Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) shares in Thousands, $ in Thousands	1 Months Ended		12 Months Ended
	Aug. 31, 2017	Jun. 30, 2015	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Summary Of Significant Accounting Policies [Line Items]
Transfer of loans to loans held for sale			$ 10,000
Forecast period			2 years
Historical loss experience period			1 year
Properties for which formal foreclosure proceedings are in process			$ 1,600	$ 2,600
Award vesting period			1 year
Anti-dilutive common stock options and warrants (in shares)			2,400	188	0
Allowance for loan losses			$ 446,080	$ 458,655	$ 359,202
Adjustment due to adoption of ASUs			6,701,391	6,400,802	5,084,066	$ 4,592,120
Retained Earnings
Summary Of Significant Accounting Policies [Line Items]
Adjustment due to adoption of ASUs			$ 1,471,371	1,218,445	$ 883,645	611,158
Cumulative Effect, Period of Adoption, Adjustment
Summary Of Significant Accounting Policies [Line Items]
Allowance for loan losses				(1,368)
Adjustment due to adoption of ASUs				990
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
Summary Of Significant Accounting Policies [Line Items]
Adjustment due to adoption of ASUs				990		$ (47,300)
Revision of Prior Period, Accounting Standards Update, Adjustment
Summary Of Significant Accounting Policies [Line Items]
Allowance for loan losses				$ 1,400
Noncumulative Preferred Stock
Summary Of Significant Accounting Policies [Line Items]
Common stock issued (in shares)	4,000	4,600
Residential mortgage and home equity
Summary Of Significant Accounting Policies [Line Items]
Number of days past due of loans to be full or partial charged-off			120 days
Automobile
Summary Of Significant Accounting Policies [Line Items]
Number of days past due of loans to be fully charged-off			120 days
Unsecured loans at banks
Summary Of Significant Accounting Policies [Line Items]
Number of days past due of loans to be fully charged-off			150 days
Minimum
Summary Of Significant Accounting Policies [Line Items]
Premises and equipment, useful life			3 years
Minimum | Commitments under commercial loans and lines of credit
Summary Of Significant Accounting Policies [Line Items]
Number of days past due of loans to be full or partial charged-off			90 days
Maximum
Summary Of Significant Accounting Policies [Line Items]
Premises and equipment, useful life			40 years
Maximum | Commitments under commercial loans and lines of credit
Summary Of Significant Accounting Policies [Line Items]
Number of days past due of loans to be full or partial charged-off			120 days