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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