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Investment Securities - Credit Quality Indicators (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | $ 2,307,649 | $ 2,288,791
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 1,251,364 | 1,247,310
Commercial Mortgage Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 440,476 | 433,827
Mortgage-backed Securities, Issued by Private Enterprises |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 355,342 | 350,493
US Treasury Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 189,985 | 187,033
Corporate Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 70,482 | 70,128
Standard & Poor's, AAA Rating |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 926,689 | 914,620
Standard & Poor's, AAA Rating | US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 571,347 | 564,127
Standard & Poor's, AAA Rating | Commercial Mortgage Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 | 0
Standard & Poor's, AAA Rating | Mortgage-backed Securities, Issued by Private Enterprises |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 355,342 | 350,493
Standard & Poor's, AAA Rating | US Treasury Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 | 0
Standard & Poor's, AAA Rating | Corporate Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 | 0
Standard & Poor's, AA+ Rating |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 999,533 | 1,018,402
Standard & Poor's, AA+ Rating | US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 369,072 | 397,542
Standard & Poor's, AA+ Rating | Commercial Mortgage Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 440,476 | 433,827
Standard & Poor's, AA+ Rating | Mortgage-backed Securities, Issued by Private Enterprises |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 | 0
Standard & Poor's, AA+ Rating | US Treasury Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 189,985 | 187,033
Standard & Poor's, AA+ Rating | Corporate Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 | 0
Standard & Poor's, AA Rating |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 218,581 | 167,905
Standard & Poor's, AA Rating | US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 218,581 | 167,905
Standard & Poor's, AA Rating | Commercial Mortgage Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 | 0
Standard & Poor's, AA Rating | Mortgage-backed Securities, Issued by Private Enterprises |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 | 0
Standard & Poor's, AA Rating | US Treasury Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 | 0
Standard & Poor's, AA Rating | Corporate Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 | 0
Standard & Poor's, AA- Rating |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 72,952 | 86,243
Standard & Poor's, AA- Rating | US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 72,952 | 86,243
Standard & Poor's, AA- Rating | Commercial Mortgage Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 | 0
Standard & Poor's, AA- Rating | Mortgage-backed Securities, Issued by Private Enterprises |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 | 0
Standard & Poor's, AA- Rating | US Treasury Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 | 0
Standard & Poor's, AA- Rating | Corporate Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 | 0
Standard & Poor's, A Rating |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 1,667 | 1,787
Standard & Poor's, A Rating | US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 1,667 | 1,787
Standard & Poor's, A Rating | Commercial Mortgage Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 | 0
Standard & Poor's, A Rating | Mortgage-backed Securities, Issued by Private Enterprises |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 | 0
Standard & Poor's, A Rating | US Treasury Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 | 0
Standard & Poor's, A Rating | Corporate Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 | 0
Standard & Poor's, BBB Rating |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 44,507 | 44,371
Standard & Poor's, BBB Rating | US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 | 0
Standard & Poor's, BBB Rating | Commercial Mortgage Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 | 0
Standard & Poor's, BBB Rating | Mortgage-backed Securities, Issued by Private Enterprises |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 | 0
Standard & Poor's, BBB Rating | US Treasury Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 | 0
Standard & Poor's, BBB Rating | Corporate Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 44,507 | 44,371
Standard & Poor's, No Credit Rating |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 43,720 | 43,456
Standard & Poor's, No Credit Rating | US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 17,745 | 17,699
Standard & Poor's, No Credit Rating | Commercial Mortgage Backed Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 | 0
Standard & Poor's, No Credit Rating | Mortgage-backed Securities, Issued by Private Enterprises |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 | 0
Standard & Poor's, No Credit Rating | US Treasury Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | 0 | 0
Standard & Poor's, No Credit Rating | Corporate Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities, Held-to-Maturity, Excluding Accrued Interest, before Allowance for Credit Loss | $ 25,975 | $ 25,757

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