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, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for credit losses	$ 59,630	$ 86,594
Collectively evaluated for credit losses	377,268	372,061
Total	436,898	458,655	$ 362,510	$ 359,202
Individually evaluated for credit losses	238,474	374,093
Collectively evaluated for credit losses	48,421,492	46,543,107
Total	48,659,966	46,917,200
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for credit losses	46,151	68,745
Collectively evaluated for credit losses	81,841	71,196
Total	127,992	139,941	101,203	103,090
Individually evaluated for credit losses	74,625	117,644
Collectively evaluated for credit losses	8,969,321	8,687,186
Total	9,043,946	8,804,830
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for credit losses	13,445	13,174
Collectively evaluated for credit losses	229,887	246,234
Total	243,332	259,408	219,949	217,490
Individually evaluated for credit losses	144,892	213,522
Collectively evaluated for credit losses	30,632,186	29,219,346
Total	30,777,078	29,432,868
Residential Mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for credit losses	34	337
Collectively evaluated for credit losses	41,674	38,683
Total	41,708	39,020	28,189	25,120
Individually evaluated for credit losses	12,028	28,869
Collectively evaluated for credit losses	5,474,252	5,335,681
Total	5,486,280	5,364,550
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for credit losses	0	4,338
Collectively evaluated for credit losses	23,866	15,948
Total	23,866	20,286	$ 13,169	$ 13,502
Individually evaluated for credit losses	6,929	14,058
Collectively evaluated for credit losses	3,345,733	3,300,894
Total	$ 3,352,662	$ 3,314,952