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Allowance for Credit Losses - Schedule of the Impaired and Non-Impaired Loans and Leases, By Loan and Leases Class (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Impaired Loans and Leases
Individually evaluated, allowance for loan and lease losses	$ 69,442		$ 17,546
Collectively evaluated, allowance for loan and lease losses	184,293		107,537
Total allowance for loan and lease losses	253,735	$ 126,725	125,083	$ 127,316	$ 121,750	$ 117,522
Individually evaluated, loans and leases	394,111		128,428
Collectively evaluated, loans and leases	17,847,796		9,650,860
Total	18,241,907		9,779,288
Commercial Real Estate
Impaired Loans and Leases
Individually evaluated, allowance for loan and lease losses	41,210		3,566
Collectively evaluated, allowance for loan and lease losses	106,690		70,605
Total allowance for loan and lease losses	147,900	73,115	74,171	75,181	82,152	81,410
Individually evaluated, loans and leases	265,178		77,983
Collectively evaluated, loans and leases	9,946,894		5,638,131
Total	10,212,072		5,716,114
Commercial
Impaired Loans and Leases
Individually evaluated, allowance for loan and lease losses	28,049		13,967
Collectively evaluated, allowance for loan and lease losses	52,126		30,202
Total allowance for loan and lease losses	80,175	46,469	44,169	46,221	33,386	29,557
Individually evaluated, loans and leases	126,783		47,819
Collectively evaluated, loans and leases	3,806,929		2,458,845
Total	3,933,712		2,506,664
Consumer
Impaired Loans and Leases
Individually evaluated, allowance for loan and lease losses	183		13
Collectively evaluated, allowance for loan and lease losses	25,477		6,730
Total allowance for loan and lease losses	25,660	$ 7,141	6,743	$ 5,914	$ 6,212	$ 6,555
Individually evaluated, loans and leases	2,150		2,626
Collectively evaluated, loans and leases	4,093,973		1,553,884
Total	$ 4,096,123		$ 1,556,510