Loans, Credit Quality Indicator by Vintage Year (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	$ 8,303	$ 18,966
Financing Receivable, Revolving	2,642,788	2,712,389
Financing Receivable, Originated in Current Fiscal Year	1,128,545	5,363,890
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	5,274,974	8,307,956
Financing Receivable, Originated Two Years before Latest Fiscal Year	8,211,066	6,039,862
Financing Receivable, Originated Three Years before Latest Fiscal Year	5,770,365	2,556,071
Financing Receivable, Originated Four Years before Latest Fiscal Year	2,409,052	1,578,023
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	4,057,474	2,658,026
Total	29,494,263	29,216,218
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	2,806	9,068
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	0	1,535
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	947	14,224
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	2,236	26,093
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	17,899	6,237
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	33	130
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	98	1,482
Charge offs	24,018	58,768
Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	4,184	10,204
Financing Receivable, Revolving	2,600,839	2,604,690
Financing Receivable, Originated in Current Fiscal Year	1,038,615	5,206,038
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	5,128,316	8,093,062
Financing Receivable, Originated Two Years before Latest Fiscal Year	8,014,215	5,886,359
Financing Receivable, Originated Three Years before Latest Fiscal Year	5,607,272	2,511,435
Financing Receivable, Originated Four Years before Latest Fiscal Year	2,370,376	1,537,747
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3,916,525	2,556,674
Total	28,676,159	28,396,005
Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	20	205
Financing Receivable, Revolving	15,787	23,595
Financing Receivable, Originated in Current Fiscal Year	0	8,893
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	13,999	74,020
Financing Receivable, Originated Two Years before Latest Fiscal Year	48,169	41,091
Financing Receivable, Originated Three Years before Latest Fiscal Year	37,270	6,213
Financing Receivable, Originated Four Years before Latest Fiscal Year	3,399	29,882
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	36,752	33,089
Total	155,375	216,784
Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	434	814
Financing Receivable, Revolving	26,026	83,872
Financing Receivable, Originated in Current Fiscal Year	85,342	131,753
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	115,707	112,289
Financing Receivable, Originated Two Years before Latest Fiscal Year	118,109	68,695
Financing Receivable, Originated Three Years before Latest Fiscal Year	97,816	27,253
Financing Receivable, Originated Four Years before Latest Fiscal Year	26,582	3,387
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	14,800	27,183
Total	484,383	454,432
Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	3,666	7,744
Financing Receivable, Revolving	137	231
Financing Receivable, Originated in Current Fiscal Year	4,588	17,206
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	16,952	28,584
Financing Receivable, Originated Two Years before Latest Fiscal Year	30,572	43,718
Financing Receivable, Originated Three Years before Latest Fiscal Year	28,007	11,170
Financing Receivable, Originated Four Years before Latest Fiscal Year	8,695	7,007
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	89,396	41,080
Total	178,346	148,997
Total commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	3,869	8,598
Financing Receivable, Revolving	1,938,423	1,991,827
Financing Receivable, Originated in Current Fiscal Year	718,430	3,781,028
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,734,133	5,687,614
Financing Receivable, Originated Two Years before Latest Fiscal Year	5,629,140	3,835,298
Financing Receivable, Originated Three Years before Latest Fiscal Year	3,597,858	1,127,677
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,007,588	917,114
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,650,888	848,341
Total	18,276,460	18,188,898
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	1,024	4,130
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	0	717
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	125	9,594
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	553	25,270
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	17,724	5,958
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	3	25
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	3	295
Charge offs	19,432	45,989
Total commercial | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	279	1,380
Financing Receivable, Revolving	1,899,301	1,887,058
Financing Receivable, Originated in Current Fiscal Year	629,429	3,626,800
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	3,591,627	5,489,219
Financing Receivable, Originated Two Years before Latest Fiscal Year	5,449,918	3,691,830
Financing Receivable, Originated Three Years before Latest Fiscal Year	3,445,296	1,093,633
Financing Receivable, Originated Four Years before Latest Fiscal Year	977,615	884,162
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,556,566	788,529
Total	17,549,751	17,461,232
Total commercial | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	14,883	22,552
Financing Receivable, Originated in Current Fiscal Year	0	8,265
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	13,305	72,084
Financing Receivable, Originated Two Years before Latest Fiscal Year	46,710	40,882
Financing Receivable, Originated Three Years before Latest Fiscal Year	37,146	6,164
Financing Receivable, Originated Four Years before Latest Fiscal Year	3,392	29,772
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	36,480	32,648
Total	151,916	212,368
Total commercial | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	434	804
Financing Receivable, Revolving	24,239	82,216
Financing Receivable, Originated in Current Fiscal Year	85,342	131,253
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	115,205	112,123
Financing Receivable, Originated Two Years before Latest Fiscal Year	118,017	68,695
Financing Receivable, Originated Three Years before Latest Fiscal Year	97,816	27,253
Financing Receivable, Originated Four Years before Latest Fiscal Year	26,582	3,180
