Allowance for Credit Losses - Amortized Cost Basis by Year of Origination and Credit Quality Indicator (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Credit quality
Financing Receivable, before Allowance for Credit Loss, Total	$ 14,092,012	$ 12,961,999
Loss
Credit quality
Financing Receivable, before Allowance for Credit Loss, Total	0	0
Residential Lending: Residential Mortgage
Credit quality
2021/2022	687,599	1,304,978
2020/2021	1,227,369	753,668
2019/2020	677,025	363,415
2018/2019	309,308	266,368
2017/2018	217,050	332,041
Prior	1,174,681	1,062,135
Revolving Loans Amortized Cost Basis	9,202	44
Revolving Loans Converted to Term Loans Amortized Cost Basis	554	718
Financing Receivable, before Allowance for Credit Loss, Total	4,302,788	4,083,367
Residential Lending: Residential Mortgage | 740 and greater
Credit quality
2021/2022	557,636	1,101,958
2020/2021	1,064,444	635,061
2019/2020	560,463	286,993
2018/2019	245,241	198,622
2017/2018	165,258	251,906
Prior	920,100	829,175
Financing Receivable, before Allowance for Credit Loss, Total	3,513,142	3,303,715
Residential Lending: Residential Mortgage | 680 - 739
Credit quality
2021/2022	73,929	140,997
2020/2021	112,672	81,590
2019/2020	82,416	45,163
2018/2019	40,355	27,315
2017/2018	22,126	32,855
Prior	130,508	125,906
Financing Receivable, before Allowance for Credit Loss, Total	462,006	453,826
Residential Lending: Residential Mortgage | 620 - 679
Credit quality
2021/2022	12,320	15,781
2020/2021	13,804	11,943
2019/2020	9,881	5,268
2018/2019	3,649	10,149
2017/2018	3,054	9,069
Prior	35,441	37,404
Financing Receivable, before Allowance for Credit Loss, Total	78,149	89,614
Residential Lending: Residential Mortgage | 550 - 619
Credit quality
2021/2022	2,455	1,735
2020/2021	2,246	873
2019/2020	1,791	698
2018/2019	263	533
2017/2018	601	2,033
Prior	6,955	7,475
Financing Receivable, before Allowance for Credit Loss, Total	14,311	13,347
Residential Lending: Residential Mortgage | Less than 550
Credit quality
2020/2021	1,321
2019/2020	367
2018/2019		345
2017/2018	966	2,603
Prior	5,304	2,838
Financing Receivable, before Allowance for Credit Loss, Total	7,958	5,786
Residential Lending: Residential Mortgage | No Score
Credit quality
2021/2022	22,289	18,882
2020/2021	14,671	7,938
2019/2020	6,820	15,051
2018/2019	10,599	18,107
2017/2018	15,921	17,333
Prior	47,245	42,185
Financing Receivable, before Allowance for Credit Loss, Total	117,545	119,496
Residential Lending: Residential Mortgage | Fico Other
Credit quality
2021/2022	18,970	25,625
2020/2021	18,211	16,263
2019/2020	15,287	10,242
2018/2019	9,201	11,297
2017/2018	9,124	16,242
Prior	29,128	17,152
Revolving Loans Amortized Cost Basis	9,202	44
Revolving Loans Converted to Term Loans Amortized Cost Basis	554	718
Financing Receivable, before Allowance for Credit Loss, Total	109,677	97,583
Home equity line
Credit quality
Revolving Loans Amortized Cost Basis		867,251
Revolving Loans Converted to Term Loans Amortized Cost Basis		9,357
Financing Receivable, before Allowance for Credit Loss, Total		876,608
Home equity line | 740 and greater
Credit quality
Revolving Loans Amortized Cost Basis	817,123	671,566
Revolving Loans Converted to Term Loans Amortized Cost Basis	2,059	1,873
Financing Receivable, before Allowance for Credit Loss, Total	819,182	673,439
Home equity line | 680 - 739
Credit quality
Revolving Loans Amortized Cost Basis	171,117	141,889
Revolving Loans Converted to Term Loans Amortized Cost Basis	2,714	3,968
Financing Receivable, before Allowance for Credit Loss, Total	173,831	145,857
Home equity line | 620 - 679
Credit quality
Revolving Loans Amortized Cost Basis	45,368	37,815
Revolving Loans Converted to Term Loans Amortized Cost Basis	2,100	2,500
Financing Receivable, before Allowance for Credit Loss, Total	47,468	40,315
