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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, 2025	Dec. 31, 2024	Dec. 31, 2023
Allowance for loan losses:
Individually evaluated for credit losses	$ 81,987	$ 75,855
Collectively evaluated for credit losses	501,413	482,995
Total	583,400	558,850	$ 446,080
Loans:
Individually evaluated for credit losses	416,153	329,702
Collectively evaluated for credit losses	49,720,575	48,470,009
Total	50,136,728	48,799,711
Commercial and Industrial
Allowance for loan losses:
Individually evaluated for credit losses	71,188	59,603
Collectively evaluated for credit losses	109,677	113,399
Total	180,865	173,002	133,359
Loans:
Individually evaluated for credit losses	159,594	131,898
Collectively evaluated for credit losses	10,801,925	9,799,502
Total	10,961,519	9,931,400
Commercial real estate
Allowance for loan losses:
Individually evaluated for credit losses	10,777	16,225
Collectively evaluated for credit losses	316,649	287,923
Total	327,426	304,148	249,598
Loans:
Individually evaluated for credit losses	225,982	172,666
Collectively evaluated for credit losses	29,018,000	29,472,292
Total	29,243,982	29,644,958
Residential Mortgage
Allowance for loan losses:
Individually evaluated for credit losses	22	27
Collectively evaluated for credit losses	53,507	58,868
Total	53,529	58,895	42,957
Loans:
Individually evaluated for credit losses	28,569	23,797
Collectively evaluated for credit losses	5,797,623	5,608,719
Total	5,826,192	5,632,516
Consumer
Allowance for loan losses:
Individually evaluated for credit losses	0	0
Collectively evaluated for credit losses	21,580	22,805
Total	21,580	22,805	$ 20,166
Loans:
Individually evaluated for credit losses	2,008	1,341
Collectively evaluated for credit losses	4,103,027	3,589,496
Total	$ 4,105,035	$ 3,590,837

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