Minimum Regulatory Capital Requirements - Additional Information (Detail)	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
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%
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%	25.00%
Common Equity Tier 1 Capital [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Capital conservation buffer				2.50%