Loans and Allowance for Credit Losses for Loans - Amortized Cost In Those Loan Classes Based on Payment Activity by Origination Year (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 35,364,405	$ 34,153,657
90 Days or More Past Due Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	11,407	2,771
Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	394,913	1,448,602
Year two, fiscal year before current fiscal year	1,487,234	635,888
Year three, two years before current fiscal year	603,634	575,538
Year four, three years before current fiscal year	565,297	427,208
Year five, four years before current fiscal year	349,901	370,958
More than five years before current fiscal year	1,221,498	1,016,528
Revolving Loans Amortized Cost Basis	69,458	70,342
Revolving Loans Converted to Term Loans	0	0
Total	4,691,935	4,545,064
Residential mortgage | 90 Days or More Past Due Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,746	677
Residential mortgage | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	394,913	1,448,602
Year two, fiscal year before current fiscal year	1,487,234	635,531
Year three, two years before current fiscal year	603,092	572,911
Year four, three years before current fiscal year	563,634	425,152
Year five, four years before current fiscal year	345,807	368,164
More than five years before current fiscal year	1,220,733	1,014,190
Revolving Loans Amortized Cost Basis	69,458	70,342
Revolving Loans Converted to Term Loans	0	0
Total	4,684,871	4,534,892
Residential mortgage | Non-Performing Loans | 90 Days or More Past Due Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	0	0
Year two, fiscal year before current fiscal year	0	357
Year three, two years before current fiscal year	542	2,627
Year four, three years before current fiscal year	1,663	2,056
Year five, four years before current fiscal year	4,094	2,794
More than five years before current fiscal year	765	2,338
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans	0	0
Total	7,064	10,172
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	155,298	752,371
Year two, fiscal year before current fiscal year	696,205	322,296
Year three, two years before current fiscal year	291,578	292,368
Year four, three years before current fiscal year	257,981	172,014
Year five, four years before current fiscal year	147,755	79,202
More than five years before current fiscal year	98,369	43,367
Revolving Loans Amortized Cost Basis	1,254,994	1,265,942
Revolving Loans Converted to Term Loans	41,156	43,416
Total	2,943,336	2,970,976
Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	5,735	13,847
Year two, fiscal year before current fiscal year	13,431	5,723
Year three, two years before current fiscal year	5,258	6,994
Year four, three years before current fiscal year	6,173	7,384
Year five, four years before current fiscal year	6,486	5,359
More than five years before current fiscal year	16,777	13,632
Revolving Loans Amortized Cost Basis	298,522	304,424
Revolving Loans Converted to Term Loans	41,156	43,416
Total	393,538	400,779
Consumer | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	142,530	735,575
Year two, fiscal year before current fiscal year	678,559	309,856
Year three, two years before current fiscal year	279,952	278,906
Year four, three years before current fiscal year	245,389	157,613
Year five, four years before current fiscal year	134,433	72,834
More than five years before current fiscal year	72,065	15,252
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans	0	0
Total	1,552,928	1,570,036
Consumer | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	7,033	2,949
Year two, fiscal year before current fiscal year	4,215	6,717
Year three, two years before current fiscal year	6,368	6,468
Year four, three years before current fiscal year	6,419	7,017
Year five, four years before current fiscal year	6,836	1,009
More than five years before current fiscal year	9,527	14,483
Revolving Loans Amortized Cost Basis	956,472	961,518
Revolving Loans Converted to Term Loans	0	0
Total	996,870	1,000,161
Consumer | 90 Days or More Past Due Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	400	789
Consumer | 90 Days or More Past Due Loans | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Consumer | 90 Days or More Past Due Loans | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Total	4	271
Consumer | 90 Days or More Past Due Loans | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total	396	518
Consumer | Performing | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	5,735	13,847
Year two, fiscal year before current fiscal year	13,431	5,723
Year three, two years before current fiscal year	5,258	6,994
Year four, three years before current fiscal year	6,173	7,384
Year five, four years before current fiscal year	6,486	5,359
More than five years before current fiscal year	16,775	13,597
Revolving Loans Amortized Cost Basis	298,122	303,888
Revolving Loans Converted to Term Loans	40,566	42,822
Total	392,546	399,614
Consumer | Performing | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	142,530	735,446
Year two, fiscal year before current fiscal year	678,425	309,856
Year three, two years before current fiscal year	279,849	278,828
Year four, three years before current fiscal year	245,235	157,450
Year five, four years before current fiscal year	134,274	72,753
More than five years before current fiscal year	71,935	15,171
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans	0	0
Total	1,552,248	1,569,504
Consumer | Performing | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	7,033	2,949
Year two, fiscal year before current fiscal year	4,215	6,717
Year three, two years before current fiscal year	6,368	6,468
Year four, three years before current fiscal year	6,419	7,017
Year five, four years before current fiscal year	6,836	1,009
More than five years before current fiscal year	9,527	14,483
Revolving Loans Amortized Cost Basis	956,468	961,027
Revolving Loans Converted to Term Loans	0	0
Total	996,866	999,670
Consumer | Non-Performing Loans | 90 Days or More Past Due Loans | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	0	0
Year two, fiscal year before current fiscal year	0	0
Year three, two years before current fiscal year	0	0
Year four, three years before current fiscal year	0	0
Year five, four years before current fiscal year	0	0
More than five years before current fiscal year	2	35
Revolving Loans Amortized Cost Basis	400	536
Revolving Loans Converted to Term Loans	590	594
Total	992	1,165
Consumer | Non-Performing Loans | 90 Days or More Past Due Loans | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	0	129
Year two, fiscal year before current fiscal year	134	0
Year three, two years before current fiscal year	103	78
Year four, three years before current fiscal year	154	163
Year five, four years before current fiscal year	159	81
More than five years before current fiscal year	130	81
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans	0	0
Total	680	532
Consumer | Non-Performing Loans | 90 Days or More Past Due Loans | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	0	0
Year two, fiscal year before current fiscal year	0	0
Year three, two years before current fiscal year	0	0
Year four, three years before current fiscal year	0	0
Year five, four years before current fiscal year	0	0
More than five years before current fiscal year	0	0
Revolving Loans Amortized Cost Basis	4	491
Revolving Loans Converted to Term Loans	0	0
Total	$ 4	$ 491