Loans, Loans by Past Due Status (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Summarized details of Loans
Financing Receivable, Not Past Due Status	$ 28,652,257	$ 24,077,931
Financing Receivable, Recorded Investment, Nonaccrual Status	111,467	130,443
Loans	28,799,569	24,224,949
Nonaccrual Loans, Current Portion	$ 64,000	$ 84,000
Percent of current nonaccrual loans	58.00%	65.00%
Financing Receivable, Nonaccrual, Interest Income	$ 0	$ 0
Financing Receivable, Nonaccrual, No Allowance	11,000	9,000
30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	26,256	12,754
60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	7,861	2,558
90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	1,728	1,263
Asset-based Lending
Summarized details of Loans
Financing Receivable, Not Past Due Status	458,887	178,027
Financing Receivable, Recorded Investment, Nonaccrual Status	0	0
Loans	458,887	178,027
Asset-based Lending | 30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	0	0
Asset-based Lending | 60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	0	0
Asset-based Lending | 90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	0	0
Commercial and industrial
Summarized details of Loans
Financing Receivable, Not Past Due Status	9,279,674	8,267,213
Financing Receivable, Recorded Investment, Nonaccrual Status	14,329	6,279
Loans	9,300,567	8,274,358
Commercial and industrial | 30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	716	619
Commercial and industrial | 60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	5,566	97
Commercial and industrial | 90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	282	151
Commercial real estate - owner occupied
Summarized details of Loans
Financing Receivable, Not Past Due Status	991,493	971,163
Financing Receivable, Recorded Investment, Nonaccrual Status	0	0
Loans	991,722	971,326
Commercial real estate - owner occupied | 30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	218	163
Commercial real estate - owner occupied | 60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	12	0
Commercial real estate - owner occupied | 90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	0	0
Commercial and business lending
Summarized details of Loans
Financing Receivable, Not Past Due Status	10,730,053	9,416,403
Financing Receivable, Recorded Investment, Nonaccrual Status	14,329	6,279
Loans	10,751,176	9,423,711
Commercial and business lending | 30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	934	781
Commercial and business lending | 60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	5,578	97
Commercial and business lending | 90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	282	151
Commercial real estate - investor
Summarized details of Loans
Financing Receivable, Not Past Due Status	5,049,897	4,323,276
Financing Receivable, Recorded Investment, Nonaccrual Status	29,380	60,677
Loans	5,080,344	4,384,569
Commercial real estate - investor | 30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	1,067	142
Commercial real estate - investor | 60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	0	474
Commercial real estate - investor | 90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	0	0
Real estate construction
Summarized details of Loans
Financing Receivable, Not Past Due Status	2,155,077	1,807,178
Financing Receivable, Recorded Investment, Nonaccrual Status	105	177
Loans	2,155,222	1,808,976
Real estate construction | 30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	39	1,618
Real estate construction | 60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	0	2
Real estate construction | 90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	0	0
Commercial real estate lending
Summarized details of Loans
Financing Receivable, Not Past Due Status	7,204,975	6,130,454
Financing Receivable, Recorded Investment, Nonaccrual Status	29,485	60,855
Loans	7,235,565	6,193,545
Commercial real estate lending | 30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	1,105	1,759
Commercial real estate lending | 60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	0	477
Commercial real estate lending | 90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	0	0
Total commercial
Summarized details of Loans
Financing Receivable, Not Past Due Status	17,935,028	15,546,857
Financing Receivable, Recorded Investment, Nonaccrual Status	43,814	67,134
Loans	17,986,742	15,617,256
Total commercial | 30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	2,040	2,541
Total commercial | 60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	5,578	573
Total commercial | 90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	282	151
Residential mortgage
Summarized details of Loans
Financing Receivable, Not Past Due Status	8,443,072	7,505,654
Financing Receivable, Recorded Investment, Nonaccrual Status	58,480	55,362
Loans	8,511,550	7,567,310
Residential mortgage | 30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	9,811	5,500
Residential mortgage | 60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	63	669
Residential mortgage | 90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	124	126
Auto
Summarized details of Loans
Financing Receivable, Not Past Due Status	1,371,176	142,982
Financing Receivable, Recorded Investment, Nonaccrual Status	1,490	52
Loans	1,382,073	143,045
Auto | 30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	8,238	11
Auto | 60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	1,170	0
Auto | 90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	0	0
Home equity
Summarized details of Loans
Financing Receivable, Not Past Due Status	611,259	584,177
Financing Receivable, Recorded Investment, Nonaccrual Status	7,487	7,726
Loans	624,353	595,615
Home equity | 30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	5,149	2,867
Home equity | 60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	458	844
Home equity | 90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	0	0
Other consumer
Summarized details of Loans
Financing Receivable, Not Past Due Status	291,722	298,261
Financing Receivable, Recorded Investment, Nonaccrual Status	197	170
Loans	294,851	301,723
Other consumer | 30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	1,018	1,835
Other consumer | 60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	592	472
Other consumer | 90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	1,322	986
Total consumer
Summarized details of Loans
Financing Receivable, Not Past Due Status	10,717,229	8,531,074
Financing Receivable, Recorded Investment, Nonaccrual Status	67,654	63,309
Loans	10,812,828	8,607,693
Total consumer | 30-59 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	24,216	10,213
Total consumer | 60-89 Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	2,283	1,985
Total consumer | 90+ Days Past Due
Summarized details of Loans
Financing Receivable, Past Due Status	$ 1,446	$ 1,111