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Allowance for Credit Losses - Loan Balances by Year of Origination and Internally Assigned Risk Rating (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year $ 287,583 $ 1,380,130
Year two 1,310,234 772,783
Year three 725,508 961,071
Year four 880,093 606,970
Year five 558,798 431,724
More than five years 1,854,855 1,591,979
Revolving 1,317,892 1,226,925
Revolving-Term 28,948 28,408
Total 6,963,911 6,999,990
Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 287,543 1,379,856
Year two 1,310,008 768,961
Year three 720,453 879,574
Year four 811,828 576,166
Year five 527,057 370,013
More than five years 1,600,692 1,361,826
Revolving 1,298,915 1,209,363
Revolving-Term 25,288 24,964
Total 6,581,784 6,570,723
Special mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 150
Year two 142 151
Year three 1,313 42,832
Year four 35,809 10,312
Year five 7,853 41,574
More than five years 112,503 88,094
Revolving 10,023 9,047
Revolving-Term 110 111
Total 167,753 192,271
Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 40 124
Year two 84 3,671
Year three 3,742 36,888
Year four 27,950 20,492
Year five 23,888 20,137
More than five years 141,655 142,059
Revolving 8,954 8,515
Revolving-Term 3,550 3,333
Total 209,863 235,219
Doubtful    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Year two 0 0
Year three 0 1,777
Year four 4,506 0
Year five 0 0
More than five years 5 0
Revolving 0 0
Revolving-Term 0 0
Total 4,511 1,777
Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 5,331,863 5,406,584
Commercial | Commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 92,158 385,347
Year two 367,329 317,359
Year three 335,124 468,720
Year four 462,811 334,743
Year five 328,712 266,019
More than five years 1,083,184 881,391
Revolving 36,481 36,948
Revolving-Term 0 0
Total 2,705,799 2,690,528
Commercial | Commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 42,350 437,529
Year two 369,108 126,371
Year three 107,500 134,417
Year four 113,383 86,912
Year five 79,411 41,422
More than five years 162,305 136,470
Revolving 584,449 550,402
Revolving-Term 0 0
Total 1,458,506 1,513,523
Commercial | Commercial construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 24,551 142,321
Year two 161,638 110,562
Year three 72,342 113,532
Year four 77,597 16,838
Year five 4,988 989
More than five years 11,095 10,477
Revolving 31,026 30,036
Revolving-Term 0 0
Total 383,237 424,755
Commercial | Business banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 66,205 257,409
Year two 255,151 108,048
Year three 105,295 144,976
Year four 135,148 115,228
Year five 106,319 81,889
More than five years 361,297 318,735
Revolving 110,593 108,230
Revolving-Term 1,228 1,179
Total 1,141,236 1,135,693
Commercial | Pass | Commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 92,158 385,347
Year two 367,329 316,003
Year three 333,477 412,191
Year four 423,653 314,303
Year five 308,371 213,019
More than five years 878,459 698,992
Revolving 34,981 35,448
Revolving-Term 0 0
Total 2,438,428 2,375,303
Commercial | Pass | Commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 42,350 437,483
Year two 369,064 126,371
Year three 106,684 115,359
Year four 94,211 83,030
Year five 75,757 37,176
More than five years 157,096 132,182
Revolving 569,064 536,554
Revolving-Term 0 0
Total 1,414,226 1,468,155
Commercial | Pass | Commercial construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 24,551 142,321
Year two 161,638 108,405
Year three 70,185 111,512
Year four 73,539 16,838
Year five 4,984 989
More than five years 4,281 3,539
Revolving 31,026 30,036
Revolving-Term 0 0
Total 370,204 413,640
Commercial | Pass | Business banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 66,205 257,264
Year two 255,051 107,791
Year three 104,999 141,411
Year four 129,574 110,586
Year five 100,316 79,187
More than five years 336,209 293,215
Revolving 109,505 107,093
Revolving-Term 505 443
Total 1,102,364 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 304 37,786
Year four 25,293 6,401
Year five 2,634 40,445