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	14,545	27,157
Total	481,745	451,876
Total commercial | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	3,157	6,414
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	3,659	14,710
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	13,997	14,188
Financing Receivable, Originated Two Years before Latest Fiscal Year	14,495	33,891
Financing Receivable, Originated Three Years before Latest Fiscal Year	17,599	627
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	43,297	6
Total	93,047	63,422
Total commercial | Commercial and Industrial Sector
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	3,869	8,598
Financing Receivable, Revolving	1,769,772	1,796,951
Financing Receivable, Originated in Current Fiscal Year	365,538	1,764,466
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,786,369	2,977,719
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,927,740	1,914,057
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,806,637	419,934
Financing Receivable, Originated Four Years before Latest Fiscal Year	400,739	383,789
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	801,535	474,638
Total	9,858,329	9,731,555
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	1,024	4,130
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	0	717
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	125	9,594
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	553	25,270
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	17,724	5,958
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	3	0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	0	18
Charge offs	19,429	45,687
Total commercial | Commercial and Industrial Sector | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	279	1,380
Financing Receivable, Revolving	1,732,197	1,693,249
Financing Receivable, Originated in Current Fiscal Year	318,587	1,736,617
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,758,151	2,877,173
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,806,636	1,824,362
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,701,638	398,046
Financing Receivable, Originated Four Years before Latest Fiscal Year	380,164	383,695
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	774,950	449,006
Total	9,472,322	9,362,149
Total commercial | Commercial and Industrial Sector | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	14,287	21,779
Financing Receivable, Originated in Current Fiscal Year	0	4,017
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	13,305	46,610
Financing Receivable, Originated Two Years before Latest Fiscal Year	24,216	8,525
Financing Receivable, Originated Three Years before Latest Fiscal Year	27,909	3,529
Financing Receivable, Originated Four Years before Latest Fiscal Year	3,392	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	865	25,341
Total	83,973	109,801
Total commercial | Commercial and Industrial Sector | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	434	804
Financing Receivable, Revolving	23,288	81,924
Financing Receivable, Originated in Current Fiscal Year	44,013	10,515
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,283	39,748
Financing Receivable, Originated Two Years before Latest Fiscal Year	82,394	47,279
Financing Receivable, Originated Three Years before Latest Fiscal Year	59,491	17,732
Financing Receivable, Originated Four Years before Latest Fiscal Year	17,184	94
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,138	291
Total	229,791	197,582
Total commercial | Commercial and Industrial Sector | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	3,157	6,414
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	2,938	13,317
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	12,629	14,188
Financing Receivable, Originated Two Years before Latest Fiscal Year	14,495	33,891
Financing Receivable, Originated Three Years before Latest Fiscal Year	17,599	627
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	24,582	0
Total	72,243	62,022
Total commercial | Commercial real estate — owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	12,500	15,957
Financing Receivable, Originated in Current Fiscal Year	59,646	220,168
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	215,436	190,794
Financing Receivable, Originated Two Years before Latest Fiscal Year	193,440	251,783
Financing Receivable, Originated Three Years before Latest Fiscal Year	247,228	147,708
Financing Receivable, Originated Four Years before Latest Fiscal Year	142,306	138,816
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	225,339	96,473
Total	1,095,894	1,061,700
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	0	25
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	3	0
Charge offs	3	25
Total commercial | Commercial real estate — owner occupied | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	11,455	15,393
Financing Receivable, Originated in Current Fiscal Year	56,257	204,039
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	196,065	188,003
Financing Receivable, Originated Two Years before Latest Fiscal Year	191,357	239,218
Financing Receivable, Originated Three Years before Latest Fiscal Year	234,852	136,535
Financing Receivable, Originated Four Years before Latest Fiscal Year	133,883	135,730
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	218,224	92,339
Total	1,042,093	1,011,259
Total commercial | Commercial real estate — owner occupied | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	94	271
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	6,150
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	2,635
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	1,293
Total	94	10,349
Total commercial | Commercial real estate — owner occupied | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	950	292
Financing Receivable, Originated in Current Fiscal Year	2,667	14,735
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	18,003	2,791
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,083	6,416
Financing Receivable, Originated Three Years before Latest Fiscal Year	12,376	8,537
Financing Receivable, Originated Four Years before Latest Fiscal Year	8,423	3,086
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	7,114	2,841
Total	51,616	38,699
