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v3.26.1

LOANS AND LEASES - Additional Information (Details) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2026 USD ($) loans | Mar. 31, 2025 USD ($) loans | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, Troubled Debt Restructuring, Subsequent Default | $ 1,000,000.0 | $ 1,000,000.0 |  |
Real Estate Acquired Through Foreclosure | 238,000 | $ 213,000 | $ 184,000 | $ 64,000
Unused Commitments to Extend Credit | $ 4,660,934,000 |  | 4,467,728,000 |
Impaired receivables, Number of Contracts | loans | 6 | 10 |  |
Gross loans and leases, excluding accrued interest | $ 13,494,841,000 |  | 13,424,070,000 |
BankFinancial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans and leases, excluding accrued interest | 300,000,000 |  |  |
Commercial segment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans and leases, excluding accrued interest | 22,576,000 |  | 27,461,000 |
Residential real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Restructured Loans, Loan Relationships, Review Threshold Amount Minimum | 250,000 |  |  |
Gross loans and leases, excluding accrued interest | 17,439,000 |  | 18,302,000 |
Lease financing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans and leases, excluding accrued interest | 5,857,000 |  | $ 5,660,000 |
Financial Difficulty Modification |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Unused Commitments to Extend Credit | $ 0 | $ 0 |  |

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