Minimum Regulatory Capital Requirements - Additional Information (Detail)	Dec. 31, 2023	Jan. 01, 2019
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Minimum ratio of capital to risk-weighted assets	0.0800	0.080
Minimum ratio of capital to risk-weighted assets including capital conservation buffer		10.50%
Minimum leverage ratio calculated as ratio of Tier 1 capital to average quarterly assets	0.0786	0.040
Common Equity Tier 1 Capital [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Minimum ratio of capital to risk-weighted assets		0.045
Capital conservation buffer		2.50%
Minimum ratio of capital to risk-weighted assets including capital conservation buffer		7.00%
Tier 1 Capital [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Minimum ratio of capital to risk-weighted assets		0.060
Minimum ratio of capital to risk-weighted assets including capital conservation buffer		8.50%