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LOANS RECEIVABLE AND THE ALLOWANCE FOR CREDIT LOSSES (Loans by Type) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 10,611,417 |  | $ 10,146,724 |  |  |
Allowance for credit losses - loans | (146,960) | $ (144,680) | (141,465) | $ (135,918) | $ (128,702) | $ (132,099)
Net loans | $ 10,464,457 |  | $ 10,005,259 |  |  |
Percent of total loans | 100.00% |  | 100.00% |  |  |
Unearned loan fees in excess of unamortized costs | $ 11,200 |  | $ 8,100 |  |  |
Discount on acquired loans, net | 5,100 |  | 6,600 |  |  |
Financing Receivable, Accrued Interest, before Allowance for Credit Loss | 45,500 |  | 39,800 |  |  |
Financing Receivable, Loans Held as Collateral, FHLB and Other Borrowings | 7,200,000 |  |  |  |  |
Commerical real estate - owner-occupied [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 911,540 |  | $ 845,320 |  |  |
Percent of total loans | 8.60% |  | 8.30% |  |  |
Commercial real estate - investment properties |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 1,530,087 |  | $ 1,589,975 |  |  |
Percent of total loans | 14.40% |  | 15.70% |  |  |
Small Balance Commercial Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 1,169,828 |  | $ 1,200,251 |  |  |
Percent of total loans | 11.00% |  | 11.80% |  |  |
Multifamily Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 766,571 |  | $ 645,071 |  |  |
Allowance for credit losses - loans | $ (8,804) | (8,039) | $ (7,734) | (7,114) | (6,906) | (7,043)
Percent of total loans | 7.20% |  | 6.40% |  |  |
Commercial construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 168,061 |  | $ 184,876 |  |  |
Percent of total loans | 1.60% |  | 1.80% |  |  |
Multifamily construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 453,129 |  | $ 325,816 |  |  |
Percent of total loans | 4.30% |  | 3.20% |  |  |
One- to four- family construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 536,349 |  | $ 647,329 |  |  |
Percent of total loans | 5.10% |  | 6.40% |  |  |
Land and land development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 346,362 |  | $ 328,475 |  |  |
Percent of total loans | 3.30% |  | 3.20% |  |  |
Commercial Business |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 1,263,747 |  | $ 1,283,407 |  |  |
Percent of total loans | 11.90% |  | 12.70% |  |  |
Loans And LeasesReceivable Gross Carrying Amount, SBA Paycheck Protection Program | $ 4,100 |  | $ 7,600 |  |  |
Small business scored |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 1,000,714 |  | $ 947,092 |  |  |
Percent of total loans | 9.40% |  | 9.30% |  |  |
Agricultural business, including secured by farmland |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 334,626 |  | $ 295,077 |  |  |
Allowance for credit losses - loans | $ (3,718) | (3,573) | $ (3,475) | (3,455) | (3,002) | (3,190)
Percent of total loans | 3.10% |  | 2.90% |  |  |
Loans And LeasesReceivable Gross Carrying Amount, SBA Paycheck Protection Program | $ 0 |  | $ 334 |  |  |
One- to four-family residential [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | 1,438,694 |  | 1,173,112 |  |  |
Allowance for credit losses - loans | $ (17,925) | (16,737) | $ (14,729) | (12,394) | (9,573) | (8,205)
Percent of total loans | 13.60% |  | 11.60% |  |  |
Consumer—home equity revolving lines of credit |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 579,836 |  | $ 566,291 |  |  |
Percent of total loans | 5.40% |  | 5.60% |  |  |
Consumer-other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and Leases Receivable, Gross | $ 111,873 |  | $ 114,632 |  |  |
Allowance for credit losses - loans | $ (9,043) | $ (8,971) | $ (8,971) | $ (8,751) | $ (7,236) | $ (6,951)
Percent of total loans | 1.10% |  | 1.10% |  |  |

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