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LOANS RECEIVABLE AND THE ALLOWANCE FOR CREDIT LOSSES (Loans by Type) (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 11,224,606 |  | $ 10,810,455 |  |  |
Allowance for credit losses - loans | (154,585) | $ (152,848) | (149,643) | $ (146,960) | $ (144,680) | $ (141,465)
Net loans receivable | $ 11,070,021 |  | $ 10,660,812 |  |  |
Percent of total loans | 100.00% |  | 100.00% |  |  |
Unearned loan fees in excess of unamortized costs | $ 15,000 |  | $ 12,100 |  |  |
Discount on acquired loans, net | 3,800 |  | 4,600 |  |  |
Financing Receivable, Accrued Interest, before Allowance for Credit Loss | 53,100 |  | 47,800 |  |  |
Financing Receivable, Loans Held as Collateral, FHLB and Other Borrowings | 8,000,000 |  | 7,600,000 |  |  |
Commerical real estate - owner-occupied [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 990,516 |  | $ 915,897 |  |  |
Percent of total loans | 9.00% |  | 8.00% |  |  |
Commercial real estate - investment properties |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 1,583,863 |  | $ 1,541,344 |  |  |
Percent of total loans | 14.00% |  | 14.00% |  |  |
Small balance CRE |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 1,218,822 |  | $ 1,178,500 |  |  |
Percent of total loans | 11.00% |  | 11.00% |  |  |
Multifamily Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 889,866 |  | $ 811,232 |  |  |
Allowance for credit losses - loans | $ (10,233) | (8,253) | $ (9,326) | (8,804) | (8,039) | (7,734)
Percent of total loans | 8.00% |  | 8.00% |  |  |
Commercial construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 124,051 |  | $ 170,011 |  |  |
Percent of total loans | 1.00% |  | 2.00% |  |  |
Multifamily construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 524,108 |  | $ 503,993 |  |  |
Percent of total loans | 5.00% |  | 5.00% |  |  |
One- to four- family construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 507,350 |  | $ 526,432 |  |  |
Percent of total loans | 5.00% |  | 5.00% |  |  |
Land and land development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 370,690 |  | $ 336,639 |  |  |
Percent of total loans | 3.00% |  | 3.00% |  |  |
Commercial Business |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 1,281,615 |  | $ 1,255,734 |  |  |
Percent of total loans | 11.00% |  | 12.00% |  |  |
Small business scored |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 1,087,714 |  | $ 1,022,154 |  |  |
Percent of total loans | 10.00% |  | 9.00% |  |  |
Agricultural business, including secured by farmland |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 346,686 |  | $ 331,089 |  |  |
Allowance for credit losses - loans | $ (5,340) | (4,045) | $ (3,865) | (3,718) | (3,573) | (3,475)
Percent of total loans | 3.00% |  | 3.00% |  |  |
One- to four-family residential [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 1,575,164 |  | $ 1,518,046 |  |  |
Allowance for credit losses - loans | $ (20,463) | (20,906) | $ (19,271) | (17,925) | (16,737) | (14,729)
Percent of total loans | 14.00% |  | 14.00% |  |  |
Consumer—home equity revolving lines of credit |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 622,615 |  | $ 588,703 |  |  |
Percent of total loans | 5.00% |  | 5.00% |  |  |
Consumer Loan [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 101,546 |  | $ 110,681 |  |  |
Allowance for credit losses - loans | $ (10,408) | $ (10,148) | $ (9,238) | $ (9,043) | $ (8,971) | $ (8,971)
Percent of total loans | 1.00% |  | 1.00% |  |  |

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