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LOANS RECEIVABLE AND THE ALLOWANCE FOR CREDIT LOSSES (Loans by Type) (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 11,143,848 |  | $ 10,810,455 |  |  |
Allowance for credit losses - loans | (152,848) | $ (151,140) | (149,643) | $ (144,680) | $ (141,457) | $ (141,465)
Net loans receivable | $ 10,991,000 |  | $ 10,660,812 |  |  |
Percent of total loans | 100.00% |  | 100.00% |  |  |
Unearned loan fees in excess of unamortized costs | $ 14,900 |  | $ 12,100 |  |  |
Discount on acquired loans, net | 4,100 |  | 4,600 |  |  |
Financing Receivable, Accrued Interest, before Allowance for Credit Loss | 53,300 |  | 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 | $ 950,922 |  | $ 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 | $ 1,536,142 |  | $ 1,541,344 |  |  |
Percent of total loans | 14.00% |  | 14.00% |  |  |
Small balance CRE |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 1,234,302 |  | $ 1,178,500 |  |  |
Percent of total loans | 11.00% |  | 11.00% |  |  |
Multifamily Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 717,089 |  | $ 811,232 |  |  |
Allowance for credit losses - loans | $ (8,253) | (9,293) | $ (9,326) | (8,039) | (8,475) | (7,734)
Percent of total loans | 6.00% |  | 8.00% |  |  |
Commercial construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 173,296 |  | $ 170,011 |  |  |
Percent of total loans | 2.00% |  | 2.00% |  |  |
Multifamily construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 663,989 |  | $ 503,993 |  |  |
Percent of total loans | 6.00% |  | 5.00% |  |  |
One- to four- family construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 490,237 |  | $ 526,432 |  |  |
Percent of total loans | 4.00% |  | 5.00% |  |  |
Land and land development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 352,184 |  | $ 336,639 |  |  |
Percent of total loans | 3.00% |  | 3.00% |  |  |
Commercial Business |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 1,298,134 |  | $ 1,255,734 |  |  |
Percent of total loans | 12.00% |  | 12.00% |  |  |
Small business scored |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 1,074,465 |  | $ 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 | $ 334,583 |  | $ 331,089 |  |  |
Allowance for credit losses - loans | $ (4,045) | (3,890) | $ (3,865) | (3,573) | (3,094) | (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 | $ 1,603,266 |  | $ 1,518,046 |  |  |
Allowance for credit losses - loans | $ (20,906) | (20,432) | $ (19,271) | (16,737) | (15,736) | (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 | $ 611,739 |  | $ 588,703 |  |  |
Percent of total loans | 5.00% |  | 5.00% |  |  |
Consumer Loan [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 103,500 |  | $ 110,681 |  |  |
Allowance for credit losses - loans | $ (10,148) | $ (9,518) | $ (9,238) | $ (8,971) | $ (9,009) | $ (8,971)
Percent of total loans | 1.00% |  | 1.00% |  |  |

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