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Loans and Allowance for Credit Losses - Loan Balances by Year of Origination and Performing and Nonperforming Status (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year $ 307,409 $ 1,117,436
Year two 1,160,151 1,320,936
Year three 1,289,981 1,094,225
Year four 1,029,790 503,703
Year five 469,249 645,502
More than five years 2,144,757 1,650,211
Revolving 1,279,143 1,292,135
Revolving-Term 33,090 29,193
Total 7,713,570 7,653,341
Accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 307,409 1,117,436
Year two 1,159,541 1,320,560
Year three 1,288,416 1,094,056
Year four 1,029,442 502,950
Year five 468,366 640,393
More than five years 2,119,958 1,635,979
Revolving 1,274,369 1,291,683
Revolving-Term 31,212 27,337
Total 7,678,713 7,630,394
Nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Year two 610 376
Year three 1,565 169
Year four 348 753
Year five 883 5,109
More than five years 24,799 14,232
Revolving 4,774 452
Revolving-Term 1,878 1,856
Total 34,857 22,947
Commercial Loans | Commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 48,148 276,677
Year two 278,373 324,469
Year three 373,948 439,308
Year four 451,757 240,256
Year five 222,926 419,371
More than five years 1,266,748 926,636
Revolving 30,627 32,418
Revolving-Term 0 0
Total 2,672,527 2,659,135
Commercial Loans | Commercial real estate | Accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 48,148 276,677
Year two 278,373 324,469
Year three 372,954 439,308
Year four 451,757 240,256
Year five 222,926 419,371
More than five years 1,253,370 920,316
Revolving 30,627 32,418
Revolving-Term 0 0
Total 2,658,155 2,652,815
Commercial Loans | Commercial real estate | Nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Year two 0 0
Year three 994 0
Year four 0 0
Year five 0 0
More than five years 13,378 6,320
Revolving 0 0
Revolving-Term 0 0
Total 14,372 6,320
Commercial Loans | Commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 33,977 171,861
Year two 177,447 231,978
Year three 220,542 210,636
Year four 178,820 54,696
Year five 48,888 52,858
More than five years 236,343 193,905
Revolving 525,938 520,249
Revolving-Term 0 0
Total 1,421,955 1,436,183
Commercial Loans | Commercial and industrial | Accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 33,977 171,861
Year two 177,317 231,978
Year three 220,542 210,636
Year four 178,477 54,696
Year five 48,888 52,858
More than five years 236,335 193,257
Revolving 521,687 520,019
Revolving-Term 0 0
Total 1,417,223 1,435,305
Commercial Loans | Commercial and industrial | Nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Year two 130 0
Year three 0 0
Year four 343 0
Year five 0 0
More than five years 8 648
Revolving 4,251 230
Revolving-Term 0 0
Total 4,732 878
Commercial Loans | Commercial construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 31,952 75,596
Year two 110,187 154,456
Year three 124,661 82,313
Year four 67,115 14,845
Year five 14,490 4,727
More than five years 8,850 4,438
Revolving 10,432 14,208
Revolving-Term 0 0
Total 367,687 350,583
Commercial Loans | Commercial construction | Accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 31,952 75,596
Year two 110,187 154,456
Year three 124,661 82,313
Year four 67,115 14,845
Year five 14,490 151
More than five years 3,890 4,054
Revolving 10,432 14,208
Revolving-Term 0 0
Total 362,727 345,623
Commercial Loans | Commercial construction | Nonaccrual    
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 4,576
More than five years 4,960 384
Revolving 0 0
Revolving-Term 0 0
Total 4,960 4,960
Commercial Loans | Business banking    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 77,648 270,129
Year two 250,347 262,606
Year three 232,655 207,611
Year four 185,121 88,018
Year five 81,831 99,574
More than five years 386,719 334,766
Revolving 92,819 96,754
Revolving-Term 1,845 1,307
Total 1,308,985 1,360,765
Commercial Loans | Business banking | Accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 77,648 270,129
Year two 250,347 262,606
Year three 232,460 207,611
Year four 185,121 87,979
Year five 81,697 99,354
More than five years 383,427 330,902
Revolving 92,819 96,754
Revolving-Term 1,810 1,283
Total 1,305,329 1,356,618
Commercial Loans | Business banking | Nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Year two 0 0
Year three 195 0
Year four 0 39
Year five 134 220
More than five years 3,292 3,864
Revolving 0 0
Revolving-Term 35 24
Total 3,656 4,147
Consumer Loans | Consumer real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 110,596 311,887
Year two 335,218 335,462
Year three 328,746 147,850
Year four 142,185 102,041
Year five 98,454 67,890
More than five years 245,129 189,794
Revolving 552,467 552,080
Revolving-Term 26,961 24,774
Total 1,839,756 1,731,778
Consumer Loans | Consumer real estate | Accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 110,596 311,887
Year two 334,745 335,086
Year three 328,370 147,689
Year four 142,185 101,518
Year five 97,774 67,577
More than five years 242,117 186,909
Revolving 551,944 551,858
Revolving-Term 25,118 22,942
Total 1,832,849 1,725,466
Consumer Loans | Consumer real estate | Nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Year two 473 376
Year three 376 161
Year four 0 523
Year five 680 313
More than five years 3,012 2,885
Revolving 523 222
Revolving-Term 1,843 1,832
Total 6,907 6,312
Consumer Loans | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 5,088 11,286
Year two 8,579 11,965
Year three 9,429 6,507
Year four 4,792 3,847
Year five 2,660 1,082
More than five years 968 672
Revolving 66,860 76,426
Revolving-Term 4,284 3,112
Total 102,660 114,897
Consumer Loans | Other consumer | Accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 5,088 11,286
Year two 8,572 11,965
Year three 9,429 6,499
Year four 4,787 3,656
Year five 2,591 1,082
More than five years 819 541
Revolving 66,860 76,426
Revolving-Term 4,284 3,112
Total 102,430 114,567
Consumer Loans | Other consumer | Nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Year two 7 0
Year three 0 8
Year four 5 191
Year five 69 0
More than five years 149 131
Revolving 0 0
Revolving-Term 0 0
Total $ 230 $ 330