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PORTFOLIO LOANS - Risk grades of portfolio loans, further sorted by origination year (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 $ 324,894 $ 1,520,323
2024 / 2023, charge-off 0 289
2023 / 2022 1,348,600 1,785,798
2023 /2022, charge-off 5,133 76
2022 / 2021 1,727,027 1,552,072
2022 / 2021, charge-off 0 592
2021 / 2020 1,472,816 705,335
2021 / 2020, charge-off 23 34
2020 / 2019 679,982 468,659
2020 / 2019, charge-off 0 391
Prior 1,034,094 660,624
Prior, charge-off 304 3,036
Revolving Loans 1,000,664 958,223
Revolving Loans, charge-off 0 0
Total 7,588,077 7,651,034
Total, gross write-offs 5,460 4,418
Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 6,663,672 6,736,067
Watch    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 722,802 747,122
Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 96,308 96,057
Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 87,830 64,347
Substandard Non-accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total 17,465 7,441
C&I and other commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 106,803 394,854
2024 / 2023, charge-off 0 284
2023 / 2022 326,698 295,539
2023 /2022, charge-off 5,130 0
2022 / 2021 273,965 184,527
2022 / 2021, charge-off 0 420
2021 / 2020 174,810 96,530
2021 / 2020, charge-off 0 0
2020 / 2019 90,655 47,510
2020 / 2019, charge-off 0 316
Prior 188,858 169,911
Prior, charge-off 88 1,409
Revolving Loans 666,922 647,123
Revolving Loans, charge-off 0 0
Total 1,828,711 1,835,994
Total, gross write-offs 5,218 2,429
C&I and other commercial | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 92,898 306,578
2023 / 2022 261,771 220,847
2022 / 2021 214,944 159,130
2021 / 2020 156,831 71,025
2020 / 2019 66,161 35,927
Prior 154,099 143,078
Revolving Loans 544,462 526,170
Total 1,491,166 1,462,755
C&I and other commercial | Watch    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 4,869 78,603
2023 / 2022 58,913 65,703
2022 / 2021 49,671 21,421
2021 / 2020 14,389 23,919
2020 / 2019 23,226 7,035
Prior 27,759 21,293
Revolving Loans 64,808 78,442
Total 243,635 296,416
C&I and other commercial | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 665 792
2023 / 2022 239 8,224
2022 / 2021 7,964 2,917
2021 / 2020 2,654 1,076
2020 / 2019 677 686
Prior 3,264 3,274
Revolving Loans 22,248 29,519
Total 37,711 46,488
C&I and other commercial | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 8,371 8,715
2023 / 2022 5,700 765
2022 / 2021 1,386 942
2021 / 2020 819 426
2020 / 2019 525 3,734
Prior 2,348 1,859
Revolving Loans 23,704 11,292
Total 42,853 27,733
C&I and other commercial | Substandard Non-accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 0 166
2023 / 2022 75 0
2022 / 2021 0 117
2021 / 2020 117 84
2020 / 2019 66 128
Prior 1,388 407
Revolving Loans 11,700 1,700
Total 13,346 2,602
Commercial real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 137,962 578,595
2024 / 2023, charge-off 0 0
2023 / 2022 507,916 882,350
2023 /2022, charge-off 0 0
2022 / 2021 897,297 844,293
2022 / 2021, charge-off 0 0
2021 / 2020 820,234 441,134
2021 / 2020, charge-off 0 0
2020 / 2019 425,881 344,373
2020 / 2019, charge-off 0 0
Prior 521,338 226,537
Prior, charge-off 96 953
Revolving Loans 21,042 20,055
Revolving Loans, charge-off 0 0
Total 3,331,670 3,337,337
Total, gross write-offs 96 953
Commercial real estate | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 77,146 395,644
2023 / 2022 362,541 824,506
2022 / 2021 845,621 720,052
2021 / 2020 676,837 399,195
2020 / 2019 384,545 271,078
Prior 433,216 199,662
Revolving Loans 17,468 16,893
Total 2,797,374 2,827,030
Commercial real estate | Watch    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 58,049 166,795
2023 / 2022 131,059 47,070
2022 / 2021 35,873 92,848
2021 / 2020 111,998 34,010
2020 / 2019 32,964 68,196
Prior 73,846 19,396
Revolving Loans 3,524 3,112
Total 447,313 431,427
Commercial real estate | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 1,405 14,313
2023 / 2022 8,646 10,507
2022 / 2021 13,126 12,446
2021 / 2020 12,578 4,968
2020 / 2019 5,015 3,297
Prior 9,162 3,014
Revolving Loans 0 0
Total 49,932 48,545
Commercial real estate | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 1,362 1,796
2023 / 2022 5,626 188
2022 / 2021 2,677 18,862
2021 / 2020 18,821 2,938
2020 / 2019 3,337 1,802
Prior 5,114 3,856
Revolving Loans 50 50
Total 36,987 29,492
