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, 2022	Dec. 31, 2021	Dec. 31, 2020
Allowance for loan losses:
Individually evaluated for credit losses	$ 86,594	$ 71,496
Collectively evaluated for credit losses	372,061	287,706
Total	458,655	359,202	$ 340,243
Loans:
Individually evaluated for credit losses	374,093	298,795
Collectively evaluated for credit losses	46,543,107	33,854,862
Total	46,917,200	34,153,657
Commercial and industrial
Allowance for loan losses:
Individually evaluated for credit losses	68,745	64,359
Collectively evaluated for credit losses	71,196	38,731
Total	139,941	103,090	131,070
Loans:
Individually evaluated for credit losses	117,644	119,760
Collectively evaluated for credit losses	8,687,186	5,727,791
Total	8,804,830	5,847,551
Commercial real estate
Allowance for loan losses:
Individually evaluated for credit losses	13,174	6,277
Collectively evaluated for credit losses	246,234	211,213
Total	259,408	217,490	164,113
Loans:
Individually evaluated for credit losses	213,522	134,135
Collectively evaluated for credit losses	29,219,346	20,655,931
Total	29,432,868	20,790,066
Residential Mortgage
Allowance for loan losses:
Individually evaluated for credit losses	337	470
Collectively evaluated for credit losses	38,683	24,650
Total	39,020	25,120	28,873
Loans:
Individually evaluated for credit losses	28,869	42,469
Collectively evaluated for credit losses	5,335,681	4,502,595
Total	5,364,550	4,545,064
Home equity
Allowance for loan losses:
Individually evaluated for credit losses	4,338	390
Collectively evaluated for credit losses	15,948	13,112
Total	20,286	13,502	$ 16,187
Loans:
Individually evaluated for credit losses	14,058	2,431
Collectively evaluated for credit losses	3,300,894	2,968,545
Total	$ 3,314,952	$ 2,970,976