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BUSINESS COMBINATION - Additional Information (Details) - USD ($) $ in Thousands |  |  |  |  |  | 3 Months Ended | 12 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 | Dec. 31, 2024
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  | $ 22,779,815 |  | $ 21,129,379 |
Net loans and leases |  |  |  |  |  | 13,311,125 |  | 13,237,583 |
Deposits |  |  |  |  |  | 17,918,722 |  | 16,421,842 |
Business Combination, Recognized Liability Assumed, Liability |  |  |  |  |  |  | $ 0 |  |
Business Combination, Bargain Purchase, Gain Recognized, Amount |  |  |  |  |  | 8,892 | 0 |  |
Less: Allowance for credit losses |  |  |  |  |  | 183,716 | $ 155,482 | 186,487 | $ 156,791
BankFinancial |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  | 1,400,000 |  |  |
Deposits |  |  |  |  |  |  |  | $ 1,300,000 |
Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares | 5,980,878 |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interest | $ 149,648 |  |  |  |  |  |  |  |
Cash consideration | 6 |  |  |  |  |  |  |  |
Business Combination, Recognized Asset Acquired, Asset | 1,408,726 |  |  |  |  |  |  |  |
Business Combination, Recognized Liability Assumed, Liability | 1,250,180 |  |  |  |  | 1,250,180 |  |  |
Goodwill |  | $ 9,000 |  |  |  |  |  |  |
Business combination, Consideration Transferred, Equity interest Issued Ratio |  |  |  |  |  |  |  | 0.48 |
Business Combination, Bargain Purchase, Gain Recognized, Amount | 8,892 |  |  |  |  | 8,892 |  |  |
Financing Receivable, Purchased with Credit Deterioration, Amount at Par Value | 4,000 |  |  |  |  |  |  |  |
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date | 800 |  |  |  |  |  |  |  |
Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price | 3,000 |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred | 149,654 |  |  |  |  |  |  |  |
Less: Allowance for credit losses | $ 2,800 |  |  |  |  |  |  | $ 2,829 |
Westfield Bank |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  | 2,100,000 |  |  |
Deposits |  |  |  |  |  | 1,900,000 |  |  |
Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares |  |  | 2,753,094 |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interest |  |  | $ 64,400 |  | $ 64,450 |  |  |  |
Cash consideration |  |  | 260,000 | $ 260,000 |  |  |  |  |
Payments for Merger Related Costs |  |  |  |  |  | 5,300 |  | $ 5,800 |
Business Combination, Recognized Asset Acquired, Asset |  | 2,128,552 |  |  |  |  |  |  |
Business Combination, Recognized Liability Assumed, Liability |  |  |  |  |  | $ 156 |  |  |
Goodwill |  | 91,887 |  |  |  |  |  |  |
Business Combination, Price of Acquisition, Expected |  |  | $ 324,400 |  |  |  |  |  |
Financing Receivable, Purchased with Credit Deterioration, Amount at Par Value |  | 32,000 |  |  |  |  |  |  |
Financing Receivable, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date |  | 3,000 |  |  |  |  |  |  |
Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price |  | 27,400 |  |  |  |  |  |  |
Less: Allowance for credit losses |  | $ 23,700 |  |  |  |  |  |  |

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