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BUSINESS COMBINATIONS (Details) - USD ($) $ in Thousands |  |  |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2026 | Nov. 01, 2025 | Jun. 23, 2025 | Feb. 29, 2024 | Dec. 31, 2021 | Mar. 31, 2026 | Mar. 31, 2025 | Dec. 31, 2025
Business Combination [Line Items] |  |  |  |  |  |  |  |
Other Investments |  |  |  |  |  | $ 137,018 |  | $ 129,564
Total liabilities assumed |  |  |  |  |  |  | $ 0 |
Business Combination, Bargain Purchase, Gain Recognized, Amount |  |  |  |  |  | (8,892) | $ 0 |
Westfield Bank |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Cash consideration |  |  | $ 260,000 | $ 260,000 |  |  |  |
Business Combination, Consideration Transferred, Equity Interest |  |  | $ 64,400 |  | $ 64,450 |  |  |
Cash |  | $ 72,814 |  |  |  |  |  |
Business Combination, Recognized Asset Acquired, Available for sale Securities |  | 301,007 |  |  |  |  |  |
Other Investments |  | 25,491 |  |  |  |  |  |
Loans, net of ACL |  | 1,571,531 |  |  |  |  |  |
Premises and equipment |  | 6,026 |  |  |  |  |  |
Intangible Assets |  | 1,105 |  |  |  |  |  |
Business Combination, Recognized Asset Acquired, Other Asset, Current |  | 103,513 |  |  |  |  |  |
Total assets acquired |  | 2,128,552 |  |  |  |  |  |
Business Combinations, Deposits |  | 1,790,442 |  |  |  |  |  |
Long-term borrowings |  | 1,920 |  |  |  |  |  |
Business Combinations, FHLB advances |  | 80,000 |  |  |  |  |  |
Other liabilities |  | 23,627 |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed, Liabilities, Excluding Earn Out |  | 1,895,989 |  |  |  |  |  |
Total liabilities assumed |  |  |  |  |  | 156 |  |
Net identifiable assets |  | 232,563 |  |  |  |  |  |
Goodwill |  | 91,887 |  |  |  |  |  |
Westfield Bank | Core deposits |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived |  | 47,065 |  |  |  |  |  |
BankFinancial |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Cash consideration | $ 6 |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interest | 149,648 |  |  |  |  |  |  |
Total purchase consideration | 149,654 |  |  |  |  |  |  |
Cash | 12,724 |  |  |  |  |  |  |
Other Short-Term Investments | 493,646 |  |  |  |  |  |  |
Business Combination, Recognized Asset Acquired, Available for sale Securities | 138,332 |  |  |  |  |  |  |
Other Investments | 7,500 |  |  |  |  |  |  |
Loans, net of ACL | 264,121 |  |  |  |  |  |  |
Premises and equipment | 22,210 |  |  |  |  |  |  |
Intangible Assets | 295 |  |  |  |  |  |  |
Business Combination, Recognized Asset Acquired, Other Asset, Current | 28,559 |  |  |  |  |  |  |
Total assets acquired | 1,408,726 |  |  |  |  |  |  |
Business Combinations, Deposits | 1,209,437 |  |  |  |  |  |  |
Long-term borrowings | 17,936 |  |  |  |  |  |  |
Business Combinations, FHLB advances | 10,048 |  |  |  |  |  |  |
Other liabilities | 12,759 |  |  |  |  |  |  |
Total liabilities assumed | 1,250,180 |  |  |  |  | 1,250,180 |  |
Net identifiable assets | 158,546 |  |  |  |  |  |  |
Business Combination, Bargain Purchase, Gain Recognized, Amount | (8,892) |  |  |  |  | $ (8,892) |  |
Goodwill |  | $ 9,000 |  |  |  |  |  |
BankFinancial | Disposal Group, Held-for-Sale or Disposed of by Sale, Not Discontinued Operations |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Loans, net of ACL | 408,347 |  |  |  |  |  |  |
BankFinancial | Core deposits |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived | $ 32,992 |  |  |  |  |  |  |
Summit Funding Group |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |
Total purchase consideration |  |  |  |  | $ 324,450 |  |  |

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