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Investments - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Available-for-sale securities: |  |
Amortized cost | $ 472,245 | $ 459,537
Gross unrealized gains | 2,386 | 545
Gross unrealized losses | (23,274) | (34,170)
Allowance for credit losses | 0 | 0
Fair value | 451,357 | 425,912
U.S. Agency Securities [Member] |  |
Available-for-sale securities: |  |
Amortized cost | 54,652 | 58,594
Gross unrealized gains | 12 | 6
Gross unrealized losses | (3,247) | (5,113)
Allowance for credit losses | 0 | 0
Fair value | 51,417 | 53,487
U.S. Treasury Securities [Member] |  |
Available-for-sale securities: |  |
Amortized cost | 96,467 | 126,220
Gross unrealized gains | 234 | 6
Gross unrealized losses | (2,774) | (5,724)
Allowance for credit losses | 0 | 0
Fair value | 93,927 | 120,502
Obligations of State and Political Subdivisions [Member] |  |
Available-for-sale securities: |  |
Amortized cost | 120,474 | 103,137
Gross unrealized gains | 649 | 4
Gross unrealized losses | (6,938) | (8,239)
Allowance for credit losses | 0 | 0
Fair value | 114,185 | 94,902
Corporate Obligations [Member] |  |
Available-for-sale securities: |  |
Amortized cost | 11,280 | 11,206
Gross unrealized gains | 368 | 297
Gross unrealized losses | (484) | (1,065)
Allowance for credit losses | 0 | 0
Fair value | 11,164 | 10,438
Mortgage-backed Securities in Government Sponsored Entities [Member] |  |
Available-for-sale securities: |  |
Amortized cost | 189,372 | 160,380
Gross unrealized gains | 1,123 | 232
Gross unrealized losses | (9,831) | (14,029)
Allowance for credit losses | 0 | 0
Fair value | $ 180,664 | $ 146,583

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