v3.26.1
ALLOWANCE FOR CREDIT LOSSES - Changes in the Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Financing Receivable, Allowance for Credit Loss [Line Items]    
Balance at beginning of year $ 186,487 $ 156,791
Provision for Credit Losses-loans and leases 6,030 9,141
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff 12,660 11,513
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery 1,030 1,063
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff (Recovery) 11,630 10,450
Balance at end of year 183,716 155,482
BankFinancial    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Balance at beginning of year 2,829  
Commercial    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Balance at beginning of year 75,155 49,987
Provision for Credit Losses-loans and leases 4,271 8,470
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff 10,788 8,178
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery 100 195
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff (Recovery) 10,688 7,983
Balance at end of year 70,472 50,474
Commercial | BankFinancial    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Balance at beginning of year 1,734  
Lease financing    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Balance at beginning of year 15,162 13,079
Provision for Credit Losses-loans and leases 100 1,183
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff 43 1,454
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery 23 29
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff (Recovery) 20 1,425
Balance at end of year 15,242 12,837
Lease financing | BankFinancial    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Balance at beginning of year 0  
Construction real estate    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Balance at beginning of year 16,951 19,216
Provision for Credit Losses-loans and leases (2,650) 348
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff 0 0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery 0 0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff (Recovery) 0 0
Balance at end of year 14,301 19,564
Construction real estate | BankFinancial    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Balance at beginning of year 0  
Commercial real estate    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Balance at beginning of year 38,389 35,721
Provision for Credit Losses-loans and leases 4,928 (1,108)
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff 29 0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery 28 24
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff (Recovery) 1 (24)
Balance at end of year 44,223 34,637
Commercial real estate | BankFinancial    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Balance at beginning of year 907  
Residential Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Balance at beginning of year 18,084 17,822
Provision for Credit Losses-loans and leases (1,940) (660)
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff 127 0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery 30 24
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff (Recovery) 97 (24)
Balance at end of year 16,101 17,186
Residential Portfolio Segment [Member] | BankFinancial    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Balance at beginning of year 54  
Home equity    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Balance at beginning of year 16,035 14,774
Provision for Credit Losses-loans and leases 587 300
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff 119 86
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery 116 144
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff (Recovery) 3 (58)
Balance at end of year 16,661 15,132
Home equity | BankFinancial    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Balance at beginning of year 42  
Installment    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Balance at beginning of year 3,874 3,564
Provision for Credit Losses-loans and leases 80 313
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff 1,058 1,321
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery 598 563
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff (Recovery) 460 758
Balance at end of year 3,495 3,119
Installment | BankFinancial    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Balance at beginning of year 1  
Credit card    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Balance at beginning of year 2,837 2,628
Provision for Credit Losses-loans and leases 654 295
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff 496 474
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Recovery 135 84
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff (Recovery) (361) (390)
Balance at end of year 3,221 $ 2,533
Credit card | BankFinancial    
Financing Receivable, Allowance for Credit Loss [Line Items]    
Balance at beginning of year $ 91