Loans Past Due Status (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Summarized details of Loans
Current	$ 29,426,541	$ 29,426,541	$ 28,983,708
Financing Receivable, Nonaccrual	154,423	154,423	148,997
Loans and Leases Receivable, Net of Deferred Income, Total	29,618,271	29,618,271	29,216,218
Nonaccrual Loans, Current Portion	$ 63,000	$ 63,000	$ 80,000
Percent of current nonaccrual loans	41.00%	41.00%	53.00%
Financing Receivable, Nonaccrual, Interest Income	$ 0	$ 0	$ 0
Financing Receivable, Nonaccrual, No Allowance	13,000	13,000	23,000
30-59 Days Past Due
Summarized details of Loans
Total Past Due	30,587	30,587	38,113
60-89 Days Past Due
Summarized details of Loans
Total Past Due	4,365	4,365	23,712
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	2,354	2,354	21,689
Commercial and Industrial Sector
Summarized details of Loans
Current	9,946,786	9,946,786	9,663,587
Financing Receivable, Nonaccrual	21,190	21,190	62,022
Loans and Leases Receivable, Net of Deferred Income, Total	9,970,412	9,970,412	9,731,555
Commercial and Industrial Sector | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	1,830	1,830	5,374
Commercial and Industrial Sector | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	222	222	191
Commercial and Industrial Sector | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	384	384	380
Commercial real estate — owner occupied
Summarized details of Loans
Current	1,100,295	1,100,295	1,059,948
Financing Receivable, Nonaccrual	1,851	1,851	1,394
Loans and Leases Receivable, Net of Deferred Income, Total	1,102,146	1,102,146	1,061,700
Commercial real estate — owner occupied | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	0	0	0
Commercial real estate — owner occupied | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	0	358
Commercial real estate — owner occupied | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	0	0	0
Commercial and business lending
Summarized details of Loans
Current	11,047,081	11,047,081	10,723,536
Financing Receivable, Nonaccrual	23,041	23,041	63,416
Loans and Leases Receivable, Net of Deferred Income, Total	11,072,558	11,072,558	10,793,255
Commercial and business lending | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	1,830	1,830	5,374
Commercial and business lending | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	222	222	549
Commercial and business lending | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	384	384	380
Commercial real estate — investor
Summarized details of Loans
Current	4,952,120	4,952,120	5,086,117
Financing Receivable, Nonaccrual	48,249	48,249	0
Loans and Leases Receivable, Net of Deferred Income, Total	5,001,392	5,001,392	5,124,245
Commercial real estate — investor | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	1,023	1,023	0
Commercial real estate — investor | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	0	18,697
Commercial real estate — investor | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	0	0	19,432
Real estate construction
Summarized details of Loans
Current	2,255,621	2,255,621	2,271,392
Financing Receivable, Nonaccrual	16	16	6
Loans and Leases Receivable, Net of Deferred Income, Total	2,255,637	2,255,637	2,271,398
Real estate construction | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	0	0	0
Real estate construction | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	0	0
Real estate construction | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	0	0	0
Commercial real estate lending
Summarized details of Loans
Current	7,207,741	7,207,741	7,357,509
Financing Receivable, Nonaccrual	48,265	48,265	6
Loans and Leases Receivable, Net of Deferred Income, Total	7,257,029	7,257,029	7,395,644
Commercial real estate lending | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	1,023	1,023	0
Commercial real estate lending | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	0	18,697
Commercial real estate lending | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	0	0	19,432
Total commercial
Summarized details of Loans
Current	18,254,821	18,254,821	18,081,044
Financing Receivable, Nonaccrual	71,306	71,306	63,422
Loans and Leases Receivable, Net of Deferred Income, Total	18,329,587	18,329,587	18,188,898
Total commercial | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	2,853	2,853	5,374
Total commercial | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	222	222	19,246
Total commercial | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	384	384	19,812
Residential mortgage
Summarized details of Loans
Current	7,761,641	7,761,641	7,780,304
Financing Receivable, Nonaccrual	68,058	68,058	71,142
Loans and Leases Receivable, Net of Deferred Income, Total	7,840,073	7,840,073	7,864,891
Residential mortgage | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	10,087	10,087	13,294
Residential mortgage | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	287	287	152
Residential mortgage | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	0	0	0
Automobile Loan
Summarized details of Loans
Current	2,533,170	2,533,170	2,232,906
Financing Receivable, Nonaccrual	6,986	6,986	5,797
Loans and Leases Receivable, Net of Deferred Income, Total	2,556,009	2,556,009	2,256,162
Automobile Loan | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	13,796	13,796	14,712
Automobile Loan | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	2,018	2,018	2,674
Automobile Loan | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	39	39	73
Home equity
Summarized details of Loans
Current	622,452	622,452	615,810
Financing Receivable, Nonaccrual	7,996	7,996	8,508
Loans and Leases Receivable, Net of Deferred Income, Total	634,142	634,142	628,526
Home equity | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	2,677	2,677	3,500
Home equity | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	1,018	1,018	708
Home equity | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	0	0	0
Other consumer
Summarized details of Loans
Current	254,457	254,457	273,644
Financing Receivable, Nonaccrual	77	77	128
Loans and Leases Receivable, Net of Deferred Income, Total	258,460	258,460	277,740
Other consumer | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	1,175	1,175	1,233
Other consumer | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	820	820	932
Other consumer | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	1,931	1,931	1,803
Total consumer
Summarized details of Loans
Current	11,171,720	11,171,720	10,902,664
Financing Receivable, Nonaccrual	83,117	83,117	85,574
Loans and Leases Receivable, Net of Deferred Income, Total	11,288,684	11,288,684	11,027,319
Total consumer | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	27,735	27,735	32,739
Total consumer | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	4,143	4,143	4,467
Total consumer | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Summarized details of Loans
Total Past Due	$ 1,970	$ 1,970	$ 1,876