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Supplementary Regulatory Capital Disclosure (Details) $ in Millions | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
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Debt Disclosure [Abstract] |  |
Total capital to risk-weighted assets, actual amount | $ 719.2 | $ 727.2
Total capital to risk-weighted assets, actual, ratio | 0.1415 | 0.1627
Total capital to risk-weighted assets, minimum for capital adequacy purposes amount | $ 406.7 | $ 357.5
Total capital to risk-weighted assets, minimum for capital adequacy purposes, ratio | 0.0800 | 0.0800
Total capital to risk-weighted assets, minimum to be well capitalized under prompt corrective action provisions amount | $ 508.4 | $ 446.9
Total capital to risk-weighted assets, minimum to be well capitalized under prompt corrective action provisions, ratio | 0.1000 | 0.1000
Tier 1 capital to average assets, actual amount | $ 665.9 | $ 675.2
Tier 1 capital to average assets, actual, ratio | 0.0963 | 0.1021
Tier 1 capital to average assets, minimum for capital adequacy purposes amount | $ 276.5 | $ 264.4
Tier 1 capital to average assets, minimum for capital adequacy purposes, ratio | 0.0400 | 0.0400
Tier 1 capital to average assets, minimum to be well capitalized under prompt corrective action provisions amount | $ 345.7 | $ 330.5
Tier 1 capital to average assets, minimum to be well capitalized under prompt corrective action provision, ratio | 0.0500 | 0.0500
Common equity to risk-weighted assets, actual amount | $ 665.9 | $ 675.2
Common equity to risk-weighted assets, actual, ratio | 13.10% | 15.11%
Common equity to risk-weighted assets, minimum for capital adequacy purposes amount | $ 228.8 | $ 201.1
Common equity to risk-weighted assets, minimum for capital adequacy purposes, ratio | 4.50% | 4.50%
Common equity to risk-weighted assets, minimum to be well capitalized under prompt corrective action provisions amount | $ 330.4 | $ 290.5
Common equity to risk-weighted assets, minimum to be well capitalized under Prompt corrective action provisions, ratio | 6.50% | 6.50%
Tier 1 capital to risk-weighted assets, actual amount | $ 665.9 | $ 675.2
Tier 1 capital to risk-weighted assets, actual, ratio | 0.1310 | 0.1511
Tier 1 capital to risk-weighted assets, minimum for capital adequacy purposes amount | $ 305.0 | $ 268.1
Tier 1 capital to risk-weighted assets, minimum for capital adequacy purposes, ratio | 0.0600 | 0.0600
Tier 1 capital to risk-weighted assets, minimum to be well capitalized under prompt corrective action provisions amount | $ 406.7 | $ 357.5
Tier 1 capital to risk-weighted assets, minimum to be well capitalized under prompt corrective action provisions, ratio | 0.0800 | 0.0800

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