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Regulatory matters - Schedule of Bank's Capital Amounts and Ratios (Details) $ in Thousands | Mar. 31, 2026 USD ($) | Dec. 31, 2025 USD ($)
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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 | $ 450,966 | $ 440,852
Common equity Tier 1 capital to risk-weighted assets, Actual Ratio | 10.96 | 11.03
Common equity Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount | $ 185,296 | $ 179,784
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 | $ 460,966 | $ 450,852
Tier 1 capital to risk-weighted assets, Actual Ratio | 11.2 | 11.28
Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount | $ 247,062 | $ 239,712
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 | $ 582,785 | $ 571,887
Total capital to risk-weighted assets, Actual Ratio | 14.16 | 14.31
Total capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount | $ 329,416 | $ 319,617
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 | $ 460,966 | $ 450,852
Tier 1 capital to average assets, Actual Ratio | 9.03 | 8.84
Tier 1 capital to average assets, Minimum For Capital Adequacy Purposes Amount | $ 204,234 | $ 204,039
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 | $ 532,086 | $ 520,587
Common equity Tier 1 capital to risk-weighted assets, Actual Ratio | 12.95 | 13.06
Common equity Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount | $ 184,882 | $ 179,427
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 | $ 267,051 | $ 259,172
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 | $ 532,086 | $ 520,587
Tier 1 capital to risk-weighted assets, Actual Ratio | 12.95 | 13.06
Tier 1 capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount | $ 246,509 | $ 239,236
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 | $ 328,679 | $ 318,981
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 | $ 570,616 | $ 558,435
Total capital to risk-weighted assets, Actual Ratio | 13.89 | 14.01
Total capital to risk-weighted assets, Minimum For Capital Adequacy Purposes Amount | $ 328,679 | $ 318,981
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 | $ 410,848 | $ 398,726
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 | $ 532,086 | $ 520,587
Tier 1 capital to average assets, Actual Ratio | 10.42 | 10.22
Tier 1 capital to average assets, Minimum For Capital Adequacy Purposes Amount | $ 204,233 | $ 203,726
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 | $ 255,292 | $ 254,658
Tier 1 capital to average assets, Minimum to be Well Capitalized under Prompt Corrective Action Provisions Ratio | 5 | 5

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