More than five years 100,061 75,938
Revolving 0 0
Revolving-Term 0 0
Total 128,292 160,570
Commercial | Special mention | Commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 46
Year two 44 0
Year three 816 3,060
Year four 4,012 2,546
Year five 2,366 72
More than five years 1,137 832
Revolving 9,862 8,887
Revolving-Term 0 0
Total 18,237 15,443
Commercial | Special mention | Commercial construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Year two 0 0
Year three 0 0
Year four 3,578 0
Year five 0 0
More than five years 4,423 4,458
Revolving 0 0
Revolving-Term 0 0
Total 8,001 4,458
Commercial | Special mention | Business banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 104
Year two 98 151
Year three 193 1,986
Year four 2,926 1,365
Year five 2,853 1,057
More than five years 5,959 5,929
Revolving 161 160
Revolving-Term 110 111
Total 12,300 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 1,343 18,743
Year four 13,865 14,039
Year five 17,707 12,555
More than five years 104,659 106,461
Revolving 1,500 1,500
Revolving-Term 0 0
Total 139,074 154,654
Commercial | Substandard | Commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Year two 0 0
Year three 0 14,221
Year four 10,654 1,336
Year five 1,288 4,174
More than five years 4,072 3,456
Revolving 5,523 4,961
Revolving-Term 0 0
Total 21,537 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 2,157 2,020
Year four 480 0
Year five 4 0
More than five years 2,391 2,480
Revolving 0 0
Revolving-Term 0 0
Total 5,032 6,657
Commercial | Substandard | Business banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 41
Year two 2 106
Year three 103 1,579
Year four 2,648 3,277
Year five 3,150 1,645
More than five years 19,129 19,591
Revolving 927 977
Revolving-Term 613 625
Total 26,572 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 5 0
Revolving 0 0
Revolving-Term 0 0
Total 5 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 4,506 0
Year five 0 0
More than five years 0 0
Revolving 0 0
Revolving-Term 0 0
Total 4,506 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 0 0
Revolving 0 0
Revolving-Term 0 0
Total 0 0
Consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 1,632,048 1,593,406
Consumer | Business banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total   357,900
Consumer | Consumer real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 56,284 137,465
Year two 141,486 100,995
Year three 97,071 92,165
Year four 85,206 50,156
Year five 36,916 40,384
More than five years 235,623 238,462
Revolving 483,849 443,406
Revolving-Term 26,422 24,552
Total 1,162,857 1,127,585
Consumer | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 6,035 20,059
Year two 15,522 9,448
Year three 8,176 7,261
Year four 5,948 3,093
Year five 2,452 1,021
More than five years 1,351 6,444
Revolving 71,494 57,903
Revolving-Term 1,298 2,677
Total 112,276 107,906
Consumer | Pass | Consumer real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 56,244 137,465
Year two 141,404 100,995
Year three 96,932 91,981
Year four 84,920 48,531
Year five 35,181 39,029
More than five years 223,298 231,861
Revolving 482,845 442,530
Revolving-Term 23,510 23,391
Total 1,144,334 1,115,783
Consumer | Pass | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 6,035 19,976
Year two 15,522 9,396
Year three 8,176 7,120
Year four 5,931 2,878
Year five 2,448 613
More than five years 1,349 2,037
Revolving 71,494 57,702
Revolving-Term 1,273 1,130
Total 112,228 100,852
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 923 937
Revolving 0 0
Revolving-Term 0 0
Total 923 937
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 40 0
Year two 82 0
Year three 139 184
Year four 286 1,625
Year five 1,735 1,355
More than five years 11,402 5,664
Revolving 1,004 876
Revolving-Term 2,912 1,161
Total 17,600 10,865
Consumer | Substandard | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 83
Year two 0 52
Year three 0 141
Year four 17 215
Year five 4 408
More than five years 2 4,407
Revolving 0 201
Revolving-Term 25 1,547
Total 48 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