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LOANS RECEIVABLE AND THE ALLOWANCE FOR CREDIT LOSSES (Loans by Type) (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 9,827,096 |  | $ 9,084,763 |  |  |
Allowance for credit losses - loans | (135,918) | $ (128,702) | (132,099) | $ (139,915) | $ (148,009) | $ (167,279)
Net loans | $ 9,691,178 |  | $ 8,952,664 |  |  |
Percent of total loans | 100.00% |  | 100.00% |  |  |
Unearned loan fees in excess of unamortized costs | $ (7,200) |  | $ (8,600) |  |  |
Discount on acquired loans, net | (7,000) |  | (9,700) |  |  |
Financing Receivable, Accrued Interest, before Allowance for Credit Loss | 33,600 |  | 29,200 |  |  |
Commerical real estate - owner-occupied [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 862,792 |  | $ 831,623 |  |  |
Percent of total loans | 8.80% |  | 9.20% |  |  |
Commercial real estate - investment properties |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 1,604,881 |  | $ 1,674,027 |  |  |
Percent of total loans | 16.30% |  | 18.40% |  |  |
Small Balance Commercial Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 1,188,351 |  | $ 1,281,863 |  |  |
Percent of total loans | 12.10% |  | 14.10% |  |  |
Multifamily Real Estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 592,834 |  | $ 530,885 |  |  |
Allowance for credit losses - loans | $ (7,114) | (6,906) | $ (7,043) | (6,657) | (5,807) | (3,893)
Percent of total loans | 6.00% |  | 5.80% |  |  |
Commercial construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 171,029 |  | $ 167,998 |  |  |
Percent of total loans | 1.70% |  | 1.80% |  |  |
Multifamily construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 275,488 |  | $ 259,116 |  |  |
Percent of total loans | 2.80% |  | 2.90% |  |  |
One- to four- family construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 666,350 |  | $ 568,753 |  |  |
Percent of total loans | 6.80% |  | 6.30% |  |  |
Land and Land Development Type [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 329,459 |  | $ 313,454 |  |  |
Percent of total loans | 3.40% |  | 3.50% |  |  |
Land and land development - residential [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 329,459 |  | $ 313,454 |  |  |
Commercial Business |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 1,242,550 |  | 1,170,780 |  |  |
Allowance for credit losses - loans | $ (31,854) | (28,673) | $ (26,421) | (26,873) | (30,830) | (35,007)
Percent of total loans | 12.70% |  | 12.90% |  |  |
Loans And LeasesReceivable Gross Carrying Amount, SBA Paycheck Protection Program | $ 13,100 |  | $ 132,600 |  |  |
Small business scored |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 906,647 |  | $ 792,310 |  |  |
Percent of total loans | 9.20% |  | 8.70% |  |  |
Agricultural business, including secured by farmland |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 299,400 |  | $ 280,578 |  |  |
Allowance for credit losses - loans | $ (3,455) | (3,002) | $ (3,190) | (3,177) | (3,256) | (4,914)
Percent of total loans | 3.00% |  | 3.10% |  |  |
Loans And LeasesReceivable Gross Carrying Amount, SBA Paycheck Protection Program | $ 344 |  | $ 1,400 |  |  |
One- to four-family residential [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | 1,025,143 |  | 657,474 |  |  |
Allowance for credit losses - loans | $ (12,394) | $ (9,573) | $ (8,205) | $ (9,460) | $ (9,800) | $ (9,913)
Percent of total loans | 10.40% |  | 7.20% |  |  |
Consumer secured by one- to four-family [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 545,807 |  | $ 458,533 |  |  |
Percent of total loans | 5.60% |  | 5.00% |  |  |
Consumer Loan [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable | $ 116,365 |  | $ 97,369 |  |  |
Percent of total loans | 1.20% |  | 1.10% |  |  |

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