Commercial real estate | Substandard Non-accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 0 47
2023 / 2022 44 79
2022 / 2021 0 85
2021 / 2020 0 23
2020 / 2019 20 0
Prior 0 609
Revolving Loans 0 0
Total 64 843
Real estate construction    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 58,333 213,138
2024 / 2023, charge-off 0 0
2023 / 2022 194,159 132,868
2023 /2022, charge-off 0 0
2022 / 2021 90,355 85,593
2022 / 2021, charge-off 0 0
2021 / 2020 75,737 2,938
2021 / 2020, charge-off 0 0
2020 / 2019 2,778 1,364
2020 / 2019, charge-off 0 0
Prior 3,576 3,178
Prior, charge-off 0 0
Revolving Loans 20,922 22,638
Revolving Loans, charge-off 0 0
Total 445,860 461,717
Total, gross write-offs 0 0
Real estate construction | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 58,333 204,952
2023 / 2022 177,437 128,462
2022 / 2021 72,325 85,086
2021 / 2020 75,282 2,616
2020 / 2019 2,458 1,323
Prior 3,332 2,934
Revolving Loans 20,922 22,638
Total 410,089 448,011
Real estate construction | Watch    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 0 2,859
2023 / 2022 3,678 4,406
2022 / 2021 18,030 507
2021 / 2020 455 322
2020 / 2019 320 41
Prior 0 0
Revolving Loans 0 0
Total 22,483 8,135
Real estate construction | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 0  
2023 / 2022 7,743  
2022 / 2021 0  
2021 / 2020 0  
2020 / 2019 0  
Prior 0  
Revolving Loans 0  
Total 7,743 0
Real estate construction | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 0 5,327
2023 / 2022 5,301 0
2022 / 2021 0 0
2021 / 2020 0 0
2020 / 2019 0 0
Prior 0 0
Revolving Loans 0 0
Total 5,301 5,327
Real estate construction | Substandard Non-accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 0 0
2023 / 2022 0 0
2022 / 2021 0 0
2021 / 2020 0 0
2020 / 2019 0 0
Prior 244 244
Revolving Loans 0 0
Total 244 244
Retail real estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 20,338 244,851
2024 / 2023, charge-off 0 0
2023 / 2022 241,821 382,017
2023 /2022, charge-off 0 5
2022 / 2021 381,426 414,578
2022 / 2021, charge-off 0 0
2021 / 2020 381,781 158,032
2021 / 2020, charge-off 0 29
2020 / 2019 155,230 70,815
2020 / 2019, charge-off 0 72
Prior 316,775 260,142
Prior, charge-off 52 301
Revolving Loans 211,292 190,020
Revolving Loans, charge-off 0 0
Total 1,708,663 1,720,455
Total, gross write-offs 52 407
Retail real estate | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 19,533 243,400
2023 / 2022 240,662 376,922
2022 / 2021 376,623 411,723
2021 / 2020 378,955 156,762
2020 / 2019 153,995 70,099
Prior 313,080 256,571
Revolving Loans 209,165 187,420
Total 1,692,013 1,702,897
Retail real estate | Watch    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 805 1,096
2023 / 2022 832 4,137
2022 / 2021 2,873 2,442
2021 / 2020 2,242 954
2020 / 2019 937 536
Prior 401 234
Revolving Loans 1,281 1,745
Total 9,371 11,144
Retail real estate | Special Mention    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 0 286
2023 / 2022 191 358
2022 / 2021 354 0
2021 / 2020 0 0
2020 / 2019 0 0
Prior 377 380
Revolving Loans 0 0
Total 922 1,024
Retail real estate | Substandard    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 0 69
2023 / 2022 136 72
2022 / 2021 1,049 292
2021 / 2020 519 49
2020 / 2019 45 80
Prior 935 997
Revolving Loans 5 236
Total 2,689 1,795
Retail real estate | Substandard Non-accrual    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 0 0
2023 / 2022 0 528
2022 / 2021 527 121
2021 / 2020 65 267
2020 / 2019 253 100
Prior 1,982 1,960
Revolving Loans 841 619
Total 3,668 3,595
Retail other    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 1,458 88,885
2024 / 2023, charge-off 0 5
2023 / 2022 78,006 93,024
2023 /2022, charge-off 3 71
2022 / 2021 83,984 23,081
2022 / 2021, charge-off 0 172
2021 / 2020 20,254 6,701
2021 / 2020, charge-off 23 5
2020 / 2019 5,438 4,597
2020 / 2019, charge-off 0 3
Prior 3,547 856
Prior, charge-off 68 373
Revolving Loans 80,486 78,387
Revolving Loans, charge-off 0 0
Total 273,173 295,531
Total, gross write-offs 94 629
Retail other | Pass    
Financing Receivable, Credit Quality Indicator [Line Items]    
2024 / 2023 1,458 88,885
2023 / 2022 78,006 92,931
2022 / 2021 83,891 23,019
2021 / 2020 20,205 6,701
2020 / 2019 5,438 4,597
Prior 3,546 854
Revolving Loans 80,486 78,387
Total 273,030 295,374
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]    
2024 / 2023 0 0
2023 / 2022 0 93
2022 / 2021 93 62
2021 / 2020 49 0
2020 / 2019 0 0
Prior 1 2
Revolving Loans 0 0
Total $ 143 $ 157