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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Current [Abstract] |  |  |
Federal | $ 35,483 | $ 36,358 | $ 28,475
State | 8,626 | 9,768 | 7,653
Total Current | 44,109 | 46,126 | 36,128
Deferred [Abstract] |  |  |
Federal | 507 | (14,021) | (1,379)
State | 357 | (3,406) | (338)
Total Deferred | 864 | (17,427) | (1,717)
Total income tax expense | 44,973 | 28,699 | 34,411
Deferred tax assets [Abstract] |  |  |
Allowance for loan losses | 22,479 | 27,282 |
Lease liability | 6,744 | 8,141 |
Deferred compensation | 9,584 | 11,602 |
Postretirement benefit obligation | 1,286 | 1,511 |
Fair value adjustments from acquisitions | 199 | 259 |
Loan fees | 12,936 | 5,400 |
Accrued liabilities | 1,424 | 1,307 |
Stock-based compensation expense | 2,679 | 3,213 |
Unrealized losses on securities | 1,482 | 0 |
Other | 4,200 | 3,558 |
Total deferred tax assets | 63,013 | 62,273 |
Deferred tax liabilities [Abstract] |  |  |
Pension benefits | 16,137 | 14,406 |
Lease right-of-use asset | 5,681 | 6,567 |
Amortization of intangible assets | 13,187 | 12,725 |
Premises and equipment, primarily due to accelerated depreciation | 4,962 | 4,774 |
Unrealized gain on securities | 0 | 7,732 |
Other | 1,008 | 952 |
Total deferred tax liabilities | 40,975 | 47,156 |
Net deferred tax asset at year-end | 22,038 | 15,117 | 2,534
Net deferred tax asset at beginning of year | 15,117 | 2,534 |
Increase in net deferred tax asset | 6,921 | 12,583 |
Income tax reconciliation [Abstract] |  |  |
Federal income tax at statutory rate | 41,971 | 27,948 | 32,641
Tax exempt income | (1,014) | (981) | (1,233)
Net increase in cash surrender value of life insurance | (1,230) | (1,135) | (927)
Federal tax credits | (1,884) | (1,705) | (1,458)
State taxes, net of federal tax benefit | 7,097 | 5,026 | 5,773
Stock-based compensation, excess tax benefit | (323) | (152) | (342)
Other, net | 356 | (302) | (43)
Total income tax expense | 44,973 | 28,699 | 34,411
Reconciliation of gross unrecognized tax benefits [Roll Forward] |  |  |
Beginning balance | 1,178 | 779 |
Additions for tax positions of prior years | 80 | 254 |
Current period tax positions | 287 | 145 |
Ending balance | 1,545 | 1,178 | $ 779
Amount that would affect the effective tax rate if recognized, gross of tax | $ 1,221 | $ 931 |
State and Local Jurisdiction [Member] |  |  |
Income Tax Examination [Abstract] |  |  |
Tax years under examination | 2015 2016 2017 2018 2019 |  |

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