Total commercial | Commercial real estate — owner occupied | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	722	1,394
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,368	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Total	2,090	1,394
Total commercial | Commercial and business lending
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	3,869	8,598
Financing Receivable, Revolving	1,782,272	1,812,909
Financing Receivable, Originated in Current Fiscal Year	425,184	1,984,635
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,001,805	3,168,514
Financing Receivable, Originated Two Years before Latest Fiscal Year	3,121,180	2,165,840
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,053,865	567,642
Financing Receivable, Originated Four Years before Latest Fiscal Year	543,045	522,606
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	1,026,873	571,111
Total	10,954,223	10,793,255
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	1,024	4,130
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	0	717
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	125	9,594
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	553	25,270
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	17,724	5,958
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	3	25
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	3	18
Charge offs	19,432	45,713
Total commercial | Commercial and business lending | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	279	1,380
Financing Receivable, Revolving	1,743,652	1,708,642
Financing Receivable, Originated in Current Fiscal Year	374,844	1,940,657
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,954,216	3,065,177
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,997,992	2,063,580
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,936,490	534,581
Financing Receivable, Originated Four Years before Latest Fiscal Year	514,047	519,426
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	993,174	541,345
Total	10,514,415	10,373,408
Total commercial | Commercial and business lending | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	14,381	22,050
Financing Receivable, Originated in Current Fiscal Year	0	4,017
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	13,305	46,610
Financing Receivable, Originated Two Years before Latest Fiscal Year	24,216	14,675
Financing Receivable, Originated Three Years before Latest Fiscal Year	27,909	6,164
Financing Receivable, Originated Four Years before Latest Fiscal Year	3,392	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	865	26,634
Total	84,068	120,150
Total commercial | Commercial and business lending | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	434	804
Financing Receivable, Revolving	24,239	82,216
Financing Receivable, Originated in Current Fiscal Year	46,680	25,250
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	20,286	42,539
Financing Receivable, Originated Two Years before Latest Fiscal Year	84,477	53,695
Financing Receivable, Originated Three Years before Latest Fiscal Year	71,867	26,269
Financing Receivable, Originated Four Years before Latest Fiscal Year	25,606	3,180
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	8,252	3,132
Total	281,408	236,281
Total commercial | Commercial and business lending | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	3,157	6,414
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	3,659	14,710
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	13,997	14,188
Financing Receivable, Originated Two Years before Latest Fiscal Year	14,495	33,891
Financing Receivable, Originated Three Years before Latest Fiscal Year	17,599	627
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	24,582	0
Total	74,333	63,416
Total commercial | Commercial real estate — investor
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	131,886	155,611
Financing Receivable, Originated in Current Fiscal Year	234,727	1,374,116
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,257,561	1,342,492
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,330,362	1,121,633
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,049,946	472,355
Financing Receivable, Originated Four Years before Latest Fiscal Year	419,509	388,768
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	611,204	269,269
Total	5,035,195	5,124,245
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff		0
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff		0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff		0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff		0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff		252
Charge offs		252
Total commercial | Commercial real estate — investor | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	131,383	155,109
Financing Receivable, Originated in Current Fiscal Year	196,066	1,263,866
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,162,643	1,247,434
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,274,328	1,080,425
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,014,759	471,371
Financing Receivable, Originated Four Years before Latest Fiscal Year	418,534	358,996
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	550,600	239,230
Total	4,748,313	4,816,433
Total commercial | Commercial real estate — investor | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	502	502
Financing Receivable, Originated in Current Fiscal Year	0	4,248
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	25,474
Financing Receivable, Originated Two Years before Latest Fiscal Year	22,494	26,208
Financing Receivable, Originated Three Years before Latest Fiscal Year	9,238	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	29,772
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	35,614	6,014
Total	67,848	92,218
Total commercial | Commercial real estate — investor | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	38,662	106,002
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	94,918	69,584
Financing Receivable, Originated Two Years before Latest Fiscal Year	33,540	15,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	25,949	983
Financing Receivable, Originated Four Years before Latest Fiscal Year	975	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	6,293	24,025
Total	200,338	215,595
Total commercial | Commercial real estate — investor | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0
Financing Receivable, Revolving	0