Home equity line | 550 - 619
Credit quality
Revolving Loans Amortized Cost Basis	7,485	9,090
Revolving Loans Converted to Term Loans Amortized Cost Basis	1,029	948
Financing Receivable, before Allowance for Credit Loss, Total	8,514	10,038
Home equity line | Less than 550
Credit quality
Revolving Loans Amortized Cost Basis	1,151	2,574
Revolving Loans Converted to Term Loans Amortized Cost Basis	481	68
Financing Receivable, before Allowance for Credit Loss, Total	1,632	2,642
Home equity line | No Score
Credit quality
Revolving Loans Amortized Cost Basis	4,724	4,317
Financing Receivable, before Allowance for Credit Loss, Total	4,724	4,317
Total loans
Credit quality
2021/2022	2,560,433	3,157,488
2020/2021	2,880,346	1,588,735
2019/2020	1,319,250	1,632,764
2018/2019	1,311,719	1,164,714
2017/2018	825,528	954,259
Prior	2,699,183	2,359,432
Revolving Loans Amortized Cost Basis	2,467,297	2,033,383
Revolving Loans Converted to Term Loans Amortized Cost Basis	28,256	71,224
Financing Receivable, before Allowance for Credit Loss, Total	14,092,012	12,961,999
Residential Portfolio Segment [Member]
Credit quality
Financing Receivable, before Allowance for Credit Loss, Total	4,302,788	4,083,367
Residential Portfolio Segment [Member] | Home equity line
Credit quality
2021/2022		1,304,978
2020/2021		753,668
2019/2020		363,415
2018/2019		266,368
2017/2018		332,041
Prior		1,062,135
Revolving Loans Amortized Cost Basis		867,295
Revolving Loans Converted to Term Loans Amortized Cost Basis		10,075
Financing Receivable, before Allowance for Credit Loss, Total		4,959,975
Home equity Line
Credit quality
Financing Receivable, before Allowance for Credit Loss, Total	1,055,351	876,608
Consumer Portfolio Segment [Member]
Credit quality
2021/2022	335,116	306,140
2020/2021	218,940	174,166
2019/2020	112,885	184,913
2018/2019	105,789	124,197
2017/2018	57,786	67,459
Prior	28,131	24,158
Revolving Loans Amortized Cost Basis	361,126	344,870
Revolving Loans Converted to Term Loans Amortized Cost Basis	3,161	4,036
Financing Receivable, before Allowance for Credit Loss, Total	1,222,934	1,229,939
Consumer Portfolio Segment [Member] | 740 and greater
Credit quality
2021/2022	200,887	155,929
2020/2021	111,047	83,337
2019/2020	53,534	79,617
2018/2019	43,912	56,707
2017/2018	24,951	24,525
Prior	8,432	8,067
Revolving Loans Amortized Cost Basis	125,126	117,843
Revolving Loans Converted to Term Loans Amortized Cost Basis	185	209
Financing Receivable, before Allowance for Credit Loss, Total	568,074	526,234
Consumer Portfolio Segment [Member] | 680 - 739
Credit quality
2021/2022	99,787	93,214
2020/2021	67,140	56,327
2019/2020	37,260	55,126
2018/2019	31,751	34,049
2017/2018	15,874	17,527
Prior	7,665	6,315
Revolving Loans Amortized Cost Basis	72,101	69,366
Revolving Loans Converted to Term Loans Amortized Cost Basis	514	707
Financing Receivable, before Allowance for Credit Loss, Total	332,092	332,631
Consumer Portfolio Segment [Member] | 620 - 679
Credit quality
2021/2022	25,949	41,671
2020/2021	29,587	21,986
2019/2020	14,226	28,491
2018/2019	16,872	19,403
2017/2018	9,672	12,952
Prior	6,488	5,324
Revolving Loans Amortized Cost Basis	31,854	31,165
Revolving Loans Converted to Term Loans Amortized Cost Basis	937	1,175
Financing Receivable, before Allowance for Credit Loss, Total	135,585	162,167
Consumer Portfolio Segment [Member] | 550 - 619
Credit quality
2021/2022	3,017	7,836
2020/2021	5,475	8,265
2019/2020	5,226	13,265
2018/2019	8,056	10,497
2017/2018	5,396	7,469
Prior	3,924	3,244
Revolving Loans Amortized Cost Basis	11,269	10,359
Revolving Loans Converted to Term Loans Amortized Cost Basis	854	1,089
Financing Receivable, before Allowance for Credit Loss, Total	43,217	62,024
Consumer Portfolio Segment [Member] | Less than 550
