Loans Past Due Status (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2022	Dec. 31, 2021
Summarized details of Loans
Current	$ 27,679,004	$ 27,679,004	$ 24,077,931
Nonaccrual(a)(b)	116,406	116,406	130,443
Loans and Leases Receivable, Net of Deferred Income, Total	27,817,280	27,817,280	24,224,949
Nonaccrual Loans, Current Portion	$ 72,000	$ 72,000	$ 84,000
Percent of current nonaccrual loans	62.00%	62.00%	65.00%
Financing Receivable, Nonaccrual, Interest Income	$ 0	$ 0	$ 0
Financing Receivable, Nonaccrual, No Allowance	21,000	21,000	9,000
30-59 Days Past Due
Summarized details of Loans
Total Past Due	18,032	18,032	12,754
60-89 Days Past Due
Summarized details of Loans
Total Past Due	2,421	2,421	2,558
90+ Days Past Due
Summarized details of Loans
Total Past Due	1,417	1,417	1,263
PPP
Summarized details of Loans
Current	798	798	65,941
Nonaccrual(a)(b)	0	0	46
Loans and Leases Receivable, Net of Deferred Income, Total	1,050	1,050	66,070
PPP | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	231	231	40
PPP | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	21	21	43
PPP | 90+ Days Past Due
Summarized details of Loans
Total Past Due	0	0	0
Asset-based lending & equipment finance(a)
Summarized details of Loans
Current	380,830	380,830	178,027
Nonaccrual(a)(b)	0	0	0
Loans and Leases Receivable, Net of Deferred Income, Total	380,830	380,830	178,027
Asset-based lending & equipment finance(a) | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	0	0	0
Asset-based lending & equipment finance(a) | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	0	0
Asset-based lending & equipment finance(a) | 90+ Days Past Due
Summarized details of Loans
Total Past Due	0	0	0
Commercial and Industrial Sector
Summarized details of Loans
Current	9,172,739	9,172,739	8,201,272
Nonaccrual(a)(b)	15,576	15,576	6,233
Loans and Leases Receivable, Net of Deferred Income, Total	9,190,045	9,190,045	8,208,289
Commercial and Industrial Sector | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	1,505	1,505	579
Commercial and Industrial Sector | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	104	104	54
Commercial and Industrial Sector | 90+ Days Past Due
Summarized details of Loans
Total Past Due	121	121	151
Commercial real estate — owner occupied
Summarized details of Loans
Current	999,786	999,786	971,163
Nonaccrual(a)(b)	0	0	0
Loans and Leases Receivable, Net of Deferred Income, Total	999,786	999,786	971,326
Commercial real estate — owner occupied | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	0	0	163
Commercial real estate — owner occupied | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	0	0
Commercial real estate — owner occupied | 90+ Days Past Due
Summarized details of Loans
Total Past Due	0	0	0
Commercial and business lending
Summarized details of Loans
Current	10,554,153	10,554,153	9,416,403
Nonaccrual(a)(b)	15,576	15,576	6,279
Loans and Leases Receivable, Net of Deferred Income, Total	10,571,711	10,571,711	9,423,711
Commercial and business lending | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	1,736	1,736	781
Commercial and business lending | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	124	124	97
Commercial and business lending | 90+ Days Past Due
Summarized details of Loans
Total Past Due	121	121	151
Commercial real estate — investor
Summarized details of Loans
Current	5,026,810	5,026,810	4,323,276
Nonaccrual(a)(b)	37,479	37,479	60,677
Loans and Leases Receivable, Net of Deferred Income, Total	5,064,289	5,064,289	4,384,569
Commercial real estate — investor | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	0	0	142
Commercial real estate — investor | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	0	474
Commercial real estate — investor | 90+ Days Past Due
Summarized details of Loans
Total Past Due	0	0	0
Real estate construction
Summarized details of Loans
Current	1,834,975	1,834,975	1,807,178
Nonaccrual(a)(b)	141	141	177
Loans and Leases Receivable, Net of Deferred Income, Total	1,835,159	1,835,159	1,808,976
Real estate construction | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	43	43	1,618
Real estate construction | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	0	2
Real estate construction | 90+ Days Past Due
Summarized details of Loans
Total Past Due	0	0	0
Commercial real estate lending
Summarized details of Loans
Current	6,861,786	6,861,786	6,130,454
Nonaccrual(a)(b)	37,620	37,620	60,855
Loans and Leases Receivable, Net of Deferred Income, Total	6,899,449	6,899,449	6,193,545
Commercial real estate lending | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	43	43	1,759
Commercial real estate lending | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	0	0	477
Commercial real estate lending | 90+ Days Past Due
Summarized details of Loans
Total Past Due	0	0	0
Total commercial
Summarized details of Loans
Current	17,415,939	17,415,939	15,546,857
Nonaccrual(a)(b)	53,196	53,196	67,134
Loans and Leases Receivable, Net of Deferred Income, Total	17,471,159	17,471,159	15,617,256
Total commercial | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	1,779	1,779	2,541
Total commercial | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	124	124	573
Total commercial | 90+ Days Past Due
Summarized details of Loans
Total Past Due	121	121	151
Residential mortgage
Summarized details of Loans
Current	8,252,714	8,252,714	7,505,654
Nonaccrual(a)(b)	55,485	55,485	55,362
Loans and Leases Receivable, Net of Deferred Income, Total	8,314,902	8,314,902	7,567,310
Residential mortgage | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	6,371	6,371	5,500
Residential mortgage | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	146	146	669
Residential mortgage | 90+ Days Past Due
Summarized details of Loans
Total Past Due	186	186	126
Auto finance
Summarized details of Loans
Current	1,110,628	1,110,628	142,982
Nonaccrual(a)(b)	302	302	52
Loans and Leases Receivable, Net of Deferred Income, Total	1,117,136	1,117,136	143,045
Auto finance | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	5,564	5,564	11
Auto finance | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	642	642	0
Auto finance | 90+ Days Past Due
Summarized details of Loans
Total Past Due	0	0	0
Home equity
Summarized details of Loans
Current	601,049	601,049	584,177
Nonaccrual(a)(b)	7,325	7,325	7,726
Loans and Leases Receivable, Net of Deferred Income, Total	612,608	612,608	595,615
Home equity | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	3,322	3,322	2,867
Home equity | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	912	912	844
Home equity | 90+ Days Past Due
Summarized details of Loans
Total Past Due	0	0	0
Other consumer
Summarized details of Loans
Current	298,675	298,675	298,261
Nonaccrual(a)(b)	98	98	170
Loans and Leases Receivable, Net of Deferred Income, Total	301,475	301,475	301,723
Other consumer | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	995	995	1,835
Other consumer | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	596	596	472
Other consumer | 90+ Days Past Due
Summarized details of Loans
Total Past Due	1,111	1,111	986
Total consumer
Summarized details of Loans
Current	10,263,065	10,263,065	8,531,074
Nonaccrual(a)(b)	63,210	63,210	63,309
Loans and Leases Receivable, Net of Deferred Income, Total	10,346,121	10,346,121	8,607,693
Total consumer | 30-59 Days Past Due
Summarized details of Loans
Total Past Due	16,252	16,252	10,213
Total consumer | 60-89 Days Past Due
Summarized details of Loans
Total Past Due	2,296	2,296	1,985
Total consumer | 90+ Days Past Due
Summarized details of Loans
Total Past Due	$ 1,297	$ 1,297	$ 1,111