Financing Receivable, Originated in Current Fiscal Year	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	18,697
Total	18,697
Total commercial | Real estate construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	24,266	23,307
Financing Receivable, Originated in Current Fiscal Year	58,519	422,277
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	474,768	1,176,608
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,177,598	547,825
Financing Receivable, Originated Three Years before Latest Fiscal Year	494,047	87,680
Financing Receivable, Originated Four Years before Latest Fiscal Year	45,034	5,740
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	12,810	7,960
Total	2,287,041	2,271,398
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff		0
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff		0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff		0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff		0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff		25
Charge offs		25
Total commercial | Real estate construction | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	24,266	23,307
Financing Receivable, Originated in Current Fiscal Year	58,519	422,277
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	474,768	1,176,608
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,177,598	547,825
Financing Receivable, Originated Three Years before Latest Fiscal Year	494,047	87,680
Financing Receivable, Originated Four Years before Latest Fiscal Year	45,034	5,740
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	12,792	7,954
Total	2,287,023	2,271,392
Total commercial | Real estate construction | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	18	6
Total	18	6
Total commercial | Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	156,151	178,918
Financing Receivable, Originated in Current Fiscal Year	293,246	1,796,393
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,732,329	2,519,100
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,507,960	1,669,458
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,543,993	560,035
Financing Receivable, Originated Four Years before Latest Fiscal Year	464,543	394,508
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	624,014	277,230
Total	7,322,237	7,395,644
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff		0
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff		0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff		0
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff		0
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff		0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff		0
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff		277
Charge offs		277
Total commercial | Commercial Real Estate | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	155,649	178,416
Financing Receivable, Originated in Current Fiscal Year	254,585	1,686,143
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,637,410	2,424,042
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,451,926	1,628,250
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,508,806	559,052
Financing Receivable, Originated Four Years before Latest Fiscal Year	463,568	364,737
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	563,392	247,184
Total	7,035,336	7,087,824
Total commercial | Commercial Real Estate | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	502	502
Financing Receivable, Originated in Current Fiscal Year	0	4,248
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	25,474
Financing Receivable, Originated Two Years before Latest Fiscal Year	22,494	26,208
Financing Receivable, Originated Three Years before Latest Fiscal Year	9,238	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	29,772
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	35,614	6,014
Total	67,848	92,218
Total commercial | Commercial Real Estate | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	38,662	106,002
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	94,918	69,584
Financing Receivable, Originated Two Years before Latest Fiscal Year	33,540	15,000
Financing Receivable, Originated Three Years before Latest Fiscal Year	25,949	983
Financing Receivable, Originated Four Years before Latest Fiscal Year	975	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	6,293	24,025
Total	200,338	215,595
Total commercial | Commercial Real Estate | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	18,715	6
Total	18,715	6
Total consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	4,434	10,369
Financing Receivable, Revolving	704,365	720,563
Financing Receivable, Originated in Current Fiscal Year	410,115	1,582,862
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,540,841	2,620,341
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,581,926	2,204,564
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,172,506	1,428,395
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,401,464	660,909
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,406,586	1,809,685
Total	11,217,802	11,027,319
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	1,782	4,937
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	0	818
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	822	4,630
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	1,683	823
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	175	279
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	30	105
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	95	1,187
Charge offs	4,586	12,779
Total consumer | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	3,905	8,824
Financing Receivable, Revolving	701,538	717,632
Financing Receivable, Originated in Current Fiscal Year	409,186	1,579,238
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,536,690	2,603,843
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,564,297	2,194,529
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,161,975	1,417,802
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,392,762	653,584
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,359,959	1,768,145
Total	11,126,407	10,934,773
Total consumer | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	20	205
Financing Receivable, Revolving	904	1,043
Financing Receivable, Originated in Current Fiscal Year	0	628
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	694	1,936
