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Investment Securities - Information concerning investments with unrealized losses (Details) - USD ($) | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
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Available-For-Sale-Securities-And-Held-To-Maturity-Securities |  |  |  |  |  |
Less than 12 months, Fair Value | $ 5,709,000 |  | $ 25,604,000 |  |  |
Less than 12 months, Unrealized Losses | (455,000) |  | (950,000) |  |  |
12 months or longer, Fair Value | 97,934,000 |  | 110,722,000 |  |  |
12 months or longer, Unrealized Losses | (11,597,000) |  | (16,113,000) |  |  |
Total, Fair Value | 103,643,000 |  | 136,326,000 |  |  |
Total, Unrealized Losses | (12,052,000) |  | (17,063,000) |  |  |
Allowance for credit losses | 0 | $ 1,000,000 | 360,000 | $ 360,000 | $ 360,000 | $ 926,000
U.S. Agency |  |  |  |  |  |
Available-For-Sale-Securities-And-Held-To-Maturity-Securities |  |  |  |  |  |
12 months or longer, Fair Value | 4,791,000 |  | 4,666,000 |  |  |
12 months or longer, Unrealized Losses | (416,000) |  | (679,000) |  |  |
Total, Fair Value | 4,791,000 |  | 4,666,000 |  |  |
Total, Unrealized Losses | (416,000) |  | (679,000) |  |  |
U.S. Agency mortgage-backed securities |  |  |  |  |  |
Available-For-Sale-Securities-And-Held-To-Maturity-Securities |  |  |  |  |  |
Less than 12 months, Fair Value | 3,210,000 |  | 16,104,000 |  |  |
Less than 12 months, Unrealized Losses | (6,000) |  | (275,000) |  |  |
12 months or longer, Fair Value | 62,898,000 |  | 63,323,000 |  |  |
12 months or longer, Unrealized Losses | (9,742,000) |  | (12,508,000) |  |  |
Total, Fair Value | 66,108,000 |  | 79,427,000 |  |  |
Total, Unrealized Losses | (9,748,000) |  | (12,783,000) |  |  |
Municipal |  |  |  |  |  |
Available-For-Sale-Securities-And-Held-To-Maturity-Securities |  |  |  |  |  |
12 months or longer, Fair Value | 7,700,000 |  | 8,121,000 |  |  |
12 months or longer, Unrealized Losses | (417,000) |  | (670,000) |  |  |
Total, Fair Value | 7,700,000 |  | 8,121,000 |  |  |
Total, Unrealized Losses | (417,000) |  | (670,000) |  |  |
Corporate bonds |  |  |  |  |  |
Available-For-Sale-Securities-And-Held-To-Maturity-Securities |  |  |  |  |  |
Less than 12 months, Fair Value | 2,499,000 |  | 9,500,000 |  |  |
Less than 12 months, Unrealized Losses | (449,000) |  | (675,000) |  |  |
12 months or longer, Fair Value | 22,545,000 |  | 34,612,000 |  |  |
12 months or longer, Unrealized Losses | (1,022,000) |  | (2,256,000) |  |  |
Total, Fair Value | 25,044,000 |  | 44,112,000 |  |  |
Total, Unrealized Losses | (1,471,000) |  | (2,931,000) |  |  |
Allowance for credit losses |  | $ 1,000,000 | $ 360,000 | $ 360,000 | $ 360,000 | $ 926,000
US Government Agencies Debt Securities and Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise and Municipal Bonds and Corporate bonds |  |  |  |  |  |
Available-For-Sale-Securities-And-Held-To-Maturity-Securities |  |  |  |  |  |
Allowance for credit losses | $ 0 |  |  |  |  |

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