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Investment Securities - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands | 3 Months Ended |
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Mar. 31, 2025 | Dec. 31, 2024
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |
Available-for-sale investments, One year or less | $ 249,596 |
Available-for-sale investments, After 1 through 5 years | 154,954 |
Available-for-sale investments, After 5 through 10 years | 132,164 |
Available-for-sale investments, After ten years | 503,013 |
Available-for-sale investments, Fair Value | $ 1,039,727 | $ 1,063,292
Available-for-sale, Weighted average yield, One year or less (in hundredths) | 2.06% |
Available-for-sale, Weighted average yield, After 1 through 5 years (in hundredths) | 2.33% |
Available-for-sale, Weighted average yield, After 5 through 10 years (in hundredths) | 2.26% |
Available-for-sale, Weighted average yield, After ten years (in hundredths) | 1.80% |
Available-for-sale, Weighted average yield, Total (in hundredths) | 2.00% |
Available-for-sale, Full Tax-equivalent yield, One year or less (in hundredths) | 2.17% |
Available-for-sale, Full Tax-equivalent yield, After 1 through 5 years (in hundredths) | 2.82% |
Available-for-sale, Full Tax-equivalent yield, After 5 through 10 years (in hundredths) | 2.69% |
Available-for-sale, Full Tax-equivalent yield, After ten years (in hundredths) | 1.83% |
Available-for-sale, Full Tax-equivalent yield, Total (in hundredths) | 2.17% |
Held-to-maturity, Maturity [Abstract] |  |
Held-to-maturity, One Year or less | $ 0 |
Held-to-maturity, After 1 through 5 years | 0 |
Held-to-maturity, After 5 through 10 years | 0 |
Held-to-maturity, After ten years | 2,285 |
Held-to-maturity | $ 2,285 | 2,279
Held To Maturity, Weighted average yield, One year or less | 0.00% |
Held To Maturity, Weighted average yield, After 1 through 5 years | 0.00% |
Held To Maturity, Weighted average yield, After 5 through 10 years | 0.00% |
Held To Maturity, Weighted average yield, After ten years | 0.00% |
Held To Maturity, Weighted average yield, Total | 0.00% |
Held To Maturity, Full tax-equivalent yield, One year or less | 0.00% |
Held To Maturity, Full tax-equivalent yield, After 1 through 5 years | 0.00% |
Held To Maturity, Full tax-equivalent yield, After 5 through 10 years | 0.00% |
Held To Maturity, Full tax-equivalent yield, After ten years | 0.00% |
Held To Maturity, Full tax-equivalent yield, Total | 0.00% |
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies |  |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |
Available-for-sale investments, One year or less | $ 173,943 |
Available-for-sale investments, After 1 through 5 years | 10,990 |
Available-for-sale investments, After 5 through 10 years | 0 |
Available-for-sale investments, After ten years | 0 |
Available-for-sale investments, Fair Value | 184,933 | 191,358
Obligations of States and Political Subdivisions |  |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |
Available-for-sale investments, One year or less | 30,126 |
Available-for-sale investments, After 1 through 5 years | 123,008 |
Available-for-sale investments, After 5 through 10 years | 100,221 |
Available-for-sale investments, After ten years | 8,750 |
Available-for-sale investments, Fair Value | 262,105 | 267,740
Mortgage-backed Securities: GSE Residential |  |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |
Available-for-sale investments, One year or less | 116 |
Available-for-sale investments, After 1 through 5 years | 8,194 |
Available-for-sale investments, After 5 through 10 years | 31,129 |
Available-for-sale investments, After ten years | 494,263 |
Available-for-sale investments, Fair Value | 533,702 | 539,742
Other Securities |  |
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |
Available-for-sale investments, One year or less | 45,411 |
Available-for-sale investments, After 1 through 5 years | 12,762 |
Available-for-sale investments, After 5 through 10 years | 814 |
Available-for-sale investments, After ten years | 0 |
Available-for-sale investments, Fair Value | 58,987 | 64,452
Other Investments |  |
Held-to-maturity, Maturity [Abstract] |  |
Held-to-maturity, One Year or less | 0 |
Held-to-maturity, After 1 through 5 years | 0 |
Held-to-maturity, After 5 through 10 years | 0 |
Held-to-maturity, After ten years | 2,285 |
Held-to-maturity | $ 2,285 | $ 2,279

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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 320 -Name Accounting Standards Codification -Section 50 -Paragraph 3A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477268/942-320-50-3A + Details
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