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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Current [Abstract] |  |  |
Federal | $ 28,475 | $ 15,762 | $ 35,839
State | 7,653 | 5,977 | 6,599
Total Current | 36,128 | 21,739 | 42,438
Deferred [Abstract] |  |  |
Federal | (1,379) | 2,281 | 3,850
State | (338) | 416 | (278)
Total Deferred | (1,717) | 2,697 | 3,572
Total income tax expense | $ 34,411 | 24,436 | $ 46,010
Components of income taxes [Abstract] |  |  |
Federal statutory income tax rate | 21.00% |  | 35.00%
Non-cash adjustment for remeasurement of deferred tax assets and liabilities for corporate rate reduction | $ 0 | 0 | $ 4,407
Tax benefit primarily related to changes in accounting method |  | 5,500 |
Deferred tax assets [Abstract] |  |  |
Allowance for loan losses | 18,535 | 18,042 |
Lease liability | 9,331 | 0 |
Deferred compensation | 8,336 | 7,340 |
Postretirement benefit obligation | 1,631 | 1,962 |
Fair value adjustments from acquisitions | 422 | 663 |
Unrealized losses on securities | 0 | 4,893 |
Accrued liabilities | 1,176 | 913 |
Stock-based compensation expense | 3,032 | 2,821 |
Other | 1,498 | 1,008 |
Total deferred tax assets | 43,961 | 37,642 |
Deferred tax liabilities [Abstract] |  |  |
Pension benefits | 13,014 | 10,782 |
Lease right-of-use asset | 9,259 | 0 |
Amortization of intangible assets | 12,202 | 11,525 |
Premises and equipment, primarily due to accelerated depreciation | 5,137 | 4,973 |
Unrealized gain on securities | 1,770 | 0 |
Other | 45 | 1,567 |
Total deferred tax liabilities | 41,427 | 28,847 |
Net deferred tax asset at year-end | 2,534 | 8,795 | 7,293
Net deferred tax asset at beginning of year | 8,795 | 7,293 |
(Decrease) increase in net deferred tax asset | (6,261) | 1,502 |
Income tax reconciliation [Abstract] |  |  |
Federal income tax at statutory rate | 32,641 | 28,770 | 44,857
Tax exempt income | (1,233) | (1,456) | (2,303)
Net increase in cash surrender value of life insurance | (927) | (973) | (1,780)
Federal tax credit | (1,458) | (1,499) | (1,343)
State taxes, net of federal tax benefit | 5,773 | 5,051 | 4,107
Federal tax reform (Tax Act) | 0 | 0 | 4,407
Accounting method changes - tax rate change impact | 0 | (5,326) | 0
Stock-based compensation, excess tax benefit | (342) | (456) | (1,619)
Other, net | (43) | 325 | (316)
Total income tax expense | 34,411 | 24,436 | 46,010
Reconciliation of gross unrecognized tax benefits [Roll Forward] |  |  |
Beginning balance | 641 | 665 |
Additions for tax positions of prior years | 26 | 27 |
Reduction for tax positions of prior years | 0 | (159) |
Current period tax positions | 112 | 108 |
Ending balance | 779 | 641 | $ 665
Amount that would affect the effective tax rate if recognized, gross of tax | $ 615 | $ 506 |
State and Local Jurisdiction [Member] | New York State Division of Taxation and Finance [Member] |  |  |
Income Tax Examination [Abstract] |  |  |
Tax years under examination | 2014 2015 2016 |  |

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