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Allowance for Credit Losses - Loan Balances by Year of Origination and Internally Assigned Risk Rating (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
Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 1,271,177 1,379,856
Year two 1,177,280 768,961
Year three 581,879 879,574
Year four 677,616 576,166
Year five 406,053 370,013
More than five years 1,313,942 1,361,826
Revolving 1,348,200 1,209,363
Revolving-Term 23,596 24,964
Total 6,799,743 6,570,723
Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 150
Year two 36,547 151
Year three 146 42,832
Year four 26,394 10,312
Year five 24,765 41,574
More than five years 113,071 88,094
Revolving 20,073 9,047
Revolving-Term 95 111
Total 221,091 192,271
Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 587 124
Year two 280 3,671
Year three 4,519 36,888
Year four 21,507 20,492
Year five 18,941 20,137
More than five years 101,043 142,059
Revolving 13,244 8,515
Revolving-Term 2,982 3,333
Total 163,103 235,219
Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Year two 0 0
Year three 0 1,777
Year four 0 0
Year five 0 0
More than five years 32 0
Revolving 0 0
Revolving-Term 0 0
Total 32 1,777
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 | Pass | Commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 292,732 385,347
Year two 360,423 316,003
Year three 267,743 412,191
Year four 422,872 314,303
Year five 227,006 213,019
More than five years 704,600 698,992
Revolving 21,666 35,448
Revolving-Term 0 0
Total 2,297,042 2,375,303
Commercial | Pass | Commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 253,324 437,483
Year two 264,012 126,371
Year three 88,544 115,359
Year four 63,190 83,030
Year five 62,874 37,176
More than five years 138,250 132,182
Revolving 559,777 536,554
Revolving-Term 0 0
Total 1,429,971 1,468,155
Commercial | Pass | Commercial construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 120,655 142,321
Year two 159,737 108,405
Year three 40,762 111,512
Year four 6,338 16,838
Year five 3,953 989
More than five years 2,297 3,539
Revolving 27,284 30,036
Revolving-Term 0 0
Total 361,026 413,640
Commercial | Pass | Business banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 287,520 257,264
Year two 233,499 107,791
Year three 87,926 141,411
Year four 107,819 110,586
Year five 80,549 79,187
More than five years 276,843 293,215
Revolving 104,354 107,093
Revolving-Term 645 443
Total 1,179,155 1,096,990
Commercial | Special Mention | Commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Year two 0 0
Year three 0 37,786
Year four 13,187 6,401
Year five 20,090 40,445
More than five years 101,112 75,938
Revolving 0 0
Revolving-Term 0 0
Total 134,389 160,570
Commercial | Special Mention | Commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 46
Year two 25,436 0
Year three 0 3,060
Year four 5,103 2,546
Year five 1,885 72
More than five years 7,132 832
Revolving 19,280 8,887
Revolving-Term 0 0
Total 58,836 15,443
Commercial | Special Mention | Commercial construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Year two 10,954 0
Year three 0 0
Year four 8,104 0
Year five 0 0
More than five years 0 4,458
Revolving 0 0
Revolving-Term 0 0
Total 19,058 4,458
Commercial | Special Mention | Business banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 104
Year two 157 151
Year three 146 1,986
Year four 0 1,365
Year five 2,790 1,057
More than five years 3,945 5,929
Revolving 793 160
Revolving-Term 95 111
Total 7,926 10,863
Commercial | Substandard | Commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Year two 0 1,356
Year three 1,306 18,743
Year four 13,434 14,039
Year five 14,845 12,555
More than five years 77,823 106,461
Revolving 0 1,500
Revolving-Term 0 0
Total 107,408 154,654
Commercial | Substandard | Commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 372 0
Year two 0 0
Year three 0 14,221
Year four 5,705 1,336
Year five 1,152 4,174
More than five years 1,891 3,456
Revolving 12,465 4,961
Revolving-Term 0 0
Total 21,585 28,148
Commercial | Substandard | Commercial construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Year two 0 2,157
Year three 0 2,020
Year four 0 0
Year five 0 0
More than five years 1,879 2,480
Revolving 0 0
Revolving-Term 0 0
Total 1,879 6,657
Commercial | Substandard | Business banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 159 41
Year two 67 106
Year three 3,077 1,579
Year four 1,912 3,277
Year five 1,550 1,645
More than five years 11,391 19,591
Revolving 124 977
Revolving-Term 551 625
Total 18,831 27,841
Commercial | Doubtful | Commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Year two 0 0
Year three 0 0
Year four 0 0
Year five 0 0
More than five years 0 0
Revolving 0 0
Revolving-Term 0 0
Total 0 0
Commercial | Doubtful | Commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Year two 0 0
Year three 0 1,777
Year four 0 0
Year five 0 0
More than five years 0 0
Revolving 0 0
Revolving-Term 0 0
Total 0 1,777
Commercial | Doubtful | Commercial construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Year two 0 0
Year three 0 0
Year four 0 0
Year five 0 0
More than five years 0 0
Revolving 0 0
Revolving-Term 0 0
Total 0 0
Commercial | Doubtful | Business banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Year two 0 0
Year three 0 0
Year four 0 0
Year five 0 0
More than five years 32 0
Revolving 0 0
Revolving-Term 0 0
Total 32 0
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 | Pass | Consumer real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 296,900 137,465
Year two 148,790 100,995
Year three 91,477 91,981
Year four 74,155 48,531
Year five 30,658 39,029
More than five years 191,228 231,861
Revolving 552,994 442,530
Revolving-Term 21,547 23,391
Total 1,407,749 1,115,783
Consumer | Pass | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 20,046 19,976
Year two 10,819 9,396
Year three 5,427 7,120
Year four 3,242 2,878
Year five 1,013 613
More than five years 724 2,037
Revolving 82,125 57,702
Revolving-Term 1,404 1,130
Total 124,800 100,852
Consumer | Special Mention | Consumer real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Year two 0 0
Year three 0 0
Year four 0 0
Year five 0 0
More than five years 882 937
Revolving 0 0
Revolving-Term 0 0
Total 882 937
Consumer | Special Mention | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Year two 0 0
Year three 0 0
Year four 0 0
Year five 0 0
More than five years 0 0
Revolving 0 0
Revolving-Term 0 0
Total 0 0
Consumer | Substandard | Consumer real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 48 0
Year two 213 0
Year three 136 184
Year four 428 1,625
Year five 1,373 1,355
More than five years 8,059 5,664
Revolving 655 876
Revolving-Term 2,410 1,161
Total 13,322 10,865
Consumer | Substandard | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 8 83
Year two 0 52
Year three 0 141
Year four 28 215
Year five 21 408
More than five years 0 4,407
Revolving 0 201
Revolving-Term 21 1,547
Total 78 7,054
Consumer | Doubtful | Consumer real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Year two 0 0
Year three 0 0
Year four 0 0
Year five 0 0
More than five years 0 0
Revolving 0 0
Revolving-Term 0 0
Total 0 0
Consumer | Doubtful | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Year two 0 0
Year three 0 0
Year four 0 0
Year five 0 0
More than five years 0 0
Revolving 0 0
Revolving-Term 0 0
Total $ 0 $ 0