v3.25.4
Summary of Significant Accounting Policies - Summary of Bank's Actual Capital Amounts and Ratios, and the Regulatory Minimum Ratios (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Accounting Policies [Abstract]    
Regulatory, Minimum, Leverage ratio [1] 0.04  
Regulatory, Minimum, Common equity tier 1 capital ratio [2] 4.50%  
Regulatory, Minimum, tier 1 Buffer capital ratio [3] 6.00%  
Regulatory, Minimum, Total capital ratio [3] 0.08  
Regulatory, Well-Capitalized, Leverage ratio [1] 0.05  
Regulatory, Well-Capitalized, Common equity tier 1 capital ratio [2] 6.50%  
Regulatory, Well-Capitalized, tier 1 capital ratio [3] 0.08  
Regulatory, Well-Capitalized, Total capital ratio [3] 0.10  
Common equity tier 1 capital $ 356,038 $ 322,229
Tier 1 capital 455,467 391,016
Total capital 487,292 422,139
Average assets 2,558,754 2,493,857
Risk-weighted assets $ 2,472,328 $ 2,429,349
Leverage ratio [1] 0.178 0.157
Common equity tier 1 capital ratio [2] 0.144 0.133
Tier 1 capital ratio [3] 0.184 0.161
Total capital ratio [3] 0.197 0.174
[1] Calculated by dividing Tier 1 capital by average assets.
[2] Calculated by subtracting preferred stock or non-controlling interest from Tier 1 capital and dividing by risk-weighted assets.
[3] Calculated by dividing Tier 1 or total capital by risk-weighted assets.