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LOANS AND CREDIT QUALITY - Amortized Cost in Loans Based Upon Year of Origination and Payment Status (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Dec. 31, 2025
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |
Total loan receivables before allowance for credit losses | $ 13,852,209 |  | $ 14,176,936
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
Loans and leases charged off during the period | 7,205 | $ 12,217 |
Residential Real Estate |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |
Financing receivable, year one | 130,475 |  | 552,620
Financing receivable, year two | 521,652 |  | 155,815
Financing receivable, year three | 145,956 |  | 110,989
Financing receivable, year four | 103,754 |  | 767,915
Financing receivable, year five | 761,541 |  | 828,395
Financing receivable, more than five years | 1,808,970 |  | 1,049,029
Revolving Loans Amortized Cost Basis | 513,757 |  | 502,369
Revolving Loans Converted to Term | 31,015 |  | 3,671
Total loan receivables before allowance for credit losses | 4,017,120 |  | 3,970,803
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
Financing receivable, year one, Gross charge-offs | 0 |  | 0
Financing receivable, year two, Gross charge-offs | 0 |  | 0
Financing receivable, year three, Gross charge-offs | 0 |  | 0
Financing receivable, year four, Gross charge-offs | 0 |  | 0
Financing receivable, year five, Gross charge-offs | 0 |  | 0
Financing receivable, more than five years, Gross charge-offs | 1 |  | 9
Revolving Loans Amortized Cost Basis | 0 |  | 96
Revolving Loans Converted to Term | 0 |  | 0
Loans and leases charged off during the period | 1 | 0 | 105
Residential Real Estate | Performing |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |
Financing receivable, year one | 130,475 |  | 552,620
Financing receivable, year two | 521,652 |  | 155,815
Financing receivable, year three | 145,956 |  | 110,989
Financing receivable, year four | 103,345 |  | 767,915
Financing receivable, year five | 760,796 |  | 828,395
Financing receivable, more than five years | 1,801,763 |  | 1,041,378
Revolving Loans Amortized Cost Basis | 510,414 |  | 499,312
Revolving Loans Converted to Term | 30,443 |  | 3,671
Total loan receivables before allowance for credit losses | 4,004,844 |  | 3,960,095
Residential Real Estate | Nonperforming |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |
Financing receivable, year one | 0 |  | 0
Financing receivable, year two | 0 |  | 0
Financing receivable, year three | 0 |  | 0
Financing receivable, year four | 409 |  | 0
Financing receivable, year five | 745 |  | 0
Financing receivable, more than five years | 7,207 |  | 7,651
Revolving Loans Amortized Cost Basis | 3,343 |  | 3,057
Revolving Loans Converted to Term | 572 |  | 0
Total loan receivables before allowance for credit losses | 12,276 |  | 10,708
Auto |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |
Financing receivable, year one | 0 |  | 157
Financing receivable, year two | 149 |  | 218
Financing receivable, year three | 203 |  | 49,420
Financing receivable, year four | 42,460 |  | 470,011
Financing receivable, year five | 394,711 |  | 228,449
Financing receivable, more than five years | 202,302 |  | 41,912
Revolving Loans Amortized Cost Basis | 0 |  | 0
Revolving Loans Converted to Term | 0 |  | 845
Total loan receivables before allowance for credit losses | 639,825 |  | 791,012
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
Financing receivable, year one, Gross charge-offs | 0 |  | 0
Financing receivable, year two, Gross charge-offs | 0 |  | 0
Financing receivable, year three, Gross charge-offs | 0 |  | 1,690
Financing receivable, year four, Gross charge-offs | 283 |  | 23,927
Financing receivable, year five, Gross charge-offs | 3,728 |  | 12,077
Financing receivable, more than five years, Gross charge-offs | 2,409 |  | 2,985
Revolving Loans Amortized Cost Basis | 0 |  | 0
Revolving Loans Converted to Term | 0 |  | 0
Loans and leases charged off during the period | 6,420 | 11,506 | 40,679
Auto | Performing |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |
Financing receivable, year one | 0 |  | 157
Financing receivable, year two | 149 |  | 218
Financing receivable, year three | 203 |  | 49,109
Financing receivable, year four | 42,327 |  | 467,560
Financing receivable, year five | 392,402 |  | 227,342
Financing receivable, more than five years | 201,215 |  | 41,638
Revolving Loans Amortized Cost Basis | 0 |  | 0
Revolving Loans Converted to Term | 0 |  | 845
Total loan receivables before allowance for credit losses | 636,296 |  | 786,869
Auto | Nonperforming |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |
Financing receivable, year one | 0 |  | 0
Financing receivable, year two | 0 |  | 0
Financing receivable, year three | 0 |  | 311
Financing receivable, year four | 133 |  | 2,451
Financing receivable, year five | 2,309 |  | 1,107
Financing receivable, more than five years | 1,087 |  | 274
Revolving Loans Amortized Cost Basis | 0 |  | 0
Revolving Loans Converted to Term | 0 |  | 0
Total loan receivables before allowance for credit losses | 3,529 |  | 4,143
Other consumer |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |
Financing receivable, year one | 116,388 |  | 216,135
Financing receivable, year two | 209,287 |  | 171,061
Financing receivable, year three | 166,456 |  | 145,091
Financing receivable, year four | 141,679 |  | 73,178
Financing receivable, year five | 68,528 |  | 15,624
Financing receivable, more than five years | 39,331 |  | 27,294
Revolving Loans Amortized Cost Basis | 4,062 |  | 5,825
Revolving Loans Converted to Term | 0 |  | 143
Total loan receivables before allowance for credit losses | 745,731 |  | 654,351
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract] |  |  |
Financing receivable, year one, Gross charge-offs | 154 |  | 619
Financing receivable, year two, Gross charge-offs | 6 |  | 1
Financing receivable, year three, Gross charge-offs | 6 |  | 0
Financing receivable, year four, Gross charge-offs | 150 |  | 0
Financing receivable, year five, Gross charge-offs | 0 |  | 607
Financing receivable, more than five years, Gross charge-offs | 328 |  | 1,106
Revolving Loans Amortized Cost Basis | 9 |  | 78
Revolving Loans Converted to Term | 0 |  | 0
Loans and leases charged off during the period | 653 | $ 594 | 2,411
Other consumer | Performing |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |
Financing receivable, year one | 116,388 |  | 216,135
Financing receivable, year two | 209,287 |  | 171,060
Financing receivable, year three | 166,456 |  | 145,091
Financing receivable, year four | 141,679 |  | 73,178
Financing receivable, year five | 68,528 |  | 15,624
Financing receivable, more than five years | 39,331 |  | 27,294
Revolving Loans Amortized Cost Basis | 4,058 |  | 5,825
Revolving Loans Converted to Term | 0 |  | 143
Total loan receivables before allowance for credit losses | 745,727 |  | 654,350
Other consumer | Nonperforming |  |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |  |
Financing receivable, year one | 0 |  | 0
Financing receivable, year two | 0 |  | 1
Financing receivable, year three | 0 |  | 0
Financing receivable, year four | 0 |  | 0
Financing receivable, year five | 0 |  | 0
Financing receivable, more than five years | 0 |  | 0
Revolving Loans Amortized Cost Basis | 4 |  | 0
Revolving Loans Converted to Term | 0 |  | 0
Total loan receivables before allowance for credit losses | $ 4 |  | $ 1

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