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LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Loans by Type) (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 10,810,455,000 | $ 10,146,724,000 |  |
Allowance for credit losses – loans | (149,643,000) | (141,465,000) | $ (132,099,000) | $ (167,279,000)
Net loans receivable | $ 10,660,812,000 | $ 10,005,259,000 |  |
Percent of total loans | 100.00% | 100.00% |  |
Unearned loan fees in excess of unamortized costs | $ (12,100,000) | $ (8,100,000) |  |
Discount on acquired loans, net | 4,600,000 | 6,600,000 |  |
Financing Receivable, Accrued Interest, before Allowance for Credit Loss | 47,800,000 | 39,800,000 |  |
Loans Receivable, Pledged | 7,600,000,000 | 6,500,000,000 |  |
Related party loans | 708,000 | 683,000 |  |
Commerical real estate - owner-occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 915,897,000 | $ 845,320,000 |  |
Percent of total loans | 9.00% | 8.00% |  |
Commercial real estate - investment properties [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 1,541,344,000 | $ 1,589,975,000 |  |
Percent of total loans | 14.00% | 16.00% |  |
Small Balance Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 1,178,500,000 | $ 1,200,251,000 |  |
Percent of total loans | 11.00% | 12.00% |  |
Multifamily real estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 811,232,000 | $ 645,071,000 |  |
Allowance for credit losses – loans | $ (9,326,000) | $ (7,734,000) | (7,043,000) | (3,893,000)
Percent of total loans | 8.00% | 6.00% |  |
Commercial Construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 170,011,000 | $ 184,876,000 |  |
Percent of total loans | 1.00% | 2.00% |  |
Multifamily construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 503,993,000 | $ 325,816,000 |  |
Percent of total loans | 5.00% | 3.00% |  |
One-to four-family construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 526,432,000 | $ 647,329,000 |  |
Percent of total loans | 5.00% | 6.00% |  |
Land and Land Development Type |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 336,639,000 | $ 328,475,000 |  |
Percent of total loans | 3.00% | 3.00% |  |
Commercial business [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 1,255,734,000 | $ 1,283,407,000 |  |
Allowance for credit losses – loans | $ (35,464,000) | $ (33,299,000) | (26,421,000) | (35,007,000)
Percent of total loans | 11.00% | 13.00% |  |
Loans And LeasesReceivable Gross Carrying Amount, SBA Paycheck Protection Program | $ 3,600,000 | $ 7,600,000 |  |
Small Credit-Scored Business Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 1,022,154,000 | $ 947,092,000 |  |
Percent of total loans | 10.00% | 9.00% |  |
Agricultural business, including secured by farmland [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 331,089,000 | $ 295,077,000 |  |
Allowance for credit losses – loans | $ (3,865,000) | $ (3,475,000) | (3,190,000) | (4,914,000)
Percent of total loans | 3.00% | 3.00% |  |
One- to four-family residential [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 1,518,046,000 | $ 1,173,112,000 |  |
Allowance for credit losses – loans | $ (19,271,000) | $ (14,729,000) | $ (8,205,000) | $ (9,913,000)
Percent of total loans | 14.00% | 12.00% |  |
Consumer secured by one- to four-family [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 588,703,000 | $ 566,291,000 |  |
Percent of total loans | 5.00% | 6.00% |  |
Consumer Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and Leases Receivable, Gross | $ 110,681,000 | $ 114,632,000 |  |
Percent of total loans | 1.00% | 1.00% |  |

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