Credit quality
2021/2022	656	2,272
2020/2021	1,351	3,867
2019/2020	2,286	6,646
2018/2019	3,779	3,484
2017/2018	1,869	2,739
Prior	1,593	1,175
Revolving Loans Amortized Cost Basis	3,541	3,195
Revolving Loans Converted to Term Loans Amortized Cost Basis	443	536
Financing Receivable, before Allowance for Credit Loss, Total	15,518	23,914
Consumer Portfolio Segment [Member] | No Score
Credit quality
2021/2022	3,205	481
2020/2021	258	19
2019/2020		56
2018/2019	51	40
2017/2018	24	65
Prior	29	2
Revolving Loans Amortized Cost Basis	38,805	35,414
Revolving Loans Converted to Term Loans Amortized Cost Basis	227	320
Financing Receivable, before Allowance for Credit Loss, Total	42,599	36,397
Consumer Portfolio Segment [Member] | Fico Other
Credit quality
2021/2022	1,615	4,737
2020/2021	4,082	365
2019/2020	353	1,712
2018/2019	1,368	17
2017/2018		2,182
Prior		31
Revolving Loans Amortized Cost Basis	78,430	77,528
Revolving Loans Converted to Term Loans Amortized Cost Basis	1
Financing Receivable, before Allowance for Credit Loss, Total	85,849	86,572
Residential Mortgage loans
Credit quality
2021/2022	687,599
2020/2021	1,227,369
2019/2020	677,025
2018/2019	309,308
2017/2018	217,050
Prior	1,174,681
Revolving Loans Amortized Cost Basis	1,056,170
Revolving Loans Converted to Term Loans Amortized Cost Basis	8,937
Financing Receivable, before Allowance for Credit Loss, Total	5,358,139
Home Equity Loans and Lines of Credit
Credit quality
Revolving Loans Amortized Cost Basis	1,046,968
Revolving Loans Converted to Term Loans Amortized Cost Basis	8,383
Financing Receivable, before Allowance for Credit Loss, Total	1,055,351
Commercial and Industrial
Credit quality
2021/2022	380,244	637,126
2020/2021	430,817	142,497
2019/2020	61,473	237,293
2018/2019	177,922	106,699
2017/2018	54,209	32,409
Prior	140,740	177,825
Revolving Loans Amortized Cost Basis	974,334	711,028
Revolving Loans Converted to Term Loans Amortized Cost Basis	16,158	42,222
Financing Receivable, before Allowance for Credit Loss, Total	2,235,897	2,087,099
Commercial and Industrial | Pass
Credit quality
2021/2022	359,881	623,098
2020/2021	422,567	129,665
2019/2020	54,656	223,388
2018/2019	170,222	88,409
2017/2018	51,476	29,380
Prior	137,257	168,591
Revolving Loans Amortized Cost Basis	894,384	644,947
Revolving Loans Converted to Term Loans Amortized Cost Basis	15,715	40,193
Financing Receivable, before Allowance for Credit Loss, Total	2,106,158	1,947,671
Commercial and Industrial | Special mention
Credit quality
2021/2022	2,059	397
2020/2021	240	4,382
2019/2020	1,371	4,213
2018/2019	2,643	12,552
2017/2018	184	974
Prior	1,431	5,313
Revolving Loans Amortized Cost Basis	22,897	4,804
Revolving Loans Converted to Term Loans Amortized Cost Basis	378	986
Financing Receivable, before Allowance for Credit Loss, Total	31,203	33,621
Commercial and Industrial | Substandard
Credit quality
2021/2022	625	354
2020/2021	289	1,380
2019/2020	1,117	1,951
2018/2019	1,092	1,285
2017/2018	668	60
Prior	885	3,551
Revolving Loans Amortized Cost Basis	14,733	17,893
Revolving Loans Converted to Term Loans Amortized Cost Basis	65	1,043
Financing Receivable, before Allowance for Credit Loss, Total	19,474	27,517
Commercial and Industrial | Other Indicator
Credit quality
2021/2022	17,679	13,277
2020/2021	7,721	7,070
2019/2020	4,329	7,741
2018/2019	3,965	4,453
2017/2018	1,881	1,995
Prior	1,167	370
Revolving Loans Amortized Cost Basis	42,320	43,384
Financing Receivable, before Allowance for Credit Loss, Total	79,062	78,290
Commercial real estate
Credit quality
2021/2022	889,753	693,370
2020/2021	695,882	338,140
2019/2020	320,566	582,386
2018/2019	580,465	496,985
2017/2018	397,690	440,863
Prior	1,199,197	986,450
Revolving Loans Amortized Cost Basis	48,756	86,538
