Allowance for Credit Losses - Loan Balances by Year of Origination and Performing and Nonperforming Status (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	$ 1,271,764	$ 1,380,130
Year two	1,214,107	772,783
Year three	586,544	961,071
Year four	725,517	606,970
Year five	449,759	431,724
More than five years	1,528,088	1,591,979
Revolving	1,381,517	1,226,925
Revolving-Term	26,673	28,408
Total	7,183,969	6,999,990
Accruing TDRs
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	1,271,764	1,380,089
Year two	1,213,905	771,819
Year three	585,892	940,641
Year four	724,629	602,938
Year five	448,121	421,125
More than five years	1,513,912	1,564,501
Revolving	1,380,980	1,224,949
Revolving-Term	25,714	27,638
Total	7,164,917	6,933,699
Nonaccruing TDRs
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	41
Year two	202	964
Year three	652	20,430
Year four	888	4,032
Year five	1,638	10,599
More than five years	14,176	27,478
Revolving	537	1,976
Revolving-Term	959	770
Total	19,052	66,291
Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	292,732	385,347
Year two	360,423	317,359
Year three	269,049	468,720
Year four	449,493	334,743
Year five	261,941	266,019
More than five years	883,535	881,391
Revolving	21,666	36,948
Revolving-Term	0	0
Total	2,538,839	2,690,528
Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	253,696	437,529
Year two	289,448	126,371
Year three	88,544	134,417
Year four	73,998	86,912
Year five	65,911	41,422
More than five years	147,273	136,470
Revolving	591,522	550,402
Revolving-Term	0	0
Total	1,510,392	1,513,523
Commercial | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	120,655	142,321
Year two	170,691	110,562
Year three	40,762	113,532
Year four	14,442	16,838
Year five	3,953	989
More than five years	4,176	10,477
Revolving	27,284	30,036
Revolving-Term	0	0
Total	381,963	424,755
Commercial | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	287,679	257,409
Year two	233,723	108,048
Year three	91,149	144,976
Year four	109,731	115,228
Year five	84,889	81,889
More than five years	292,211	318,735
Revolving	105,271	108,230
Revolving-Term	1,291	1,179
Total	1,205,944	1,135,693
Commercial | Accruing TDRs | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	292,732	385,347
Year two	360,423	317,359
Year three	269,049	461,613
Year four	449,493	332,482
Year five	261,941	259,723
More than five years	876,435	865,567
Revolving	21,666	36,948
Revolving-Term	0	0
Total	2,531,739	2,659,039
Commercial | Accruing TDRs | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	253,696	437,529
Year two	289,448	126,371
Year three	88,544	123,944
Year four	73,998	86,852
Year five	65,858	38,540
More than five years	147,273	136,427
Revolving	591,292	548,622
Revolving-Term	0	0
Total	1,510,109	1,498,285
Commercial | Accruing TDRs | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	120,655	142,321
Year two	170,691	110,562
Year three	40,762	111,445
Year four	14,442	16,838
Year five	3,953	989
More than five years	3,792	10,093
Revolving	27,284	30,036
Revolving-Term	0	0
Total	381,579	422,284
Commercial | Accruing TDRs | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	287,679	257,368
Year two	233,656	107,984
Year three	91,149	144,689
Year four	109,479	113,820
Year five	83,689	81,195
More than five years	289,435	311,673
Revolving	105,172	108,202
Revolving-Term	1,195	1,122
Total	1,201,454	1,126,052
Commercial | Nonaccruing TDRs | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0
Year three	0	7,107
Year four	0	2,261
Year five	0	6,296
More than five years	7,100	15,824
Revolving	0	0
Revolving-Term	0	0
Total	7,100	31,488
Commercial | Nonaccruing TDRs | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	0
Year three	0	10,473
Year four	0	60
Year five	53	2,882
More than five years	0	43
Revolving	230	1,780
Revolving-Term	0	0
Total	283	15,239
Commercial | Nonaccruing TDRs | Commercial construction
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	0
Year three	0	2,087
Year four	0	0
Year five	0	0
More than five years	384	384
Revolving	0	0
Revolving-Term	0	0
Total	384	2,471
Commercial | Nonaccruing TDRs | Business banking
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	41
Year two	67	64
Year three	0	287
Year four	252	1,408
Year five	1,200	694
More than five years	2,776	7,062
Revolving	99	28
Revolving-Term	96	57
Total	4,490	9,641
Consumer | Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	296,948	137,465
Year two	149,003	100,995
Year three	91,613	92,165
Year four	74,583	50,156
Year five	32,031	40,384
More than five years	200,169	238,462
Revolving	553,649	443,406
Revolving-Term	23,957	24,552
Total	1,421,953	1,127,585
Consumer | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	20,054	20,059
Year two	10,819	9,448
Year three	5,427	7,261
Year four	3,270	3,093
Year five	1,034	1,021
More than five years	724	6,444
Revolving	82,125	57,903
Revolving-Term	1,425	2,677
Total	124,878	107,906
Consumer | Accruing TDRs | Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	296,948	137,465
Year two	148,868	100,253
Year three	91,085	91,689
Year four	73,947	49,853
Year five	31,646	39,657
More than five years	196,384	234,297
Revolving	553,441	443,238
Revolving-Term	23,108	23,839
Total	1,415,427	1,120,291
Consumer | Accruing TDRs | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	20,054	20,059
Year two	10,819	9,290
Year three	5,303	7,261
Year four	3,270	3,093
Year five	1,034	1,021
More than five years	593	6,444
Revolving	82,125	57,903
Revolving-Term	1,411	2,677
Total	124,609	107,748
Consumer | Nonaccruing TDRs | Consumer real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	135	742
Year three	528	476
Year four	636	303
Year five	385	727
More than five years	3,785	4,165
Revolving	208	168
Revolving-Term	849	713
Total	6,526	7,294
Consumer | Nonaccruing TDRs | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Current fiscal year	0	0
Year two	0	158
Year three	124	0
Year four	0	0
Year five	0	0
More than five years	131	0
Revolving	0	0
Revolving-Term	14	0
Total	$ 269	$ 158