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Regulatory matters - Schedule of Bank's Capital Amounts and Ratios (Details) $ in Thousands | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Company |  |
Common equity Tier 1 capital to risk-weighted assets |  |
Common equity Tier 1 capital to risk-weighted assets, Actual Amount | $ 433,211 | $ 399,461
Common equity Tier 1 capital to risk-weighted assets, Actual Ratio | 11.01 | 10.16
Common equity Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount | $ 177,062 | $ 176,971
Common equity Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Ratio | 4.5 | 4.5
Tier 1 capital to risk-weighted assets |  |
Tier 1 capital to risk-weighted assets, Actual Amount | $ 443,211 | $ 409,461
Tier 1 capital to risk-weighted assets, Actual Ratio | 11.26 | 10.41
Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount | $ 236,169 | $ 235,962
Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Ratio | 6 | 6
Total capital to risk-weighted assets |  |
Total capital to risk-weighted assets, Actual Amount | $ 564,792 | $ 485,117
Total capital to risk-weighted assets, Actual Ratio | 14.35 | 12.34
Total capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount | $ 314,867 | $ 314,616
Total capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Ratio | 8 | 8
Tier 1 capital to average assets |  |
Tier 1 capital to average assets, Actual Amount | $ 443,211 | $ 409,461
Tier 1 capital to average assets, Actual Ratio | 8.87 | 7.97
Tier 1 capital to average assets, Minimum For Capital Adequacy Purposes Amount | $ 199,870 | $ 205,493
Tier 1 capital to average assets, Minimum For Capital Adequacy Purposes Ratio | 4 | 4
Bank |  |
Common equity Tier 1 capital to risk-weighted assets |  |
Common equity Tier 1 capital to risk-weighted assets, Actual Amount | $ 514,266 | $ 429,958
Common equity Tier 1 capital to risk-weighted assets, Actual Ratio | 13.09 | 10.95
Common equity Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount | $ 176,791 | $ 176,640
Common equity Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Ratio | 4.5 | 4.5
Common equity Tier 1 capital to risk-weighted assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Amount | $ 255,365 | $ 255,147
Common equity Tier 1 capital to risk-weighted assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Ratio | 6.5 | 6.5
Tier 1 capital to risk-weighted assets |  |
Tier 1 capital to risk-weighted assets, Actual Amount | $ 514,266 | $ 429,958
Tier 1 capital to risk-weighted assets, Actual Ratio | 13.09 | 10.95
Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount | $ 235,722 | $ 235,520
Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Ratio | 6 | 6
Tier 1 capital to risk-weighted assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Amount | $ 314,295 | $ 314,027
Tier 1 capital to risk-weighted assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Ratio | 8 | 8
Total capital to risk-weighted assets |  |
Total capital to risk-weighted assets, Actual Amount | $ 552,736 | $ 472,614
Total capital to risk-weighted assets, Actual Ratio | 14.07 | 12.04
Total capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount | $ 314,278 | $ 314,027
Total capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Ratio | 8 | 8
Total capital to risk-weighted assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Amount | $ 392,847 | $ 392,534
Total capital to risk-weighted assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Ratio | 10 | 10
Tier 1 capital to average assets |  |
Tier 1 capital to average assets, Actual Amount | $ 514,266 | $ 429,958
Tier 1 capital to average assets, Actual Ratio | 10.31 | 8.37
Tier 1 capital to average assets, Minimum For Capital Adequacy Purposes Amount | $ 199,521 | $ 205,431
Tier 1 capital to average assets, Minimum For Capital Adequacy Purposes Ratio | 4 | 4
Tier 1 capital to average assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Amount | $ 249,402 | $ 256,788
Tier 1 capital to average assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Ratio | 5 | 5

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