Loans and Allowance for Credit Losses for Loans - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non covered loans net of unearned discount and deferred loan fees	$ 78,500,000	$ 95,800,000
Accrued interest	83,700,000	90,200,000
Loans transferred to loans held for sale	0	30,020,000	$ 1,234,022,000
Sales of loans	0	0
Loans	34,153,657,000	32,217,112,000
Net loans	33,794,455,000	31,876,869,000
Allowance for loan losses	$ 359,202,000	340,243,000	161,759,000
Combined loan-to-value ratio home equity loan	80.00%
Accrued interest on non-accrual loans	$ 7,100,000	6,200,000	2,500,000
Number of consecutive months for performing restructured loans to be put on accrual status	6 months
TDRs not reported as non-accrual loans	$ 71,300,000	57,400,000
Non-performing TDRs	117,200,000	92,800,000
Specific reserves for loan losses	29,100,000	21,100,000
Loan charge-offs related to loans modified as TDRs	6,000,000	7,700,000
Amount from modified loans	28,000,000	361,000,000
Commitments under unused lines of credit—credit card
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unsecured loans	12,800,000	8,800,000
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans transferred to loans held for sale		30,000,000
Loans	4,545,064,000	4,183,743,000
Allowance for loan losses	25,120,000	28,873,000	5,060,000
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unsecured loans	1,000,000,000	2,700,000,000
Loans	5,847,551,000	6,861,708,000
Allowance for loan losses	103,090,000	131,070,000	104,059,000
Commercial and industrial | Tax Medallion
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net loans	86,000,000
Allowance for loan losses	58,500,000
Commercial and industrial | Commercial and industrial PPP loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	435,950,000	2,152,139,000
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unsecured loans	54,000,000	49,400,000
Loans	2,970,976,000	2,700,838,000
Allowance for loan losses	$ 13,502,000	$ 16,187,000	$ 6,967,000