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Fair Value Measurements - Assets Measured at Fair Value on Recurring and Nonrecurring Basis (Details) - USD ($)	Sep. 30, 2025	Dec. 31, 2024
Fair Value Measurements.
Securities available for sale, fair value	$ 421,627,000	$ 389,243,000
Equity securities	1,000,000	887,000
Agency mortgage-backed securities
Fair Value Measurements.
Securities available for sale, fair value	83,676,000	67,941,000
Agency CMO
Fair Value Measurements.
Securities available for sale, fair value	97,006,000	47,518,000
Agency notes and bonds
Fair Value Measurements.
Securities available for sale, fair value	91,827,000	118,080,000
Treasury notes and bonds
Fair Value Measurements.
Securities available for sale, fair value	5,441,000	21,549,000
Municipal obligations
Fair Value Measurements.
Securities available for sale, fair value	143,677,000	134,155,000
Recurring
Fair Value Measurements.
Securities available for sale, fair value	421,627,000	389,243,000
Equity securities	1,013,000	886,000
Recurring | Level 1
Fair Value Measurements.
Securities available for sale, fair value	5,441,000	21,549,000
Equity securities	1,013,000	886,000
Recurring | Level 2
Fair Value Measurements.
Securities available for sale, fair value	416,186,000	367,694,000
Equity securities	0	0
Recurring | Level 3
Fair Value Measurements.
Securities available for sale, fair value	0	0
Equity securities	0	0
Recurring | Agency mortgage-backed securities
Fair Value Measurements.
Securities available for sale, fair value	83,676,000	67,941,000
Recurring | Agency mortgage-backed securities | Level 1
Fair Value Measurements.
Securities available for sale, fair value	0	0
Recurring | Agency mortgage-backed securities | Level 2
Fair Value Measurements.
Securities available for sale, fair value	83,676,000	67,941,000
Recurring | Agency mortgage-backed securities | Level 3
Fair Value Measurements.
Securities available for sale, fair value	0	0
Recurring | Agency CMO
Fair Value Measurements.
Securities available for sale, fair value	97,006,000	47,518,000
Recurring | Agency CMO | Level 1
Fair Value Measurements.
Securities available for sale, fair value	0	0
Recurring | Agency CMO | Level 2
Fair Value Measurements.
Securities available for sale, fair value	97,006,000	47,518,000
Recurring | Agency CMO | Level 3
Fair Value Measurements.
Securities available for sale, fair value	0	0
Recurring | Agency notes and bonds
Fair Value Measurements.
Securities available for sale, fair value	91,827,000	118,080,000
Recurring | Agency notes and bonds | Level 1
Fair Value Measurements.
Securities available for sale, fair value	0	0
Recurring | Agency notes and bonds | Level 2
Fair Value Measurements.
Securities available for sale, fair value	91,827,000	118,080,000
Recurring | Agency notes and bonds | Level 3
Fair Value Measurements.
Securities available for sale, fair value	0	0
Recurring | Treasury notes and bonds
Fair Value Measurements.
Securities available for sale, fair value	5,441,000	21,549,000
Recurring | Treasury notes and bonds | Level 1
Fair Value Measurements.
Securities available for sale, fair value	5,441,000	21,549,000
Recurring | Treasury notes and bonds | Level 2
Fair Value Measurements.
Securities available for sale, fair value	0	0
Recurring | Treasury notes and bonds | Level 3
Fair Value Measurements.
Securities available for sale, fair value	0	0
Recurring | Municipal obligations
Fair Value Measurements.
Securities available for sale, fair value	143,677,000	134,155,000
Recurring | Municipal obligations | Level 1
Fair Value Measurements.
Securities available for sale, fair value	0	0
Recurring | Municipal obligations | Level 2
Fair Value Measurements.
Securities available for sale, fair value	143,677,000	134,155,000
Recurring | Municipal obligations | Level 3
Fair Value Measurements.
Securities available for sale, fair value	0	0
Nonrecurring
Fair Value Measurements.
Collateral dependent loans	531,000	729,000
Nonrecurring | Commercial Business
Fair Value Measurements.
Collateral dependent loans	494,000	693,000
Nonrecurring | 1-4 Family Residential Construction
Fair Value Measurements.
Collateral dependent loans	37,000	36,000
Nonrecurring | Level 1
Fair Value Measurements.
Collateral dependent loans	0	0
Nonrecurring | Level 1 | Commercial Business
Fair Value Measurements.
Collateral dependent loans	0	0
Nonrecurring | Level 1 | 1-4 Family Residential Construction
Fair Value Measurements.
Collateral dependent loans	0	0
Nonrecurring | Level 2
Fair Value Measurements.
Collateral dependent loans	0	0
Nonrecurring | Level 2 | Commercial Business
Fair Value Measurements.
Collateral dependent loans	0	0
Nonrecurring | Level 2 | 1-4 Family Residential Construction
Fair Value Measurements.
Collateral dependent loans	0	0
Nonrecurring | Level 3
Fair Value Measurements.
Collateral dependent loans	531,000	729,000
Nonrecurring | Level 3 | Commercial Business
Fair Value Measurements.
Collateral dependent loans	494,000	693,000
Nonrecurring | Level 3 | 1-4 Family Residential Construction
Fair Value Measurements.
Collateral dependent loans	$ 37,000	$ 36,000

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