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Minimum Regulatory Capital Requirements - Additional Information (Detail)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
USD ($)
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]      
Minimum leverage ratio calculated as ratio of Tier 1 capital to average quarterly assets     9.00%
Banking regulation capital transitional amount     $ 8.1
Banking regulation capital transitional amount substracted     $ 2.0
Leverage ratio     0.10
Capital ratio     0.13
CECL Adjustment to Regulatory Capital [Member]      
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]      
Adjustment to regulatory capital     25.00%
Forecast [Member] | CECL Adjustment to Regulatory Capital [Member]      
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]      
Adjustment to regulatory capital 25.00% 50.00%  
Common Equity Tier 1 Capital [Member]      
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]      
Capital conservation buffer     2.50%