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	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for credit losses	$ 69,623	$ 71,496
Collectively evaluated for credit losses	292,887	287,706
Total	362,510	359,202	$ 342,880	$ 340,243
Individually evaluated for credit losses	268,366	298,795
Collectively evaluated for credit losses	35,096,039	33,854,862
Total	35,364,405	34,153,657
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for credit losses	62,500	64,359
Collectively evaluated for credit losses	38,703	38,731
Total	101,203	103,090	126,408	131,070
Individually evaluated for credit losses	103,534	119,760
Collectively evaluated for credit losses	5,687,856	5,727,791
Total	5,791,390	5,847,551
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for credit losses	6,303	6,277
Collectively evaluated for credit losses	213,646	211,213
Total	219,949	217,490	174,236	164,113
Individually evaluated for credit losses	128,583	134,135
Collectively evaluated for credit losses	21,809,161	20,655,931
Total	21,937,744	20,790,066
Residential Mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for credit losses	641	470
Collectively evaluated for credit losses	27,548	24,650
Total	28,189	25,120	27,172	28,873
Individually evaluated for credit losses	34,696	42,469
Collectively evaluated for credit losses	4,657,239	4,502,595
Total	4,691,935	4,545,064
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for credit losses	179	390
Collectively evaluated for credit losses	12,990	13,112
Total	13,169	13,502	$ 15,064	$ 16,187
Individually evaluated for credit losses	1,553	2,431
Collectively evaluated for credit losses	2,941,783	2,968,545
Total	$ 2,943,336	$ 2,970,976