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Portfolio Loans - Risk grades of portfolio loans, further sorted by origination year (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 $ 1,305,716 $ 2,288,440
2023, charge-off 4  
2022 / 2021 1,877,528 1,926,481
2022, charge-off 76  
2021 / 2020 1,647,750 962,405
2021, charge-off 577  
2020 / 2019 775,934 558,294
2020, charge-off 30  
2019 / 2018 498,204 323,245
2019, charge-off 617  
Prior 771,673 644,140
Prior, charge-off 2,339  
Revolving Loans 979,355 1,022,697
Revolving Loans, charge-off 0  
Total 7,856,160 7,725,702
Total, gross write-offs 3,643  
Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 7,005,508 6,964,678
Watch    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 721,586 563,897
Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 70,118 91,405
Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 47,650 90,655
Substandard Non-accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 11,298 15,067
Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 401,852 544,993
2023, charge-off 0  
2022 / 2021 316,757 320,898
2022, charge-off 0  
2021 / 2020 230,222 142,171
2021, charge-off 420  
2020 / 2019 101,371 67,027
2020, charge-off 0  
2019 / 2018 51,586 55,404
2019, charge-off 316  
Prior 186,358 159,475
Prior, charge-off 997  
Revolving Loans 655,303 684,186
Revolving Loans, charge-off 0  
Total 1,943,449 1,974,154
Total, gross write-offs 1,733  
Commercial | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 279,467 479,893
2022 / 2021 255,619 266,122
2021 / 2020 181,603 136,445
2020 / 2019 74,600 52,046
2019 / 2018 39,483 50,764
Prior 152,523 135,000
Revolving Loans 550,267 548,225
Total 1,533,562 1,668,495
Commercial | Watch    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 112,285 54,195
2022 / 2021 59,685 49,382
2021 / 2020 44,244 3,288
2020 / 2019 25,119 7,201
2019 / 2018 7,526 1,258
Prior 24,532 2,160
Revolving Loans 77,429 84,274
Total 350,820 201,758
Commercial | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 616 1,958
2022 / 2021 541 937
2021 / 2020 651 1,642
2020 / 2019 1,104 974
2019 / 2018 499 1,000
Prior 6,937 17,024
Revolving Loans 14,357 23,005
Total 24,705 46,540
Commercial | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 8,901 8,926
2022 / 2021 912 1,165
2021 / 2020 1,119 570
2020 / 2019 445 6,671
2019 / 2018 3,948 2,382
Prior 1,859 5,191
Revolving Loans 11,550 26,282
Total 28,734 51,187
Commercial | Substandard Non-accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 583 21
2022 / 2021 0 3,292
2021 / 2020 2,605 226
2020 / 2019 103 135
2019 / 2018 130 0
Prior 507 100
Revolving Loans 1,700 2,400
Total 5,628 6,174
Commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 456,269 978,317
2023, charge-off 0  
2022 / 2021 898,639 898,122
2022, charge-off 0  
2021 / 2020 862,943 558,607
2021, charge-off 0  
2020 / 2019 444,723 397,516
2020, charge-off 0  
2019 / 2018 366,956 201,813
2019, charge-off 239  
Prior 300,836 209,715
Prior, charge-off 936  
Revolving Loans 23,387 17,783
Revolving Loans, charge-off 0  
Total 3,353,753 3,261,873
Total, gross write-offs 1,175  
Commercial real estate | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 352,661 883,688
2022 / 2021 850,371 819,133
2021 / 2020 778,662 478,452
2020 / 2019 404,109 297,525
2019 / 2018 281,889 161,409
Prior 258,207 198,419
Revolving Loans 18,292 13,083
Total 2,944,191 2,851,709
Commercial real estate | Watch    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 82,748 77,346
2022 / 2021 45,945 56,113
2021 / 2020 69,450 64,282
2020 / 2019 33,694 96,664
2019 / 2018 79,906 21,592
Prior 34,700 5,758
Revolving Loans 5,051 4,700
Total 351,494 326,455
Commercial real estate | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 18,753 11,943
2022 / 2021 1,597 5,389
2021 / 2020 13,762 12,386
2020 / 2019 3,908 1,420
2019 / 2018 3,330 6,917
Prior 3,421 5,471
Revolving Loans 0 0
Total 44,771 43,526
Commercial real estate | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 1,882 5,340
2022 / 2021 193 13,528
2021 / 2020 904 3,454
2020 / 2019 2,987 1,907
2019 / 2018 1,831 10,248
Prior 3,898 62
Revolving Loans 44 0
Total 11,739 34,539
