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, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for credit losses	$ 61,445	$ 75,855
Collectively evaluated for credit losses	516,755	482,995
Total	578,200	558,850	$ 469,248	$ 446,080
Individually evaluated for credit losses	296,000	329,702
Collectively evaluated for credit losses	48,361,128	48,470,009
Total	48,657,128	48,799,711
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for credit losses	52,745	59,603
Collectively evaluated for credit losses	131,955	113,399
Total	184,700	173,002	138,593	133,359
Individually evaluated for credit losses	102,046	131,898
Collectively evaluated for credit losses	10,048,159	9,799,502
Total	10,150,205	9,931,400
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for credit losses	8,674	16,225
Collectively evaluated for credit losses	312,988	287,923
Total	321,662	304,148	265,847	249,598
Individually evaluated for credit losses	167,725	172,666
Collectively evaluated for credit losses	28,946,831	29,472,292
Total	29,114,556	29,644,958
Residential Mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for credit losses	26	27
Collectively evaluated for credit losses	48,880	58,868
Total	48,906	58,895	44,377	42,957
Individually evaluated for credit losses	24,897	23,797
Collectively evaluated for credit losses	5,611,510	5,608,719
Total	5,636,407	5,632,516
Consumer loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Individually evaluated for credit losses	0	0
Collectively evaluated for credit losses	22,932	22,805
Total	22,932	22,805	$ 20,431	$ 20,166
Individually evaluated for credit losses	1,332	1,341
Collectively evaluated for credit losses	3,754,628	3,589,496
Total	$ 3,755,960	$ 3,590,837