Allowance for Credit Losses - Schedule of the Impaired and Non-Impaired Loans and Leases, By Loan and Leases Class (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Impaired Loans and Leases
Individually evaluated, allowance for loan and lease losses	$ 78,896	$ 79,416
Collectively evaluated, allowance for loan and lease losses	165,481	173,423
Total allowance for loan and lease losses	244,377	252,839	$ 124,145	$ 125,083
Individually evaluated, loans and leases	392,396	354,143
Collectively evaluated, loans and leases	17,531,760	17,675,409
Total	17,924,156	18,029,552
Commercial Real Estate
Impaired Loans and Leases
Individually evaluated, allowance for loan and lease losses	46,852	47,329
Collectively evaluated, allowance for loan and lease losses	103,582	95,062
Total allowance for loan and lease losses	150,434	142,391	73,999	74,171
Individually evaluated, loans and leases	277,911	240,753
Collectively evaluated, loans and leases	9,679,497	9,771,341
Total	9,957,408	10,012,094
Commercial
Impaired Loans and Leases
Individually evaluated, allowance for loan and lease losses	32,044	31,909
Collectively evaluated, allowance for loan and lease losses	52,253	54,581
Total allowance for loan and lease losses	84,297	86,490	43,356	44,169
Individually evaluated, loans and leases	114,485	111,589
Collectively evaluated, loans and leases	3,897,489	3,835,774
Total	4,011,974	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	9,646	23,780
Total allowance for loan and lease losses	9,646	23,958	$ 6,790	$ 6,743
Individually evaluated, loans and leases	0	1,801
Collectively evaluated, loans and leases	3,954,774	4,068,294
Total	$ 3,954,774	$ 4,070,095

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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- Definition

Amount of allowance for credit loss on financing receivable evaluated on collective basis. Excludes financing receivable evaluated on individual basis.

+ References

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-Topic 310
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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-Topic 326
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