |  | 35,535 | 52,314 |
Deferred tax liabilities [Abstract] |  |  |  |
Pension benefits |  | 12,439 | 17,303 |
Amortization of intangible assets |  | 11,110 | 17,557 |
Premises and equipment, primarily due to accelerated depreciation |  | 2,792 | 4,375 |
Deferred loan costs |  | 634 | 1,759 |
Cash flow hedge |  | 877 | 1,129 |
Other |  | 390 | 501 |
Total deferred tax liabilities |  | 28,242 | 42,624 |
Net deferred tax asset at year-end |  | 7,293 | 9,690 | 14,940
Net deferred tax asset at beginning of year | $ 7,293 | 9,690 | 14,940 |
(Decrease) in net deferred tax asset |  | (2,397) | (5,250) |
Income tax reconciliation [Abstract] |  |  |  |
Federal income tax at statutory rate |  | 44,857 | 41,581 | 40,820
Tax exempt income |  | (2,303) | (2,205) | (2,037)
Net increase in cash surrender value of life insurance |  | (1,780) | (1,712) | (1,373)
Federal tax credits |  | (1,343) | (1,323) | (939)
State taxes, net of federal tax benefit |  | 4,107 | 3,838 | 3,127
Federal tax reform (Tax Act) |  | 4,407 | 0 | 0
Stock-based compensation, excess tax benefit |  | (1,619) | 0 | 0
Other, net |  | (316) | 213 | 605
Total income tax expense |  | 46,010 | 40,392 | 40,203
Reconciliation of gross unrecognized tax benefits [Roll Forward] |  |  |  |
Beginning balance | $ 665 | 559 | 0 |
Additions for tax positions of prior years |  | 0 | 425 |
Reduction for tax positions of prior years |  | (31) | 0 |
Current period tax positions |  | 137 | 134 |
Ending balance |  | 665 | 559 | $ 0
Amount that would affect the effective tax rate if recognized, gross of tax |  | 525 | $ 363 |
Accounting Standards Update 2016-09 [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Tax benefit associated with equity-based compensation |  | $ 1,800 |  |
Plan [Member] |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |
Federal statutory income tax rate | 21.00% |  |  |
New York State [Member] |  |  |  |
Income Tax Examination [Line Items] |  |  |  |
Open tax year |  | 2013 |  |

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