Loans, Loans by Past Due Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 29,768,586	$ 29,216,218
Financing Receivable, Nonaccrual	123,260	148,997
Nonaccrual Loans, Current Portion	$ 52,000	$ 80,000
Percent of current nonaccrual loans	42.00%	53.00%
Financing Receivable, Nonaccrual, Interest Income	$ 0	$ 0
Financing Receivable, Nonaccrual, No Allowance	24,000	23,000
Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	29,565,335	28,983,708
Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	40,961	38,113
Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	35,841	23,712
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	3,189	21,689
Commercial and Industrial Sector [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	10,573,741	9,731,555
Financing Receivable, Nonaccrual	19,084	62,022
Commercial and Industrial Sector [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	10,552,756	9,663,587
Commercial and Industrial Sector [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	899	5,374
Commercial and Industrial Sector [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	361	191
Commercial and Industrial Sector [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	642	380
Commercial Real Estate Owner Occupied Portfolio [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,143,741	1,061,700
Financing Receivable, Nonaccrual	1,501	1,394
Commercial Real Estate Owner Occupied Portfolio [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,140,607	1,059,948
Commercial Real Estate Owner Occupied Portfolio [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,533	0
Commercial Real Estate Owner Occupied Portfolio [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	101	358
Commercial Real Estate Owner Occupied Portfolio [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Commercial And Business Lending [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	11,717,483	10,793,255
Financing Receivable, Nonaccrual	20,585	63,416
Commercial And Business Lending [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	11,693,363	10,723,536
Commercial And Business Lending [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,432	5,374
Commercial And Business Lending [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	462	549
Commercial And Business Lending [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	642	380
Commercial Real Estate Investor Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,227,975	5,124,245
Financing Receivable, Nonaccrual	16,705	0
Commercial Real Estate Investor Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,174,879	5,086,117
Commercial Real Estate Investor Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,117	0
Commercial Real Estate Investor Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	31,274	18,697
Commercial Real Estate Investor Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	19,432
Construction Loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,982,632	2,271,398
Financing Receivable, Nonaccrual	30	6
Construction Loans [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,982,581	2,271,392
Construction Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	21	0
Construction Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Construction Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	7,210,607	7,395,644
Financing Receivable, Nonaccrual	16,735	6
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	7,157,460	7,357,509
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	5,138	0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	31,274	18,697
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	19,432
Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	18,928,090	18,188,898
Financing Receivable, Nonaccrual	37,320	63,422
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	18,850,823	18,081,044
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	7,570	5,374
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	31,736	19,246
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	642	19,812
Residential Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	7,047,541	7,864,891
Financing Receivable, Nonaccrual	70,038	71,142
Residential Mortgage [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	6,962,610	7,780,304
Residential Mortgage [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	14,731	13,294
Residential Mortgage [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	162	152
Residential Mortgage [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Automobile Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,810,220	2,256,162
Financing Receivable, Nonaccrual	7,402	5,797
Automobile Loan [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,787,967	2,232,906
Automobile Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	12,588	14,712
Automobile Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,262	2,674
Automobile Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	73
Home Equity Line of Credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	664,252	628,526
Financing Receivable, Nonaccrual	8,378	8,508
Home Equity Line of Credit [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	651,248	615,810
Home Equity Line of Credit [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,181	3,500
Home Equity Line of Credit [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	445	708
Home Equity Line of Credit [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	0	0
Other Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	318,483	277,740
Financing Receivable, Nonaccrual	122	128
Other Consumer [Member] | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	312,687	273,644
Other Consumer [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,892	1,233
Other Consumer [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	1,236	932
Other Consumer [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	2,547	1,803
Total consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	10,840,496	11,027,319
Financing Receivable, Nonaccrual	85,941	85,574
Total consumer | Financial Asset, Not Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	10,714,512	10,902,664
Total consumer | Financial Asset, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	33,391	32,739
Total consumer | Financial Asset, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	4,105	4,467
Total consumer | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans and Leases Receivable, Net of Deferred Income	$ 2,547	$ 1,876