v3.26.1
LOANS AND CREDIT QUALITY - Amortized Cost in Loans Based Upon Year of Origination and Payment Status (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 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 $ 13,576,196   $ 13,576,196   $ 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 6,308 $ 9,949 13,513 $ 22,166  
Residential real estate          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Financing receivable, year one 311,543   311,543   552,620
Financing receivable, year two 457,561   457,561   155,815
Financing receivable, year three 172,152   172,152   110,989
Financing receivable, year four 87,124   87,124   767,915
Financing receivable, year five 595,049   595,049   828,395
Financing receivable, more than five years 1,903,607   1,903,607   1,049,029
Revolving Loans Amortized Cost Basis 547,478   547,478   502,369
Revolving Loans Converted to Term 33,353   33,353   3,671
Total loan receivables before allowance for credit losses 4,107,867   4,107,867   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 0 0 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 311,543   311,543   552,620
Financing receivable, year two 457,561   457,561   155,815
Financing receivable, year three 172,152   172,152   110,989
Financing receivable, year four 86,707   86,707   767,915
Financing receivable, year five 594,309   594,309   828,395
Financing receivable, more than five years 1,892,339   1,892,339   1,041,378
Revolving Loans Amortized Cost Basis 542,296   542,296   499,312
Revolving Loans Converted to Term 32,256   32,256   3,671
Total loan receivables before allowance for credit losses 4,089,163   4,089,163   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   0
Financing receivable, year two 0   0   0
Financing receivable, year three 0   0   0
Financing receivable, year four 417   417   0
Financing receivable, year five 740   740   0
Financing receivable, more than five years 11,268   11,268   7,651
Revolving Loans Amortized Cost Basis 5,182   5,182   3,057
Revolving Loans Converted to Term 1,097   1,097   0
Total loan receivables before allowance for credit losses 18,704   18,704   10,708
Auto          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Financing receivable, year one 0   0   157
Financing receivable, year two 128   128   218
Financing receivable, year three 169   169   49,420
Financing receivable, year four 36,130   36,130   470,011
Financing receivable, year five 327,163   327,163   228,449
Financing receivable, more than five years 146,642   146,642   41,912
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   845
Total loan receivables before allowance for credit losses 510,232   510,232   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     609   23,927
Financing receivable, year five, gross charge-offs     7,579   12,077
Financing receivable, more than five years, gross charge-offs     3,805   2,985
Revolving Loans Amortized Cost Basis     0   0
Revolving Loans Converted to Term     0   0
Loans and leases charged off during the period 5,573 9,253 11,993 20,759 40,679
Auto | Performing          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Financing receivable, year one 0   0   157
Financing receivable, year two 128   128   218
Financing receivable, year three 169   169   49,109
Financing receivable, year four 35,879   35,879   467,560
Financing receivable, year five 325,127   325,127   227,342
Financing receivable, more than five years 145,717   145,717   41,638
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   845
Total loan receivables before allowance for credit losses 507,020   507,020   786,869
Auto | Nonperforming          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Financing receivable, year one 0   0   0
Financing receivable, year two 0   0   0
Financing receivable, year three 0   0   311
Financing receivable, year four 251   251   2,451
Financing receivable, year five 2,036   2,036   1,107
Financing receivable, more than five years 925   925   274
Revolving Loans Amortized Cost Basis 0   0   0
Revolving Loans Converted to Term 0   0   0
Total loan receivables before allowance for credit losses 3,212   3,212   4,143
Other consumer          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Financing receivable, year one 199,909   199,909   216,135
Financing receivable, year two 211,782   211,782   171,061
Financing receivable, year three 152,868   152,868   145,091
Financing receivable, year four 140,522   140,522   73,178
Financing receivable, year five 62,114   62,114   15,624
Financing receivable, more than five years 35,828   35,828   27,294
Revolving Loans Amortized Cost Basis 3,879   3,879   5,825
Revolving Loans Converted to Term 0   0   143
Total loan receivables before allowance for credit losses 806,902   806,902   654,351
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Financing receivable, year one, gross charge-offs     385   619
Financing receivable, year two, gross charge-offs     28   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     635   1,106
Revolving Loans Amortized Cost Basis     0   78
Revolving Loans Converted to Term     11   0
Loans and leases charged off during the period 562 $ 591 1,215 $ 1,185 2,411
Other consumer | Performing          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]          
Financing receivable, year one 199,909   199,909   216,135
Financing receivable, year two 211,779   211,779   171,060
Financing receivable, year three 152,868   152,868   145,091
Financing receivable, year four 140,522   140,522   73,178
Financing receivable, year five 62,114   62,114   15,624
Financing receivable, more than five years 35,828   35,828   27,294
Revolving Loans Amortized Cost Basis 3,864   3,864   5,825
Revolving Loans Converted to Term 0   0   143
Total loan receivables before allowance for credit losses 806,884   806,884   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   0
Financing receivable, year two 3   3   1
Financing receivable, year three 0   0   0
Financing receivable, year four 0   0   0
Financing receivable, year five 0   0   0
Financing receivable, more than five years 0   0   0
Revolving Loans Amortized Cost Basis 15   15   0
Revolving Loans Converted to Term 0   0   0
Total loan receivables before allowance for credit losses $ 18   $ 18   $ 1