Loans and Allowance for Credit Losses for Loans - Amortized Cost per Loan Class Based on Payment Activity by Origination Year (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Total	$ 46,917,200	$ 34,153,657
90 Days or More Past Due Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	26,587	2,771
Residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	1,302,279	1,448,602
Year two, fiscal year before current fiscal year	1,502,819	635,888
Year three, two years before current fiscal year	571,607	575,538
Year four, three years before current fiscal year	502,032	427,208
Year five, four years before current fiscal year	340,938	370,958
More than five years before current fiscal year	1,078,169	1,016,528
Revolving Loans Amortized Cost Basis	66,706	70,342
Revolving Loans Converted to Term Loans	0	0
Total	5,364,550	4,545,064
Residential mortgage | 90 Days or More Past Due Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1,866	677
Residential mortgage | Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	1,302,279	1,448,602
Year two, fiscal year before current fiscal year	1,502,622	635,531
Year three, two years before current fiscal year	571,390	572,911
Year four, three years before current fiscal year	500,197	425,152
Year five, four years before current fiscal year	338,062	368,164
More than five years before current fiscal year	1,073,995	1,014,190
Revolving Loans Amortized Cost Basis	66,706	70,342
Revolving Loans Converted to Term Loans	0	0
Total	5,355,251	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	197	357
Year three, two years before current fiscal year	217	2,627
Year four, three years before current fiscal year	1,835	2,056
Year five, four years before current fiscal year	2,876	2,794
More than five years before current fiscal year	4,174	2,338
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans	0	0
Total	9,299	10,172
Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	795,819	752,371
Year two, fiscal year before current fiscal year	547,709	322,296
Year three, two years before current fiscal year	217,412	292,368
Year four, three years before current fiscal year	178,742	172,014
Year five, four years before current fiscal year	93,100	79,202
More than five years before current fiscal year	74,268	43,367
Revolving Loans Amortized Cost Basis	1,368,622	1,265,942
Revolving Loans Converted to Term Loans	39,280	43,416
Total	3,314,952	2,970,976
Home equity | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	47,084	13,847
Year two, fiscal year before current fiscal year	12,432	5,723
Year three, two years before current fiscal year	4,592	6,994
Year four, three years before current fiscal year	5,024	7,384
Year five, four years before current fiscal year	5,581	5,359
More than five years before current fiscal year	13,007	13,632
Revolving Loans Amortized Cost Basis	376,884	304,424
Revolving Loans Converted to Term Loans	39,280	43,416
Total	503,884	400,779
Home equity | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	724,595	735,575
Year two, fiscal year before current fiscal year	525,133	309,856
Year three, two years before current fiscal year	204,614	278,906
Year four, three years before current fiscal year	166,283	157,613
Year five, four years before current fiscal year	80,113	72,834
More than five years before current fiscal year	45,487	15,252
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans	0	0
Total	1,746,225	1,570,036
Home equity | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	24,140	2,949
Year two, fiscal year before current fiscal year	10,144	6,717
Year three, two years before current fiscal year	8,206	6,468
Year four, three years before current fiscal year	7,435	7,017
Year five, four years before current fiscal year	7,406	1,009
More than five years before current fiscal year	15,774	14,483
Revolving Loans Amortized Cost Basis	991,738	961,518
Revolving Loans Converted to Term Loans	0	0
Total	1,064,843	1,000,161
Home equity | 90 Days or More Past Due Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total	47	789
Home equity | 90 Days or More Past Due Loans | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Total	0	0
Home equity | 90 Days or More Past Due Loans | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Total	1	271
Home equity | 90 Days or More Past Due Loans | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total	46	518
Home equity | Performing | Home equity
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	47,084	13,847
Year two, fiscal year before current fiscal year	12,432	5,723
Year three, two years before current fiscal year	4,592	6,994
Year four, three years before current fiscal year	5,024	7,384
Year five, four years before current fiscal year	5,581	5,359
More than five years before current fiscal year	13,007	13,597
Revolving Loans Amortized Cost Basis	376,608	303,888
Revolving Loans Converted to Term Loans	38,570	42,822
Total	502,898	399,614
Home equity | Performing | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	724,557	735,446
Year two, fiscal year before current fiscal year	525,017	309,856
Year three, two years before current fiscal year	204,578	278,828
Year four, three years before current fiscal year	166,103	157,450
Year five, four years before current fiscal year	80,012	72,753
More than five years before current fiscal year	45,415	15,171
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans	0	0
Total	1,745,682	1,569,504
Home equity | Performing | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	24,140	2,949
Year two, fiscal year before current fiscal year	10,144	6,717
Year three, two years before current fiscal year	8,206	6,468
Year four, three years before current fiscal year	7,435	7,017
Year five, four years before current fiscal year	7,406	1,009
More than five years before current fiscal year	15,736	14,483
Revolving Loans Amortized Cost Basis	991,737	961,027
Revolving Loans Converted to Term Loans	0	0
Total	1,064,804	999,670
Home equity | 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	0	35
Revolving Loans Amortized Cost Basis	276	536
Revolving Loans Converted to Term Loans	710	594
Total	986	1,165
Home equity | Non-Performing Loans | 90 Days or More Past Due Loans | Automobile
Financing Receivable, Credit Quality Indicator [Line Items]
Year one, current fiscal year	38	129
Year two, fiscal year before current fiscal year	116	0
Year three, two years before current fiscal year	36	78
Year four, three years before current fiscal year	180	163
Year five, four years before current fiscal year	101	81
More than five years before current fiscal year	72	81
Revolving Loans Amortized Cost Basis	0	0
Revolving Loans Converted to Term Loans	0	0
Total	543	532
Home equity | 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	38	0
Revolving Loans Amortized Cost Basis	1	491
Revolving Loans Converted to Term Loans	0	0
Total	$ 39	$ 491