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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Current [Abstract] |  |  |
Federal | $ 36,358 | $ 28,475 | $ 15,762
State | 9,768 | 7,653 | 5,977
Total Current | 46,126 | 36,128 | 21,739
Deferred [Abstract] |  |  |
Federal | (14,021) | (1,379) | 2,281
State | (3,406) | (338) | 416
Total Deferred | (17,427) | (1,717) | 2,697
Total income tax expense | 28,699 | 34,411 | 24,436
Components of income taxes [Abstract] |  |  |
Tax benefit primarily related to changes in accounting method |  |  | 5,500
Deferred tax assets [Abstract] |  |  |
Allowance for loan losses | 27,282 | 18,535 |
Lease liability | 8,141 | 9,331 |
Deferred compensation | 11,602 | 8,336 |
Postretirement benefit obligation | 1,511 | 1,631 |
Fair value adjustments from acquisitions | 259 | 422 |
Loan fees | 5,400 | 1,384 |
Accrued liabilities | 1,307 | 1,176 |
Stock-based compensation expense | 3,213 | 3,032 |
Other | 3,558 | 1,498 |
Total deferred tax assets | 62,273 | 45,345 |
Deferred tax liabilities [Abstract] |  |  |
Pension benefits | 14,406 | 13,014 |
Lease right-of-use asset | 6,567 | 9,259 |
Amortization of intangible assets | 12,725 | 12,202 |
Premises and equipment, primarily due to accelerated depreciation | 4,774 | 5,137 |
Unrealized gain on securities | 7,732 | 1,770 |
Other | 952 | 1,429 |
Total deferred tax liabilities | 47,156 | 42,811 |
Net deferred tax asset at year-end | 15,117 | 2,534 | 8,795
Net deferred tax asset at beginning of year | 2,534 | 8,795 |
Increase (decrease) in net deferred tax asset | 12,583 | (6,261) |
Income tax reconciliation [Abstract] |  |  |
Federal income tax at statutory rate | 27,948 | 32,641 | 28,770
Tax exempt income | (981) | (1,233) | (1,456)
Net increase in cash surrender value of life insurance | (1,135) | (927) | (973)
Federal tax credit | (1,705) | (1,458) | (1,499)
State taxes, net of federal tax benefit | 5,026 | 5,773 | 5,051
Accounting method changes - tax rate change impact | 0 | 0 | (5,326)
Stock-based compensation, excess tax benefit | (152) | (342) | (456)
Other, net | (302) | (43) | 325
Total income tax expense | 28,699 | 34,411 | 24,436
Reconciliation of gross unrecognized tax benefits [Roll Forward] |  |  |
Beginning balance | 779 | 641 |
Additions for tax positions of prior years | 254 | 26 |
Current period tax positions | 145 | 112 |
Ending balance | 1,178 | 779 | $ 641
Amount that would affect the effective tax rate if recognized, gross of tax | $ 931 | $ 615 |
State and Local Jurisdiction [Member] | New York State Division of Taxation and Finance [Member] |  |  |
Income Tax Examination [Abstract] |  |  |
Tax years under examination | 2015 2016 2017 2018 2019 |  |

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