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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
Mar. 31, 2024
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year $ 135,359 $ 1,117,436
Year two 1,138,128 1,320,936
Year three 1,309,559 1,094,225
Year four 1,059,734 503,703
Year five 485,560 645,502
More than five years 2,210,198 1,650,211
Revolving 1,287,473 1,292,135
Revolving-Term 30,023 29,193
Total 7,656,034 7,653,341
Accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 135,359 1,117,436
Year two 1,138,128 1,320,560
Year three 1,309,022 1,094,056
Year four 1,059,691 502,950
Year five 484,769 640,393
More than five years 2,180,694 1,635,979
Revolving 1,286,982 1,291,683
Revolving-Term 28,180 27,337
Total 7,622,825 7,630,394
Nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Year two 0 376
Year three 537 169
Year four 43 753
Year five 791 5,109
More than five years 29,504 14,232
Revolving 491 452
Revolving-Term 1,843 1,856
Total 33,209 22,947
Commercial Loans | Commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 25,970 276,677
Year two 281,115 324,469
Year three 351,226 439,308
Year four 464,794 240,256
Year five 228,899 419,371
More than five years 1,313,640 926,636
Revolving 34,138 32,418
Revolving-Term 0 0
Total 2,699,782 2,659,135
Commercial Loans | Commercial real estate | Accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 25,970 276,677
Year two 281,115 324,469
Year three 351,226 439,308
Year four 464,794 240,256
Year five 228,899 419,371
More than five years 1,296,487 920,316
Revolving 34,138 32,418
Revolving-Term 0 0
Total 2,682,629 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 0 0
Year four 0 0
Year five 0 0
More than five years 17,153 6,320
Revolving 0 0
Revolving-Term 0 0
Total 17,153 6,320
Commercial Loans | Commercial and industrial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 13,824 171,861
Year two 174,698 231,978
Year three 227,563 210,636
Year four 188,869 54,696
Year five 52,253 52,858
More than five years 228,371 193,905
Revolving 524,939 520,249
Revolving-Term 0 0
Total 1,410,517 1,436,183
Commercial Loans | Commercial and industrial | Accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 13,824 171,861
Year two 174,698 231,978
Year three 227,563 210,636
Year four 188,869 54,696
Year five 52,253 52,858
More than five years 227,989 193,257
Revolving 524,709 520,019
Revolving-Term 0 0
Total 1,409,905 1,435,305
Commercial Loans | Commercial and industrial | 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 0
More than five years 382 648
Revolving 230 230
Revolving-Term 0 0
Total 612 878
Commercial Loans | Commercial construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 13,086 75,596
Year two 90,954 154,456
Year three 141,982 82,313
Year four 65,353 14,845
Year five 14,758 4,727
More than five years 9,008 4,438
Revolving 12,234 14,208
Revolving-Term 0 0
Total 347,375 350,583
Commercial Loans | Commercial construction | Accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 13,086 75,596
Year two 90,954 154,456
Year three 141,982 82,313
Year four 65,353 14,845
Year five 14,758 151
More than five years 4,048 4,054
Revolving 12,234 14,208
Revolving-Term 0 0
Total 342,415 345,623
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 32,910 270,129
Year two 254,296 262,606
Year three 241,359 207,611
Year four 190,039 88,018
Year five 85,071 99,574
More than five years 407,132 334,766
Revolving 95,068 96,754
Revolving-Term 1,280 1,307
Total 1,307,155 1,360,765
Commercial Loans | Business banking | Accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 32,910 270,129
Year two 254,296 262,606
Year three 241,359 207,611
Year four 190,039 87,979
Year five 84,986 99,354
More than five years 403,333 330,902
Revolving 95,068 96,754
Revolving-Term 1,257 1,283
Total 1,303,248 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 0 0
Year four 0 39
Year five 85 220
More than five years 3,799 3,864
Revolving 0 0
Revolving-Term 23 24
Total 3,907 4,147
Consumer Loans | Consumer real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 46,543 311,887
Year two 327,577 335,462
Year three 336,640 147,850
Year four 145,121 102,041
Year five 101,308 67,890
More than five years 250,783 189,794
Revolving 549,482 552,080
Revolving-Term 25,519 24,774
Total 1,782,973 1,731,778
Consumer Loans | Consumer real estate | Accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 46,543 311,887
Year two 327,577 335,086
Year three 336,103 147,689
Year four 145,084 101,518
Year five 100,671 67,577
More than five years 247,704 186,909
Revolving 549,221 551,858
Revolving-Term 23,699 22,942
Total 1,776,602 1,725,466
Consumer Loans | Consumer real estate | Nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Year two 0 376
Year three 537 161
Year four 37 523
Year five 637 313
More than five years 3,079 2,885
Revolving 261 222
Revolving-Term 1,820 1,832
Total 6,371 6,312
Consumer Loans | Other consumer    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 3,026 11,286
Year two 9,488 11,965
Year three 10,789 6,507
Year four 5,558 3,847
Year five 3,271 1,082
More than five years 1,264 672
Revolving 71,612 76,426
Revolving-Term 3,224 3,112
Total 108,232 114,897
Consumer Loans | Other consumer | Accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 3,026 11,286
Year two 9,488 11,965
Year three 10,789 6,499
Year four 5,552 3,656
Year five 3,202 1,082
More than five years 1,133 541
Revolving 71,612 76,426
Revolving-Term 3,224 3,112
Total 108,026 114,567
Consumer Loans | Other consumer | Nonaccrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current fiscal year 0 0
Year two 0 0
Year three 0 8
Year four 6 191
Year five 69 0
More than five years 131 131
Revolving 0 0
Revolving-Term 0 0
Total $ 206 $ 330