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Supplementary Regulatory Capital Disclosure (Details)
$ in Millions
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Debt Disclosure [Abstract]    
Total capital to risk-weighted assets, actual amount $ 849.3 $ 813.1
Total capital to risk-weighted assets, actual, ratio 0.1377 0.1594
Total capital to risk-weighted assets, minimum for capital adequacy purposes amount $ 493.4 $ 408.1
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 $ 616.8 $ 510.1
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 $ 795.5 $ 764.3
Tier 1 capital to average assets, actual, ratio 0.0913 0.0904
Tier 1 capital to average assets, minimum for capital adequacy purposes amount $ 348.7 $ 338.0
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 $ 435.9 $ 422.5
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 $ 795.5 $ 764.3
Common equity to risk-weighted assets, actual, ratio 0.1290 0.1498
Common equity to risk-weighted assets, minimum for capital adequacy purposes amount $ 277.5 $ 229.5
Common equity to risk-weighted assets, minimum for capital adequacy purposes, ratio 0.0450 0.0450
Common equity to risk-weighted assets, minimum to be well capitalized under prompt corrective action provisions amount $ 400.9 $ 331.6
Common equity to risk-weighted assets, minimum to be well capitalized under Prompt corrective action provisions, ratio 0.0650 0.0650
Tier 1 capital to risk-weighted assets, actual amount $ 795.5 $ 764.3
Tier 1 capital to risk-weighted assets, actual, ratio 0.1290 0.1498
Tier 1 capital to risk-weighted assets, minimum for capital adequacy purposes amount $ 370.1 $ 306.1
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 $ 493.4 $ 408.1
Tier 1 capital to risk-weighted assets, minimum to be well capitalized under prompt corrective action provisions, ratio 0.0800 0.0800