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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	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Impaired Loans and Leases
Individually evaluated, allowance for loan and lease losses	$ 73,080		$ 79,416
Collectively evaluated, allowance for loan and lease losses	165,109		173,423
Total allowance for loan and lease losses	238,189	$ 244,377	252,839	$ 126,725	$ 124,145	$ 125,083
Individually evaluated, loans and leases	409,526		354,143
Collectively evaluated, loans and leases	17,412,692		17,675,409
Total	17,822,218		18,029,552
Commercial Real Estate
Impaired Loans and Leases
Individually evaluated, allowance for loan and lease losses	44,622		47,329
Collectively evaluated, allowance for loan and lease losses	102,463		95,062
Total allowance for loan and lease losses	147,085	150,434	142,391	73,115	73,999	74,171
Individually evaluated, loans and leases	310,412		240,753
Collectively evaluated, loans and leases	9,573,727		9,771,341
Total	9,884,139		10,012,094
Commercial
Impaired Loans and Leases
Individually evaluated, allowance for loan and lease losses	28,458		31,909
Collectively evaluated, allowance for loan and lease losses	53,363		54,581
Total allowance for loan and lease losses	81,821	84,297	86,490	46,469	43,356	44,169
Individually evaluated, loans and leases	99,114		111,589
Collectively evaluated, loans and leases	3,882,689		3,835,774
Total	3,981,803		3,947,363
Consumer
Impaired Loans and Leases
Individually evaluated, allowance for loan and lease losses	0		178
Collectively evaluated, allowance for loan and lease losses	9,283		23,780
Total allowance for loan and lease losses	9,283	$ 9,646	23,958	$ 7,141	$ 6,790	$ 6,743
Individually evaluated, loans and leases	0		1,801
Collectively evaluated, loans and leases	3,956,276		4,068,294
Total	$ 3,956,276		$ 4,070,095