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	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 43,560,777	$ 34,153,657
90 Days or More Past Due Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	16,925	2,771
Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	768,137	1,448,602
Year two, fiscal year before current fiscal year	1,518,240	635,888
Year three, two years before current fiscal year	594,641	575,538
Year four, three years before current fiscal year	517,072	427,208
Year five, four years before current fiscal year	365,855	370,958
More than five years before current fiscal year	1,165,615	1,016,528
Revolving Loans Amortized Cost Basis	75,509	70,342
Revolving Loans Converted to Term Loans	0	0
Total	5,005,069	4,545,064
Residential mortgage | 90 Days or More Past Due Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,188	677
Residential mortgage | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	768,137	1,448,602
Year two, fiscal year before current fiscal year	1,518,240	635,531
Year three, two years before current fiscal year	593,271	572,911
Year four, three years before current fiscal year	515,561	425,152
Year five, four years before current fiscal year	363,811	368,164
More than five years before current fiscal year	1,162,383	1,014,190
Revolving Loans Amortized Cost Basis	75,509	70,342
Revolving Loans Converted to Term Loans	0	0
Total	4,996,912	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	1,370	2,627
Year four, three years before current fiscal year	1,511	2,056
Year five, four years before current fiscal year	2,044	2,794
More than five years before current fiscal year	3,232	2,338
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans	0	0
Total	8,157	10,172
Consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	444,551	752,371
Year two, fiscal year before current fiscal year	637,527	322,296
Year three, two years before current fiscal year	264,469	292,368
Year four, three years before current fiscal year	229,386	172,014
Year five, four years before current fiscal year	127,416	79,202
More than five years before current fiscal year	80,768	43,367
Revolving Loans Amortized Cost Basis	1,307,384	1,265,942
Revolving Loans Converted to Term Loans	40,290	43,416
Total	3,131,791	2,970,976
Consumer | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	21,198	13,847
Year two, fiscal year before current fiscal year	13,068	5,723
Year three, two years before current fiscal year	4,946	6,994
Year four, three years before current fiscal year	5,645	7,384
Year five, four years before current fiscal year	6,212	5,359
More than five years before current fiscal year	15,065	13,632
Revolving Loans Amortized Cost Basis	325,031	304,424
Revolving Loans Converted to Term Loans	40,290	43,416
Total	431,455	400,779
Consumer | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	408,872	735,575
Year two, fiscal year before current fiscal year	621,365	309,856
Year three, two years before current fiscal year	252,184	278,906
Year four, three years before current fiscal year	216,131	157,613
Year five, four years before current fiscal year	114,048	72,834
More than five years before current fiscal year	60,882	15,252
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans	0	0
Total	1,673,482	1,570,036
Consumer | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	14,481	2,949
Year two, fiscal year before current fiscal year	3,094	6,717
Year three, two years before current fiscal year	7,339	6,468
Year four, three years before current fiscal year	7,610	7,017
Year five, four years before current fiscal year	7,156	1,009
More than five years before current fiscal year	4,821	14,483
Revolving Loans Amortized Cost Basis	982,353	961,518
Revolving Loans Converted to Term Loans	0	0
Total	1,026,854	1,000,161
Consumer | 90 Days or More Past Due Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	267	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	267	271
Consumer | 90 Days or More Past Due Loans | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	518
Consumer | Performing | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	21,198	13,847
Year two, fiscal year before current fiscal year	13,068	5,723
Year three, two years before current fiscal year	4,946	6,994
Year four, three years before current fiscal year	5,645	7,384
Year five, four years before current fiscal year	6,212	5,359
More than five years before current fiscal year	15,064	13,597
Revolving Loans Amortized Cost Basis	324,606	303,888
Revolving Loans Converted to Term Loans	39,702	42,822
Total	430,441	399,614
Consumer | Performing | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	408,872	735,446
Year two, fiscal year before current fiscal year	621,275	309,856
Year three, two years before current fiscal year	252,127	278,828
Year four, three years before current fiscal year	215,999	157,450
Year five, four years before current fiscal year	113,834	72,753
More than five years before current fiscal year	60,789	15,171
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans	0	0
Total	1,672,896	1,569,504
Consumer | Performing | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	14,481	2,949
Year two, fiscal year before current fiscal year	3,094	6,717
Year three, two years before current fiscal year	7,339	6,468
Year four, three years before current fiscal year	7,610	7,017
Year five, four years before current fiscal year	7,156	1,009
More than five years before current fiscal year	4,821	14,483
Revolving Loans Amortized Cost Basis	982,353	961,027
Revolving Loans Converted to Term Loans	0	0
Total	1,026,854	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	1	35
Revolving Loans Amortized Cost Basis	425	536
Revolving Loans Converted to Term Loans	588	594
Total	1,014	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	90	0
Year three, two years before current fiscal year	57	78
Year four, three years before current fiscal year	132	163
Year five, four years before current fiscal year	214	81
More than five years before current fiscal year	93	81
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans	0	0
Total	$ 586	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
Year two, fiscal year before current fiscal year		0
Year three, two years before current fiscal year		0
Year four, three years before current fiscal year		0
Year five, four years before current fiscal year		0
More than five years before current fiscal year		0
Revolving Loans Amortized Cost Basis		491
Revolving Loans Converted to Term Loans		0
Total		$ 491