Commercial real estate | Substandard Non-accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 225 0
2022 / 2021 533 3,959
2021 / 2020 165 33
2020 / 2019 25 0
2019 / 2018 0 1,647
Prior 610 5
Revolving Loans 0 0
Total 1,558 5,644
Real estate construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 159,315 230,042
2022 / 2021 176,353 203,743
2021 / 2020 105,216 71,184
2020 / 2019 58,157 1,539
2019 / 2018 1,407 1,901
Prior 3,899 3,149
Revolving Loans 23,251 18,911
Total 527,598 530,469
Real estate construction | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 152,897 219,112
2022 / 2021 171,900 191,724
2021 / 2020 104,963 68,015
2020 / 2019 54,943 1,490
2019 / 2018 1,365 1,901
Prior 3,899 1,751
Revolving Loans 23,251 18,911
Total 513,218 502,904
Real estate construction | Watch    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 1,065 8,530
2022 / 2021 4,453 12,019
2021 / 2020 253 3,169
2020 / 2019 3,214 48
2019 / 2018 42 0
Prior 0 1,398
Revolving Loans 0 0
Total 9,027 25,164
Real estate construction | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022   0
2022 / 2021   0
2021 / 2020   0
2020 / 2019   1
2019 / 2018   0
Prior   0
Revolving Loans   0
Total 0 1
Real estate construction | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 5,353 2,400
2022 / 2021 0 0
2021 / 2020 0 0
2020 / 2019 0 0
2019 / 2018 0 0
Prior 0 0
Revolving Loans 0 0
Total 5,353 2,400
Real estate construction | Substandard Non-accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 0 0
Retail real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 202,184 400,507
2023, charge-off 0  
2022 / 2021 382,882 460,072
2022, charge-off 5  
2021 / 2020 423,392 177,299
2021, charge-off 0  
2020 / 2019 163,508 79,126
2020, charge-off 29  
2019 / 2018 71,864 58,481
2019, charge-off 62  
Prior 279,040 270,808
Prior, charge-off 156  
Revolving Loans 192,575 210,789
Revolving Loans, charge-off 0  
Total 1,715,445 1,657,082
Total, gross write-offs 252  
Retail real estate | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 201,140 396,547
2022 / 2021 379,512 456,158
2021 / 2020 420,164 175,148
2020 / 2019 162,295 77,569
2019 / 2018 71,102 56,887
Prior 274,617 267,387
Revolving Loans 189,862 209,903
Total 1,698,692 1,639,599
Retail real estate | Watch    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 767 2,928
2022 / 2021 2,704 2,991
2021 / 2020 2,877 1,846
2020 / 2019 973 1,444
2019 / 2018 579 1,063
Prior 596 27
Revolving Loans 1,749 221
Total 10,245 10,520
Retail real estate | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 204 945
2022 / 2021 55 0
2021 / 2020 0 0
2020 / 2019 0 0
2019 / 2018 0 0
Prior 383 393
Revolving Loans 0 0
Total 642 1,338
Retail real estate | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 73 77
2022 / 2021 73 732
2021 / 2020 295 198
2020 / 2019 53 81
2019 / 2018 82 141
Prior 1,010 1,293
Revolving Loans 238 7
Total 1,824 2,529
Retail real estate | Substandard Non-accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 0 10
2022 / 2021 538 191
2021 / 2020 56 107
2020 / 2019 187 32
2019 / 2018 101 390
Prior 2,434 1,708
Revolving Loans 726 658
Total 4,042 3,096
Retail other    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 86,096 134,581
2023, charge-off 4  
2022 / 2021 102,897 43,646
2022, charge-off 71  
2021 / 2020 25,977 13,144
2021, charge-off 157  
2020 / 2019 8,175 13,086
2020, charge-off 1  
2019 / 2018 6,391 5,646
2019, charge-off 0  
Prior 1,540 993
Prior, charge-off 250  
Revolving Loans 84,839 91,028
Revolving Loans, charge-off 0  
Total 315,915 302,124
Total, gross write-offs 483  
Retail other | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 86,096 134,567
2022 / 2021 102,834 43,512
2021 / 2020 25,977 13,141
2020 / 2019 8,172 13,086
2019 / 2018 6,388 5,646
Prior 1,539 991
Revolving Loans 84,839 91,028
Total 315,845 301,971
Retail other | Watch    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 0 0
Retail other | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 0 0
Retail other | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 0 0
Retail other | Substandard Non-accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 0 14
2022 / 2021 63 134
2021 / 2020 0 3
2020 / 2019 3 0
2019 / 2018 3 0
Prior 1 2
Revolving Loans 0 0
Total $ 70 $ 153