Revolving Loans Converted to Term Loans Amortized Cost Basis		14,891
Financing Receivable, before Allowance for Credit Loss, Total	4,132,309	3,639,623
Commercial real estate | Pass
Credit quality
2021/2022	889,583	693,370
2020/2021	695,882	338,140
2019/2020	319,838	533,887
2018/2019	565,587	487,739
2017/2018	395,474	415,186
Prior	1,173,163	940,732
Revolving Loans Amortized Cost Basis	48,081	78,479
Revolving Loans Converted to Term Loans Amortized Cost Basis		14,891
Financing Receivable, before Allowance for Credit Loss, Total	4,087,608	3,502,424
Commercial real estate | Special mention
Credit quality
2021/2022	170
2019/2020	555	48,499
2018/2019	14,878	7,470
2017/2018	512	25,513
Prior	11,398	30,255
Revolving Loans Amortized Cost Basis	675	7,600
Financing Receivable, before Allowance for Credit Loss, Total	28,188	119,337
Commercial real estate | Substandard
Credit quality
2019/2020	173
2018/2019		1,776
2017/2018	1,704	164
Prior	14,485	15,303
Revolving Loans Amortized Cost Basis		459
Financing Receivable, before Allowance for Credit Loss, Total	16,362	17,702
Commercial real estate | Other Indicator
Credit quality
Prior	151	160
Financing Receivable, before Allowance for Credit Loss, Total	151	160
Construction
Credit quality
2021/2022	154,158	181,393
2020/2021	282,875	116,642
2019/2020	101,109	214,875
2018/2019	99,422	160,689
2017/2018	92,778	65,454
Prior	87,390	51,264
Revolving Loans Amortized Cost Basis	26,911	23,652
Financing Receivable, before Allowance for Credit Loss, Total	844,643	813,969
Construction | Pass
Credit quality
2021/2022	124,464	154,558
2020/2021	261,536	107,767
2019/2020	96,423	210,314
2018/2019	97,000	155,311
2017/2018	88,973	62,770
Prior	84,704	48,021
Revolving Loans Amortized Cost Basis	25,957	22,859
Financing Receivable, before Allowance for Credit Loss, Total	779,057	761,600
Construction | Special mention
Credit quality
2019/2020		244
2018/2019	221	707
Prior		356
Financing Receivable, before Allowance for Credit Loss, Total	221	1,307
Construction | Substandard
Credit quality
2018/2019		363
2017/2018	21
Prior	490	839
Financing Receivable, before Allowance for Credit Loss, Total	511	1,202
Construction | Other Indicator
Credit quality
2021/2022	29,694	26,835
2020/2021	21,339	8,875
2019/2020	4,686	4,317
2018/2019	2,201	4,308
2017/2018	3,784	2,684
Prior	2,196	2,048
Revolving Loans Amortized Cost Basis	954	793
Financing Receivable, before Allowance for Credit Loss, Total	64,854	49,860
Lease financing
Credit quality
2021/2022	113,563	34,481
2020/2021	24,463	63,622
2019/2020	46,192	49,882
2018/2019	38,813	9,776
2017/2018	6,015	16,033
Prior	69,044	57,600
Financing Receivable, before Allowance for Credit Loss, Total	298,090	231,394
Lease financing | Pass
Credit quality
2021/2022	113,563	33,980
2020/2021	24,052	60,650
2019/2020	43,497	48,236
2018/2019	37,502	9,449
2017/2018	6,004	15,009
Prior	67,687	57,130
Financing Receivable, before Allowance for Credit Loss, Total	292,305	224,454
Lease financing | Special mention
Credit quality
2021/2022		501
2020/2021	411	2,702
2019/2020	2,498	1,506
2018/2019	1,299	311
2017/2018		153
Financing Receivable, before Allowance for Credit Loss, Total	4,208	5,173
Lease financing | Substandard
Credit quality
2020/2021		270
2019/2020	197	140
2018/2019	12	16
2017/2018	11	871
Prior	1,357	470
Financing Receivable, before Allowance for Credit Loss, Total	1,577	1,767
Commercial Lending
Credit quality
2021/2022	1,537,718	1,546,370
2020/2021	1,434,037	660,901
2019/2020	529,340	1,084,436
2018/2019	896,622	774,149
2017/2018	550,692	554,759
Prior	1,496,371	1,273,139
Revolving Loans Amortized Cost Basis	1,050,001	821,218
Revolving Loans Converted to Term Loans Amortized Cost Basis	16,158	57,113
Financing Receivable, before Allowance for Credit Loss, Total	$ 7,510,939	$ 6,772,085