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LOANS RECEIVABLE AND THE ALLOWANCE FOR CREDIT LOSSES (Loans by Type) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 10,869,096 | $ 10,810,455 |  |
Allowance for credit losses - loans | (151,140) | (149,643) | $ (141,457) | $ (141,465)
Net loans receivable | $ 10,717,956 | $ 10,660,812 |  |
Percent of total loans | 100.00% | 100.00% |  |
Unearned loan fees in excess of unamortized costs | $ 13,900 | $ 12,100 |  |
Discount on acquired loans, net | 4,300 | 4,600 |  |
Financing Receivable, Accrued Interest, before Allowance for Credit Loss | 51,500 | 47,800 |  |
Financing Receivable, Loans Held as Collateral, FHLB and Other Borrowings | 7,700,000 | 7,600,000 |  |
Commerical real estate - owner-occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 905,063 | $ 915,897 |  |
Percent of total loans | 8.30% | 8.50% |  |
Commercial real estate - investment properties |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 1,544,885 | $ 1,541,344 |  |
Percent of total loans | 14.20% | 14.30% |  |
Small Balance Commercial Real Estate Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 1,159,355 | $ 1,178,500 |  |
Percent of total loans | 10.70% | 10.90% |  |
Multifamily Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 809,101 | $ 811,232 |  |
Allowance for credit losses - loans | $ (9,293) | $ (9,326) | (8,475) | (7,734)
Percent of total loans | 7.40% | 7.50% |  |
Commercial construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 158,011 | $ 170,011 |  |
Percent of total loans | 1.40% | 1.60% |  |
Multifamily construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 573,014 | $ 503,993 |  |
Percent of total loans | 5.30% | 4.70% |  |
One- to four- family construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 495,931 | $ 526,432 |  |
Percent of total loans | 4.60% | 4.90% |  |
Land and land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 344,563 | $ 336,639 |  |
Percent of total loans | 3.20% | 3.10% |  |
Commercial Business |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 1,262,716 | $ 1,255,734 |  |
Percent of total loans | 11.60% | 11.60% |  |
Small business scored |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 1,028,067 | $ 1,022,154 |  |
Percent of total loans | 9.50% | 9.50% |  |
Agricultural business, including secured by farmland |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 317,958 | $ 331,089 |  |
Allowance for credit losses - loans | $ (3,890) | $ (3,865) | (3,094) | (3,475)
Percent of total loans | 2.90% | 3.00% |  |
One- to four-family residential [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 1,566,834 | $ 1,518,046 |  |
Allowance for credit losses - loans | $ (20,432) | $ (19,271) | (15,736) | (14,729)
Percent of total loans | 14.40% | 14.00% |  |
Consumer—home equity revolving lines of credit |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 597,060 | $ 588,703 |  |
Percent of total loans | 5.50% | 5.40% |  |
Consumer Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 106,538 | $ 110,681 |  |
Allowance for credit losses - loans | $ (9,518) | $ (9,238) | $ (9,009) | $ (8,971)
Percent of total loans | 1.00% | 1.00% |  |

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