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Securities & Allowance for Securities Credit Losses - Schedule of Amortized Cost and Fair Value (Details) - USD ($) | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
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Securities available for sale: |  |  |  |  |  |  |
Amortized Cost | $ 550,591,000 |  | $ 365,323,000 |  |  |  |
Gross Unrealized Gains | 1,021,000 |  | 87,000 |  |  |  |
Gross Unrealized (Losses) | (3,843,000) |  | (7,081,000) |  |  |  |
Fair Value | 547,769,000 |  | 358,329,000 | [1] |  |  |
Allowance for Credit Losses | 0 |  | 0 |  | $ 0 |  | $ 0
Securities held to maturity: |  |  |  |  |  |  |
Amortized Cost | 283,913,000 |  | 300,653,000 |  |  |  |
Gross Unrealized Gains | 78,000 |  | 48,000 |  |  |  |
Gross Unrealized (Losses) | (12,852,000) |  | (21,750,000) |  |  |  |
Fair Value | 271,139,000 |  | 278,951,000 |  |  |  |
Allowance for Credit Losses | (133,000) | $ (144,000) | (202,000) |  | (261,000) | $ (248,000) | (348,000)
Total securities, Amortized Cost | 834,504,000 |  | 665,976,000 |  |  |  |
Total securities, Accumulated Unrecognized Gain | 1,099,000 |  | 135,000 |  |  |  |
Total securities, Accumulated Unrecognized Loss | (16,695,000) |  | (28,831,000) |  |  |  |
Total securities, Fair Value | 818,908,000 |  | 637,280,000 |  |  |  |
Total securities, Allowance for Credit Losses | (133,000) |  | (202,000) |  |  |  |
U.S. government and federal agencies |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |
Amortized Cost | 384,409,000 |  | 207,935,000 |  |  |  |
Gross Unrealized Gains | 625,000 |  | 29,000 |  |  |  |
Gross Unrealized (Losses) | (1,012,000) |  | (1,561,000) |  |  |  |
Fair Value | 384,022,000 |  | 206,403,000 |  |  |  |
Allowance for Credit Losses | 0 |  | 0 |  | 0 |  | 0
Securities held to maturity: |  |  |  |  |  |  |
Amortized Cost | 115,454,000 |  | 122,452,000 |  |  |  |
Gross Unrealized Gains | 2,000 |  | 0 |  |  |  |
Gross Unrealized (Losses) | (5,554,000) |  | (9,181,000) |  |  |  |
Fair Value | 109,902,000 |  | 113,271,000 |  |  |  |
Allowance for Credit Losses | 0 | 0 | 0 |  | 0 | 0 | 0
Mortgage backed securities |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |
Amortized Cost | 6,359,000 |  | 7,976,000 |  |  |  |
Gross Unrealized Gains | 1,000 |  | 1,000 |  |  |  |
Gross Unrealized (Losses) | (381,000) |  | (582,000) |  |  |  |
Fair Value | 5,979,000 |  | 7,395,000 |  |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |  |
Securities held to maturity: |  |  |  |  |  |  |
Amortized Cost | 1,155,000 |  | 1,168,000 |  |  |  |
Gross Unrealized Gains | 0 |  | 0 |  |  |  |
Gross Unrealized (Losses) | (10,000) |  | (51,000) |  |  |  |
Fair Value | 1,145,000 |  | 1,117,000 |  |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |  |
Corporate bonds |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |
Amortized Cost | 56,828,000 |  | 44,707,000 |  |  |  |
Gross Unrealized Gains | 252,000 |  | 20,000 |  |  |  |
Gross Unrealized (Losses) | (228,000) |  | (753,000) |  |  |  |
Fair Value | 56,852,000 |  | 43,974,000 |  |  |  |
Allowance for Credit Losses | 0 |  | 0 |  | 0 |  | 0
Securities held to maturity: |  |  |  |  |  |  |
Amortized Cost | 50,815,000 |  | 57,470,000 |  |  |  |
Gross Unrealized Gains | 65,000 |  | 43,000 |  |  |  |
Gross Unrealized (Losses) | (632,000) |  | (1,698,000) |  |  |  |
Fair Value | 50,248,000 |  | 55,815,000 |  |  |  |
Allowance for Credit Losses | (104,000) | (114,000) | (171,000) |  | (230,000) | (215,000) | (322,000)
State and municipal securities |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |
Amortized Cost | 102,995,000 |  | 104,705,000 |  |  |  |
Gross Unrealized Gains | 143,000 |  | 37,000 |  |  |  |
Gross Unrealized (Losses) | (2,222,000) |  | (4,185,000) |  |  |  |
Fair Value | 100,916,000 |  | 100,557,000 |  |  |  |
Allowance for Credit Losses | 0 |  | 0 |  | 0 |  | 0
Securities held to maturity: |  |  |  |  |  |  |
Amortized Cost | 116,489,000 |  | 119,563,000 |  |  |  |
Gross Unrealized Gains | 11,000 |  | 5,000 |  |  |  |
Gross Unrealized (Losses) | (6,656,000) |  | (10,820,000) |  |  |  |
Fair Value | 109,844,000 |  | 108,748,000 |  |  |  |
Allowance for Credit Losses | $ (29,000) | $ (30,000) | $ (31,000) |  | $ (31,000) | $ (33,000) | $ (26,000)
[1] | Derived from audited consolidated financial statements.

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