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LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Loans by Type) (Details) - USD ($) | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of total loans | 100.00% | 100.00% |  |
Unearned loan fees in excess of unamortized costs | $ (15,500,000) | $ (12,100,000) |  |
Discount on acquired loans, net | 3,500,000 | 4,600,000 |  |
Financing Receivable, Accrued Interest, before Allowance for Credit Loss | 47,700,000 | 47,800,000 |  |
Loans Receivable, Pledged | 7,900,000,000 | 7,600,000,000 |  |
Related party loans | 682,600 | 708,000 |  |
Financing Receivable, before Allowance for Credit Loss | 11,354,656,000 | 10,810,455,000 |  |
Financing Receivable, Allowance for Credit Loss | (155,521,000) | (149,643,000) | $ (141,465,000) | $ (132,099,000)
Financing Receivable, after Allowance for Credit Loss | $ 11,199,135,000 | $ 10,660,812,000 |  |
Commerical real estate - owner-occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of total loans | 9.00% | 8.00% |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,027,426,000 | $ 915,897,000 |  |
Commercial real estate - investment properties [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of total loans | 14.00% | 14.00% |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,623,672,000 | $ 1,541,344,000 |  |
Small Balance Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of total loans | 11.00% | 11.00% |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 1,178,500,000 |  |
Multifamily real estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of total loans | 8.00% | 8.00% |  |
Financing Receivable, before Allowance for Credit Loss | $ 894,425,000 | $ 811,232,000 |  |
Financing Receivable, Allowance for Credit Loss | $ (10,308,000) | $ (9,326,000) | (7,734,000) | (7,043,000)
Commercial Construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of total loans | 1.00% | 2.00% |  |
Financing Receivable, before Allowance for Credit Loss | $ 122,362,000 | $ 170,011,000 |  |
Multifamily construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of total loans | 5.00% | 5.00% |  |
Financing Receivable, before Allowance for Credit Loss | $ 513,706,000 | $ 503,993,000 |  |
One-to four-family construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of total loans | 5.00% | 5.00% |  |
Financing Receivable, before Allowance for Credit Loss | $ 514,220,000 | $ 526,432,000 |  |
Land and Land Development Type |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of total loans | 3.00% | 3.00% |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 336,639,000 |  |
Commercial business [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of total loans | 11.00% | 12.00% |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,318,333,000 | $ 1,255,734,000 |  |
Financing Receivable, Allowance for Credit Loss | $ (38,611,000) | $ (35,464,000) | (33,299,000) | (26,421,000)
Small Credit-Scored Business Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of total loans | 10.00% | 9.00% |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,104,117,000 | $ 1,022,154,000 |  |
Agricultural business, including secured by farmland [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of total loans | 3.00% | 3.00% |  |
Financing Receivable, before Allowance for Credit Loss | $ 340,280,000 | $ 331,089,000 |  |
Financing Receivable, Allowance for Credit Loss | $ (5,727,000) | $ (3,865,000) | (3,475,000) | (3,190,000)
One- to four-family residential [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of total loans | 14.00% | 14.00% |  |
Financing Receivable, before Allowance for Credit Loss | $ 1,591,260,000 | $ 1,518,046,000 |  |
Financing Receivable, Allowance for Credit Loss | $ (20,807,000) | $ (19,271,000) | $ (14,729,000) | $ (8,205,000)
Consumer secured by one- to four-family [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of total loans | 5.00% | 5.00% |  |
Financing Receivable, before Allowance for Credit Loss |  | $ 588,703,000 |  |
Consumer Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Percent of total loans | 1.00% | 1.00% |  |
Financing Receivable, before Allowance for Credit Loss | $ 95,720,000 | $ 110,681,000 |  |
Financing Receivable [Member] | Commerical real estate - owner-occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,027,426,000 |  |  |
Financing Receivable [Member] | Commercial real estate - investment properties [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,623,672,000 |  |  |
Financing Receivable [Member] | Small Balance Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,213,792,000 |  |  |
Financing Receivable [Member] | Multifamily real estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 894,425,000 |  |  |
Financing Receivable [Member] | Commercial Construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 122,362,000 |  |  |
Financing Receivable [Member] | Multifamily construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 513,706,000 |  |  |
Financing Receivable [Member] | One-to four-family construction [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 514,220,000 |  |  |
Financing Receivable [Member] | Land and Land Development Type |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 369,663,000 |  |  |
Financing Receivable [Member] | Commercial business [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,318,333,000 |  |  |
Financing Receivable [Member] | Small Credit-Scored Business Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,104,117,000 |  |  |
Financing Receivable [Member] | Agricultural business, including secured by farmland [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 340,280,000 |  |  |
Financing Receivable [Member] | One- to four-family residential [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 1,591,260,000 |  |  |
Financing Receivable [Member] | Consumer secured by one- to four-family [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | 625,680,000 |  |  |
Financing Receivable [Member] | Consumer Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing Receivable, before Allowance for Credit Loss | $ 95,720,000 |  |  |

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