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	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for credit losses	$ 105,196		$ 71,496
Collectively evaluated for credit losses	363,623		287,706
Total	468,819	$ 362,510	359,202	$ 339,324	$ 342,880	$ 340,243
Individually evaluated for credit losses	367,806		298,795
Collectively evaluated for credit losses	43,192,971		33,854,862
Total	43,560,777		34,153,657
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for credit losses	93,698		64,359
Collectively evaluated for credit losses	50,841		38,731
Total	144,539	101,203	103,090	109,689	126,408	131,070
Individually evaluated for credit losses	164,235		119,760
Collectively evaluated for credit losses	8,350,223		5,727,791
Total	8,514,458		5,847,551
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for credit losses	10,757		6,277
Collectively evaluated for credit losses	266,470		211,213
Total	277,227	219,949	217,490	189,139	174,236	164,113
Individually evaluated for credit losses	169,737		134,135
Collectively evaluated for credit losses	26,739,722		20,655,931
Total	26,909,459		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	29,248		24,650
Total	29,889	28,189	25,120	25,303	27,172	28,873
Individually evaluated for credit losses	32,303		42,469
Collectively evaluated for credit losses	4,972,766		4,502,595
Total	5,005,069		4,545,064
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for credit losses	100		390
Collectively evaluated for credit losses	17,064		13,112
Total	17,164	$ 13,169	13,502	$ 15,193	$ 15,064	$ 16,187
Individually evaluated for credit losses	1,531		2,431
Collectively evaluated for credit losses	3,130,260		2,968,545
Total	$ 3,131,791		$ 2,970,976