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LOANS RECEIVABLE AND THE ALLOWANCE FOR CREDIT LOSSES (Loans by Type) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 9,146,629 | $ 9,084,763 |  |
Allowance for credit losses - loans | (125,471) | (132,099) | $ (156,054) | $ (167,279)
Net loans | $ 9,021,158 | 8,952,664 |  |
Percent of total loans | 100.00% |  |  |
Unearned loan fees in excess of unamortized costs | $ 8,000 | 8,600 |  |
Discount on acquired loans, net | 8,500 | 9,700 |  |
Financing Receivable, Accrued Interest, before Allowance for Credit Loss | 27,600 | 29,200 |  |
Financing Receivable, Troubled Debt Restructuring | 5,500 |  |  |
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | 9,084,763 |  |
Allowance for credit losses - loans |  | (132,099) |  |
Net loans |  | $ 8,952,664 |  |
Percent of total loans |  | 100.00% |  |
Commerical real estate - owner-occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 872,801 | $ 831,623 |  |
Percent of total loans | 9.50% |  |  |
Commerical real estate - owner-occupied [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 831,623 |  |
Percent of total loans |  | 9.20% |  |
Commercial real estate - investment properties |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 1,670,896 | $ 1,674,027 |  |
Percent of total loans | 18.30% |  |  |
Commercial real estate - investment properties | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 1,674,027 |  |
Percent of total loans |  | 18.40% |  |
Small Balance Commercial Real Estate Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 1,162,164 |  |  |
Percent of total loans | 12.70% |  |  |
Small Balance Commercial Real Estate Loans [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 1,281,863 |  |
Percent of total loans |  | 14.10% |  |
Multifamily Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 598,588 | $ 530,885 |  |
Allowance for credit losses - loans | $ (7,183) | (7,043) | (4,367) | (3,893)
Percent of total loans | 6.50% |  |  |
Multifamily Real Estate | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 530,885 |  |
Percent of total loans |  | 5.80% |  |
Commercial construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 179,796 | $ 167,998 |  |
Percent of total loans | 2.00% |  |  |
Commercial construction | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 167,998 |  |
Percent of total loans |  | 1.80% |  |
Multifamily construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 274,015 | $ 259,116 |  |
Percent of total loans | 3.00% |  |  |
Multifamily construction | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 259,116 |  |
Percent of total loans |  | 2.90% |  |
One- to four- family construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 582,800 | $ 568,753 |  |
Percent of total loans | 6.40% |  |  |
One- to four- family construction | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 568,753 |  |
Percent of total loans |  | 6.30% |  |
Land and Land Development Type [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 317,560 |  |  |
Percent of total loans | 3.50% |  |  |
Land and Land Development Type [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 313,454 |  |
Percent of total loans |  | 3.50% |  |
Land and land development - residential [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 317,560 | $ 313,454 |  |
Commercial Business |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 1,139,701 | 1,170,780 |  |
Allowance for credit losses - loans | $ (26,655) | (26,421) | (31,411) | (35,007)
Percent of total loans | 12.50% |  |  |
Loans And LeasesReceivable Gross Carrying Amount, SBA Paycheck Protection Program | $ 57,900 | 132,600 |  |
Commercial Business | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 1,170,780 |  |
Percent of total loans |  | 12.90% |  |
Small business scored |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 817,065 | $ 792,310 |  |
Percent of total loans | 8.80% |  |  |
Small business scored | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 792,310 |  |
Percent of total loans |  | 8.70% |  |
Agricultural business, including secured by farmland |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 245,288 | $ 280,578 |  |
Allowance for credit losses - loans | $ (2,586) | (3,190) | (4,617) | (4,914)
Percent of total loans | 2.70% |  |  |
Loans And LeasesReceivable Gross Carrying Amount, SBA Paycheck Protection Program | $ 708 | 1,400 |  |
Agricultural business, including secured by farmland | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 280,578 |  |
Percent of total loans |  | 3.10% |  |
One- to four-family residential [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 718,403 | $ 657,474 |  |
Allowance for credit losses - loans | $ (8,109) | (8,205) | $ (7,988) | $ (9,913)
Percent of total loans | 7.90% |  |  |
One- to four-family residential [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 657,474 |  |
Percent of total loans |  | 7.20% |  |
Consumer secured by one- to four-family [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 470,485 | $ 458,533 |  |
Percent of total loans | 5.10% |  |  |
Consumer secured by one- to four-family [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 458,533 |  |
Percent of total loans |  | 5.00% |  |
Consumer-other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 97,067 | $ 97,369 |  |
Percent of total loans | 1.10% |  |  |
Consumer-other | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 97,369 |  |
Percent of total loans |  | 1.10% |  |

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