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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 |

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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 + Details
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