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,459	208
Financing Receivable, Originated Three Years before Latest Fiscal Year	123	49
Financing Receivable, Originated Four Years before Latest Fiscal Year	7	110
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	272	441
Total	3,459	4,416
Total consumer | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	10
Financing Receivable, Revolving	1,788	1,656
Financing Receivable, Originated in Current Fiscal Year	0	500
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	502	166
Financing Receivable, Originated Two Years before Latest Fiscal Year	92	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	207
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	255	26
Total	2,637	2,556
Total consumer | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	509	1,330
Financing Receivable, Revolving	137	231
Financing Receivable, Originated in Current Fiscal Year	928	2,496
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	2,955	14,396
Financing Receivable, Originated Two Years before Latest Fiscal Year	16,077	9,827
Financing Receivable, Originated Three Years before Latest Fiscal Year	10,407	10,544
Financing Receivable, Originated Four Years before Latest Fiscal Year	8,695	7,007
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	46,100	41,073
Total	85,299	85,574
Total consumer | Residential mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	24,427	354,236
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	397,954	1,627,070
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,667,606	2,119,836
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,095,841	1,424,583
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,398,141	654,675
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,284,210	1,684,490
Total	7,868,180	7,864,891
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	0	2
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	40	32
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	0	42
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	0	148
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	2	5
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	47	723
Charge offs	89	952
Total consumer | Residential mortgage | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	23,550	352,321
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	396,223	1,617,409
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,657,013	2,110,577
Financing Receivable, Originated Three Years before Latest Fiscal Year	2,086,129	1,414,186
Financing Receivable, Originated Four Years before Latest Fiscal Year	1,389,566	647,778
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2,244,891	1,650,542
Total	7,797,372	7,792,813
Total consumer | Residential mortgage | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	95
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	94	57
Total	94	152
Total consumer | Residential mortgage | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	0	490
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	467	93
Financing Receivable, Originated Two Years before Latest Fiscal Year	92	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	174
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	199	26
Total	759	784
Total consumer | Residential mortgage | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	877	1,425
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,264	9,567
Financing Receivable, Originated Two Years before Latest Fiscal Year	10,501	9,259
Financing Receivable, Originated Three Years before Latest Fiscal Year	9,712	10,397
Financing Receivable, Originated Four Years before Latest Fiscal Year	8,575	6,628
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	39,026	33,865
Total	69,954	71,142
Total consumer | Automobile Loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	384,147	1,220,471
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,136,306	959,094
Financing Receivable, Originated Two Years before Latest Fiscal Year	881,218	75,844
Financing Receivable, Originated Three Years before Latest Fiscal Year	69,094	163
Financing Receivable, Originated Four Years before Latest Fiscal Year	137	458
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	354	132
Total	2,471,257	2,256,162
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	0	0
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	0	795
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	767	4,524
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	1,675	626
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	158	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	0	5
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	0	0
Charge offs	2,600	5,950
Total consumer | Automobile Loan | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	384,126	1,218,820
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,133,964	952,839
Financing Receivable, Originated Two Years before Latest Fiscal Year	874,922	75,209
Financing Receivable, Originated Three Years before Latest Fiscal Year	68,423	163
Financing Receivable, Originated Four Years before Latest Fiscal Year	137	456
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	352	132
Total	2,461,925	2,247,618
Total consumer | Automobile Loan | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	0	619
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	634	1,850
Financing Receivable, Originated Two Years before Latest Fiscal Year	1,398	205
Financing Receivable, Originated Three Years before Latest Fiscal Year	117	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Total	2,148	2,674
Total consumer | Automobile Loan | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	26	73
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Total	26	73
Total consumer | Automobile Loan | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	0	0
Financing Receivable, Originated in Current Fiscal Year	21	1,032
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,682	4,332
Financing Receivable, Originated Two Years before Latest Fiscal Year	4,898	430
Financing Receivable, Originated Three Years before Latest Fiscal Year	554	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	3
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	2	0
Total	7,158	5,797
Total consumer | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	4,352	10,195
