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Portfolio Loans - Risk grades of portfolio loans, further sorted by origination year (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 $ 975,452 $ 2,288,440
2023, charge-off 2  
2022 / 2021 1,929,698 1,926,481
2022, charge-off 69  
2021 / 2020 1,742,054 962,405
2021, charge-off 557  
2020 / 2019 811,748 558,294
2020, charge-off 30  
2019 / 2018 524,158 323,245
2019, charge-off 153  
Prior 871,850 644,140
Prior, charge-off 1,717  
Revolving Loans 950,324 1,022,697
Revolving Loans, charge-off 0  
Total 7,805,284 7,725,702
Total, gross write-offs 2,528  
Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 7,017,721 6,964,678
Watch    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 630,993 563,897
Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 75,272 91,405
Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 66,089 90,655
Substandard Non-accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 15,209 15,067
Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 299,699 544,993
2023, charge-off 0  
2022 / 2021 327,168 320,898
2022, charge-off 0  
2021 / 2020 261,008 142,171
2021, charge-off 420  
2020 / 2019 109,854 67,027
2020, charge-off 0  
2019 / 2018 64,727 55,404
2019, charge-off 16  
Prior 216,213 159,475
Prior, charge-off 539  
Revolving Loans 621,049 684,186
Revolving Loans, charge-off 0  
Total 1,899,718 1,974,154
Total, gross write-offs 975  
Commercial | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 238,885 479,893
2022 / 2021 258,601 266,122
2021 / 2020 210,737 136,445
2020 / 2019 84,565 52,046
2019 / 2018 52,048 50,764
Prior 189,011 135,000
Revolving Loans 518,785 548,225
Total 1,552,632 1,668,495
Commercial | Watch    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 53,019 54,195
2022 / 2021 66,345 49,382
2021 / 2020 45,506 3,288
2020 / 2019 23,440 7,201
2019 / 2018 6,017 1,258
Prior 15,102 2,160
Revolving Loans 58,154 84,274
Total 267,583 201,758
Commercial | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 1,081 1,958
2022 / 2021 1,166 937
2021 / 2020 786 1,642
2020 / 2019 1,175 974
2019 / 2018 2,362 1,000
Prior 7,047 17,024
Revolving Loans 16,911 23,005
Total 30,528 46,540
Commercial | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 5,664 8,926
2022 / 2021 1,056 1,165
2021 / 2020 1,182 570
2020 / 2019 490 6,671
2019 / 2018 4,168 2,382
Prior 5,053 5,191
Revolving Loans 25,199 26,282
Total 42,812 51,187
Commercial | Substandard Non-accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 1,050 21
2022 / 2021 0 3,292
2021 / 2020 2,797 226
2020 / 2019 184 135
2019 / 2018 132 0
Prior 0 100
Revolving Loans 2,000 2,400
Total 6,163 6,174
Commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 350,513 978,317
2023, charge-off 0  
2022 / 2021 907,148 898,122
2022, charge-off 0  
2021 / 2020 884,710 558,607
2021, charge-off 0  
2020 / 2019 465,915 397,516
2020, charge-off 0  
2019 / 2018 374,891 201,813
2019, charge-off 137  
Prior 355,765 209,715
Prior, charge-off 936  
Revolving Loans 22,366 17,783
Revolving Loans, charge-off 0  
Total 3,361,308 3,261,873
Total, gross write-offs 1,073  
Commercial real estate | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 275,324 883,688
2022 / 2021 862,753 819,133
2021 / 2020 800,484 478,452
2020 / 2019 412,069 297,525
2019 / 2018 290,406 161,409
Prior 296,497 198,419
Revolving Loans 16,636 13,083
Total 2,954,169 2,851,709
Commercial real estate | Watch    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 64,094 77,346
2022 / 2021 41,392 56,113
2021 / 2020 64,833 64,282
2020 / 2019 36,255 96,664
2019 / 2018 79,265 21,592
Prior 50,306 5,758
Revolving Loans 5,680 4,700
Total 341,825 326,455
Commercial real estate | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 6,507 11,943
2022 / 2021 1,631 5,389
2021 / 2020 14,350 12,386
2020 / 2019 14,527 1,420
2019 / 2018 3,393 6,917
Prior 3,839 5,471
Revolving Loans 0 0
Total 44,247 43,526
