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Investment Securities - Schedule of Amortized Cost and Estimated Fair Value, AFS, HTM and Restricted Equity Securities (Details) - USD ($) | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Securities available for sale |  |  |  |  |  |
Amortized Cost | $ 325,381,000 |  | $ 328,693,000 | $ 328,398,000 |  |
Unrealized Gains | 497,000 |  | 155,000 | 69,000 |  |
Unrealized Losses | (47,630,000) |  | (54,168,000) | (54,966,000) |  |
Fair Value (Estimated) | 278,248,000 |  | 274,680,000 | 273,501,000 |  |
Securities to be held to maturity |  |  |  |  |  |
Amortized Cost | 368,071,000 |  | 369,900,000 | 377,671,000 |  |
Unrealized Gains | 122,000 |  | 98,000 | 116,000 |  |
Unrealized Losses | (55,685,000) |  | (55,005,000) | (56,171,000) |  |
Fair Value (Estimated) | 312,508,000 |  | 314,993,000 | 321,616,000 |  |
Less allowance for credit losses | (198,000) | $ (197,000) | (196,000) | (149,000) | $ (182,000) | $ (434,000)
Net securities to be held to maturity | 367,873,000 |  | 369,704,000 | 377,522,000 |  |
Restricted equity securities |  |  |  |  |  |
Federal Home Loan Bank Stock | 6,697,000 |  | 6,166,000 | 6,073,000 |  |
Federal Reserve Bank Stock | 1,037,000 |  | 1,037,000 | 1,037,000 |  |
Restricted equity securities | 7,734,000 |  | 7,203,000 | 7,110,000 |  |
U.S. Treasury & Agency securities |  |  |  |  |  |
Securities available for sale |  |  |  |  |  |
Amortized Cost | 24,544,000 |  | 26,042,000 | 26,038,000 |  |
Unrealized Gains | 0 |  | 0 | 0 |  |
Unrealized Losses | (5,510,000) |  | (6,246,000) | (6,260,000) |  |
Fair Value (Estimated) | 19,034,000 |  | 19,796,000 | 19,778,000 |  |
Securities to be held to maturity |  |  |  |  |  |
Amortized Cost | 38,100,000 |  | 38,100,000 | 38,100,000 |  |
Unrealized Gains | 0 |  | 0 | 0 |  |
Unrealized Losses | (8,879,000) |  | (9,938,000) | (10,063,000) |  |
Fair Value (Estimated) | 29,221,000 |  | 28,162,000 | 28,037,000 |  |
Less allowance for credit losses | 0 |  |  |  |  |
Mortgage-backed securities |  |  |  |  |  |
Securities available for sale |  |  |  |  |  |
Amortized Cost | 258,633,000 |  | 260,267,000 | 259,574,000 |  |
Unrealized Gains | 487,000 |  | 141,000 | 50,000 |  |
Unrealized Losses | (34,704,000) |  | (41,026,000) | (41,801,000) |  |
Fair Value (Estimated) | 224,416,000 |  | 219,382,000 | 217,823,000 |  |
Securities to be held to maturity |  |  |  |  |  |
Amortized Cost | 50,510,000 |  | 52,370,000 | 54,501,000 |  |
Unrealized Gains | 78,000 |  | 15,000 | 11,000 |  |
Unrealized Losses | (10,211,000) |  | (11,360,000) | (11,352,000) |  |
Fair Value (Estimated) | 40,377,000 |  | 41,025,000 | 43,160,000 |  |
State and political subdivisions |  |  |  |  |  |
Securities available for sale |  |  |  |  |  |
Amortized Cost | 40,087,000 |  | 40,148,000 | 40,272,000 |  |
Unrealized Gains | 0 |  | 0 | 0 |  |
Unrealized Losses | (7,400,000) |  | (6,896,000) | (6,902,000) |  |
Fair Value (Estimated) | 32,687,000 |  | 33,252,000 | 33,370,000 |  |
Securities to be held to maturity |  |  |  |  |  |
Amortized Cost | 251,461,000 |  | 252,180,000 | 252,820,000 |  |
Unrealized Gains | 44,000 |  | 83,000 | 105,000 |  |
Unrealized Losses | (34,833,000) |  | (31,739,000) | (32,268,000) |  |
Fair Value (Estimated) | 216,672,000 |  | 220,524,000 | 220,657,000 |  |
Less allowance for credit losses | (79,000) | (81,000) | (80,000) | (56,000) | (69,000) | (212,000)
Asset-backed securities |  |  |  |  |  |
Securities available for sale |  |  |  |  |  |
Amortized Cost | 2,117,000 |  | 2,236,000 | 2,514,000 |  |
Unrealized Gains | 10,000 |  | 14,000 | 19,000 |  |
Unrealized Losses | (16,000) |  | 0 | (3,000) |  |
Fair Value (Estimated) | 2,111,000 |  | 2,250,000 | 2,530,000 |  |
Corporate securities |  |  |  |  |  |
Securities to be held to maturity |  |  |  |  |  |
Amortized Cost | 28,000,000 |  | 27,250,000 | 32,250,000 |  |
Unrealized Gains | 0 |  | 0 | 0 |  |
Unrealized Losses | (1,762,000) |  | (1,968,000) | (2,488,000) |  |
Fair Value (Estimated) | 26,238,000 |  | 25,282,000 | 29,762,000 |  |
Less allowance for credit losses | $ (119,000) | $ (116,000) | $ (116,000) | $ (93,000) | $ (113,000) | $ (222,000)

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