Financing Receivable, Revolving	515,127	521,434
Financing Receivable, Originated in Current Fiscal Year	51	1,717
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,563	30,445
Financing Receivable, Originated Two Years before Latest Fiscal Year	30,248	6,217
Financing Receivable, Originated Three Years before Latest Fiscal Year	6,090	2,500
Financing Receivable, Originated Four Years before Latest Fiscal Year	2,398	5,308
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	64,286	60,907
Total	619,764	628,526
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	93	53
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	0	21
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	0	3
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	0	31
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	0	0
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	0	22
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	15	294
Charge offs	108	424
Total consumer | Home equity | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	3,830	8,703
Financing Receivable, Revolving	514,998	521,000
Financing Receivable, Originated in Current Fiscal Year	21	1,678
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	1,508	29,863
Financing Receivable, Originated Two Years before Latest Fiscal Year	29,539	6,084
Financing Receivable, Originated Three Years before Latest Fiscal Year	5,949	2,327
Financing Receivable, Originated Four Years before Latest Fiscal Year	2,278	4,891
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	56,995	53,350
Total	611,286	619,192
Total consumer | Home equity | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	17	179
Financing Receivable, Revolving	53	200
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	46	87
Financing Receivable, Originated Two Years before Latest Fiscal Year	38	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	29
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	15
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	175	378
Total	312	708
Total consumer | Home equity | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	10
Financing Receivable, Revolving	0	75
Financing Receivable, Originated in Current Fiscal Year	0	10
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	9	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	33
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	56	0
Total	65	118
Total consumer | Home equity | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	505	1,302
Financing Receivable, Revolving	76	160
Financing Receivable, Originated in Current Fiscal Year	31	29
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	495
Financing Receivable, Originated Two Years before Latest Fiscal Year	671	132
Financing Receivable, Originated Three Years before Latest Fiscal Year	141	144
Financing Receivable, Originated Four Years before Latest Fiscal Year	120	368
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	7,061	7,180
Total	8,100	8,508
Total consumer | Other consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	82	174
Financing Receivable, Revolving	189,238	199,129
Financing Receivable, Originated in Current Fiscal Year	1,489	6,438
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	5,018	3,733
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,854	2,668
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,480	1,149
Financing Receivable, Originated Four Years before Latest Fiscal Year	788	468
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	57,735	64,156
Total	258,603	277,740
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
Financing Receivable, Revolving, Writeoff	1,688	4,884
Financing Receivable, Year One, Originated, Current Fiscal Year, Writeoff	0	0
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year, Writeoff	15	72
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year, Writeoff	8	124
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year, Writeoff	17	131
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year, Writeoff	28	72
Financing Receivable, Originated, More than Five Years before Current Fiscal Year, Writeoff	34	170
Charge offs	1,790	5,453
Total consumer | Other consumer | Pass [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	75	121
Financing Receivable, Revolving	186,540	196,632
Financing Receivable, Originated in Current Fiscal Year	1,489	6,419
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	4,995	3,732
Financing Receivable, Originated Two Years before Latest Fiscal Year	2,823	2,658
Financing Receivable, Originated Three Years before Latest Fiscal Year	1,474	1,127
Financing Receivable, Originated Four Years before Latest Fiscal Year	781	460
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	57,722	64,121
Total	255,824	275,149
Total consumer | Other consumer | Special Mention [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	3	26
Financing Receivable, Revolving	850	843
Financing Receivable, Originated in Current Fiscal Year	0	9
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	14	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	24	3
Financing Receivable, Originated Three Years before Latest Fiscal Year	6	20
Financing Receivable, Originated Four Years before Latest Fiscal Year	7	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	3	6
Total	904	881
Total consumer | Other consumer | Substandard
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	0	0
Financing Receivable, Revolving	1,788	1,582
Financing Receivable, Originated in Current Fiscal Year	0	0
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	0	0
Financing Receivable, Originated Two Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	0
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	0	0
Total	1,788	1,582
Total consumer | Other consumer | Nonaccrual Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Revolving, Converted To Term Loan	4	27
Financing Receivable, Revolving	61	71
Financing Receivable, Originated in Current Fiscal Year	0	10
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year	9	1
Financing Receivable, Originated Two Years before Latest Fiscal Year	7	6
Financing Receivable, Originated Three Years before Latest Fiscal Year	0	2
Financing Receivable, Originated Four Years before Latest Fiscal Year	0	8
Financing Receivable, Originated Five or More Years before Latest Fiscal Year	11	29
Total	$ 87	$ 128