Loans and Allowance for Credit Losses for Loans - Summary of Allocation of Allowance for Loan Losses and Related Loans by Loan Portfolio Segment Disaggregated Based on Allowance Measurement Methodology (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance for loan losses:
Individually evaluated for credit losses	$ 71,496	$ 75,871
Collectively evaluated for credit losses	287,706	264,372
Total	359,202	340,243	$ 161,759
Loans:
Individually evaluated for credit losses	298,795	229,593
Collectively evaluated for credit losses	33,854,862	31,987,519
Total	34,153,657	32,217,112
Commercial and industrial *
Allowance for loan losses:
Individually evaluated for credit losses	64,359	73,063
Collectively evaluated for credit losses	38,731	58,007
Total	103,090	131,070	104,059
Loans:
Individually evaluated for credit losses	119,760	131,057
Collectively evaluated for credit losses	5,727,791	6,730,651
Total	5,847,551	6,861,708
Commercial real estate
Allowance for loan losses:
Individually evaluated for credit losses	6,277	1,338
Collectively evaluated for credit losses	211,213	162,775
Total	217,490	164,113	45,673
Loans:
Individually evaluated for credit losses	134,135	61,754
Collectively evaluated for credit losses	20,655,931	18,409,069
Total	20,790,066	18,470,823
Residential Mortgage
Allowance for loan losses:
Individually evaluated for credit losses	470	1,206
Collectively evaluated for credit losses	24,650	27,667
Total	25,120	28,873	5,060
Loans:
Individually evaluated for credit losses	42,469	35,151
Collectively evaluated for credit losses	4,502,595	4,148,592
Total	4,545,064	4,183,743
Consumer
Allowance for loan losses:
Individually evaluated for credit losses	390	264
Collectively evaluated for credit losses	13,112	15,923
Total	13,502	16,187	$ 6,967
Loans:
Individually evaluated for credit losses	2,431	1,631
Collectively evaluated for credit losses	2,968,545	2,699,207
Total	$ 2,970,976	$ 2,700,838