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LOANS AND ALLOWANCE FOR CREDIT LOSSES (Schedule of Loan Receivables) (Details) - USD ($) | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
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Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total loans | $ 5,855,532,000 |  | $ 5,642,012,000 |  |  |
Deferred fees, net of origination costs | (16,640,000) |  | (17,215,000) |  |  |
Loans, net of deferred fees and costs | 5,838,892,000 |  | 5,624,797,000 |  |  |
Allowance for credit losses | (60,008,000) | $ (58,538,000) | (57,965,000) | $ (51,650,000) | $ (47,752,000) | $ (44,876,000)
Net loans | 5,778,884,000 |  | 5,566,832,000 |  |  |
Loan encumbered | 170,800,000 |  | 60,000,000.0 |  |  |
Asset Pledged as Collateral |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Loan pledged | 3,700,000,000 |  | 3,300,000,000 |  |  |
Real Estate |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total loans | 4,735,164,000 |  | 4,573,463,000 |  |  |
Commercial & industrial |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total loans | 1,105,294,000 |  | 1,051,463,000 |  |  |
Allowance for credit losses | (11,282,000) | (10,937,000) | (11,207,000) | (10,977,000) | (10,757,000) | (10,274,000)
Loan encumbered | 264,300,000 |  | 548,600,000 |  |  |
Commercial & industrial | Paycheck Protection Program loans |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Net loans | 38,000 |  | 54,000 |  |  |
Consumer |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total loans | 15,074,000 |  | 17,086,000 |  |  |
Allowance for credit losses | (525,000) | (493,000) | (480,000) | (547,000) | (620,000) | (195,000)
Commercial |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total loans | 4,056,013,000 |  | 3,857,711,000 |  |  |
Commercial | Real Estate |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total loans | 4,056,013,000 |  | 3,857,711,000 |  |  |
Allowance for credit losses | (38,484,000) | (36,704,000) | (35,635,000) | (34,621,000) | (31,836,000) | (29,496,000)
Construction |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total loans | 146,596,000 |  | 153,512,000 |  |  |
Construction | Real Estate |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total loans | 146,596,000 |  | 153,512,000 |  |  |
Allowance for credit losses | (1,759,000) | (1,712,000) | (1,765,000) | (1,600,000) | (1,261,000) | (1,983,000)
Multi-family |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total loans | 440,124,000 |  | 467,536,000 |  |  |
Multi-family | Real Estate |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total loans | 440,124,000 |  | 467,536,000 |  |  |
Allowance for credit losses | (7,827,000) | (8,171,000) | (8,215,000) | (3,543,000) | (2,871,000) | (2,823,000)
One-to-four-family |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total loans | 92,431,000 |  | 94,704,000 |  |  |
One-to-four-family | Real Estate |  |  |  |  |  |
Loans and Leases Receivable Disclosure [Line Items] |  |  |  |  |  |
Total loans | 92,431,000 |  | 94,704,000 |  |  |
Allowance for credit losses | $ (131,000) | $ (521,000) | $ (663,000) | $ (362,000) | $ (407,000) | $ (105,000)

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