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Investment Securities - Available for Sale and Held for Maturity Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Available-for-sale: [Abstract] |  |
Amortized Cost | $ 1,257,436 | $ 1,363,721
Gross Unrealized Gains | 690 | 1,310
Gross Unrealized (Losses) | (194,834) | (193,459)
Fair Value | 1,063,292 | 1,171,572
Held-to-maturity: [Abstract] |  |
Held-to-maturity | 2,279 | 2,286
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | 0 | 0
Fair Value | 2,279 | 2,286
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies |  |
Available-for-sale: [Abstract] |  |
Amortized Cost | 212,513 | 237,875
Gross Unrealized Gains | 3 | 0
Gross Unrealized (Losses) | (21,158) | (26,219)
Fair Value | 191,358 | 211,656
Obligations of States and Political Subdivisions |  |
Available-for-sale: [Abstract] |  |
Amortized Cost | 324,046 | 337,835
Gross Unrealized Gains | 135 | 152
Gross Unrealized (Losses) | (56,441) | (49,371)
Fair Value | 267,740 | 288,616
Mortgage-backed Securities: GSE Residential |  |
Available-for-sale: [Abstract] |  |
Amortized Cost | 653,760 | 714,216
Gross Unrealized Gains | 552 | 1,158
Gross Unrealized (Losses) | (114,570) | (113,074)
Fair Value | 539,742 | 602,300
Other Securities |  |
Available-for-sale: [Abstract] |  |
Amortized Cost | 67,117 | 73,795
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | (2,665) | (4,795)
Fair Value | 64,452 | 69,000
Held-to-maturity: [Abstract] |  |
Held-to-maturity | 2,279 | 2,286
Gross Unrealized Gains | 0 | 0
Gross Unrealized (Losses) | 0 | 0
Fair Value | $ 2,279 | $ 2,286

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