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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Current [Abstract] |  |  |
Federal | $ 23,049 | $ 22,829 | $ 51,077
State | 7,039 | 5,890 | 12,934
Total current | 30,088 | 28,719 | 64,011
Deferred [Abstract] |  |  |
Federal | 8,306 | 4,593 | (15,862)
State | 423 | 1,365 | (3,988)
Total deferred | 8,729 | 5,958 | (19,850)
Total income tax expense | 38,817 | 34,677 | 44,161
Deferred tax assets [Abstract] |  |  |
Allowance for loan losses | 29,229 | 28,039 |
Lease liability | 7,646 | 6,917 |
Deferred compensation | 10,581 | 9,915 |
Fair value adjustments on acquisitions | 15,958 | 18,306 |
Loan fees | 23,660 | 30,778 |
Stock-based compensation expense | 3,375 | 3,006 |
Unrealized losses on securities | 41,346 | 45,446 |
Other | 6,382 | 9,362 |
Total deferred tax assets | 138,177 | 151,769 |
Deferred tax liabilities [Abstract] |  |  |
Pension benefits | 16,705 | 14,742 |
Lease right-of-use asset | 7,195 | 6,551 |
Amortization of intangible assets | 22,476 | 22,850 |
Premises and equipment, primarily due to accelerated depreciation | 1,510 | 2,746 |
Other | 2,072 | 1,669 |
Total deferred tax liabilities | 49,958 | 48,558 |
Net deferred tax asset at year-end | 88,219 | 103,211 | 97,320
Net deferred tax asset at beginning of year | 103,211 | 97,320 |
(Decrease) increase in net deferred tax asset | (14,992) | 5,891 |
Income tax reconciliation [Abstract] |  |  |
Federal income tax at statutory rate | 37,686 | 32,226 | 41,193
Tax exempt income | (1,783) | (1,442) | (984)
Net increase in cash surrender value of life insurance | (1,866) | (1,367) | (1,215)
Federal tax credits | (1,171) | (1,297) | (1,398)
State taxes, net of federal tax benefit | 6,008 | 5,732 | 7,067
Other, net | (57) | 825 | (502)
Total income tax expense | 38,817 | 34,677 | 44,161
Reconciliation of gross unrecognized tax benefits [Roll Forward] |  |  |
Beginning balance | 2,879 | 1,942 |
Additions for tax positions of prior years | 57 | 647 |
Reduction for tax positions of prior years | (265) | (104) |
Current period tax positions | 243 | 394 |
Ending balance | 2,914 | 2,879 | $ 1,942
Amount that would affect the effective tax rate if recognized, gross of tax | 2,302 | 2,274 |
Income Tax Examination [Abstract] |  |  |
Interest expense | $ 600 | $ 500 |
State and Local Jurisdiction [Member] |  |  |
Income Tax Examination [Abstract] |  |  |
Tax years under examination | 2017 2018 2019 |  |

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Subparagraph (a)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Subparagraph (a)(7) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 217 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-217 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10B -Publisher FASB -URI https://asc.fasb.org/1943274/2147482525/740-10-45-10B + Details
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