Commercial real estate | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 4,363 5,340
2022 / 2021 198 13,528
2021 / 2020 1,969 3,454
2020 / 2019 3,036 1,907
2019 / 2018 1,827 10,248
Prior 4,558 62
Revolving Loans 50 0
Total 16,001 34,539
Commercial real estate | Substandard Non-accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 225 0
2022 / 2021 1,174 3,959
2021 / 2020 3,074 33
2020 / 2019 28 0
2019 / 2018 0 1,647
Prior 565 5
Revolving Loans 0 0
Total 5,066 5,644
Real estate construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 118,996 230,042
2023, charge-off 0  
2022 / 2021 187,238 203,743
2022, charge-off 0  
2021 / 2020 134,786 71,184
2021, charge-off 0  
2020 / 2019 58,907 1,539
2020, charge-off 0  
2019 / 2018 1,451 1,901
2019, charge-off 0  
Prior 2,978 3,149
Prior, charge-off 0  
Revolving Loans 28,044 18,911
Revolving Loans, charge-off 0  
Total 532,400 530,469
Total, gross write-offs 0  
Real estate construction | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 112,757 219,112
2022 / 2021 183,359 191,724
2021 / 2020 131,457 68,015
2020 / 2019 55,596 1,490
2019 / 2018 1,407 1,901
Prior 2,978 1,751
Revolving Loans 28,044 18,911
Total 515,598 502,904
Real estate construction | Watch    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 860 8,530
2022 / 2021 3,879 12,019
2021 / 2020 3,329 3,169
2020 / 2019 3,311 48
2019 / 2018 44 0
Prior 0 1,398
Revolving Loans 0 0
Total 11,423 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 5,379 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 5,379 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 143,778 400,507
2023, charge-off 0  
2022 / 2021 394,855 460,072
2022, charge-off 5  
2021 / 2020 432,629 177,299
2021, charge-off 0  
2020 / 2019 167,367 79,126
2020, charge-off 29  
2019 / 2018 74,686 58,481
2019, charge-off 0  
Prior 294,259 270,808
Prior, charge-off 74  
Revolving Loans 195,483 210,789
Revolving Loans, charge-off 0  
Total 1,703,057 1,657,082
Total, gross write-offs 108  
Retail real estate | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 143,072 396,547
2022 / 2021 391,593 456,158
2021 / 2020 429,040 175,148
2020 / 2019 166,221 77,569
2019 / 2018 73,904 56,887
Prior 289,770 267,387
Revolving Loans 192,991 209,903
Total 1,686,591 1,639,599
Retail real estate | Watch    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 529 2,928
2022 / 2021 2,764 2,991
2021 / 2020 2,915 1,846
2020 / 2019 990 1,444
2019 / 2018 597 1,063
Prior 865 27
Revolving Loans 1,502 221
Total 10,162 10,520
Retail real estate | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 54 945
2022 / 2021 56 0
2021 / 2020 0 0
2020 / 2019 0 0
2019 / 2018 0 0
Prior 387 393
Revolving Loans 0 0
Total 497 1,338
Retail real estate | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 123 77
2022 / 2021 74 732
2021 / 2020 297 198
2020 / 2019 58 81
2019 / 2018 82 141
Prior 1,022 1,293
Revolving Loans 241 7
Total 1,897 2,529
Retail real estate | Substandard Non-accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 0 10
2022 / 2021 368 191
2021 / 2020 377 107
2020 / 2019 98 32
2019 / 2018 103 390
Prior 2,215 1,708
Revolving Loans 749 658
Total 3,910 3,096
Retail other    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 62,466 134,581
2023, charge-off 2  
2022 / 2021 113,289 43,646
2022, charge-off 64  
2021 / 2020 28,921 13,144
2021, charge-off 137  
2020 / 2019 9,705 13,086
2020, charge-off 1  
2019 / 2018 8,403 5,646
2019, charge-off 0  
Prior 2,635 993
Prior, charge-off 168  
Revolving Loans 83,382 91,028
Revolving Loans, charge-off 0  
Total 308,801 302,124
Total, gross write-offs 372  
Retail other | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 / 2022 62,466 134,567
2022 / 2021 113,226 43,512
2021 / 2020 28,921 13,141
2020 / 2019 9,702 13,086
2019 / 2018 8,400 5,646
Prior 2,634 991
Revolving Loans 83,382 91,028
Total 308,731 301,971
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