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LOANS RECEIVABLE AND THE ALLOWANCE FOR CREDIT LOSSES (Loans by Type) (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percent of total loans | 100.00% | 100.00%
Unearned loan fees in excess of unamortized costs | $ 15,400 | $ 15,500
Discount on acquired loans, net | 3,200 | 3,500
Financing Receivable, Accrued Interest, before Allowance for Credit Loss | 51,000 | 47,700
Financing Receivable, Loans Held as Collateral, FHLB and Other Borrowings | 8,100,000 | 7,900,000
Financing Receivable, before Allowance for Credit Loss | 11,438,796 | 11,354,656
Financing Receivable, after Allowance for Credit Loss | $ 11,281,473 | $ 11,199,135
Commerical real estate - owner-occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percent of total loans | 9.00% | 9.00%
Financing Receivable, before Allowance for Credit Loss | $ 1,020,829 | $ 1,027,426
Commercial real estate - investment properties |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percent of total loans | 14.00% | 14.00%
Financing Receivable, before Allowance for Credit Loss | $ 1,598,387 | $ 1,623,672
Small balance CRE |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percent of total loans | 10.00% | 11.00%
Financing Receivable, before Allowance for Credit Loss | $ 1,217,458 | $ 1,213,792
Multifamily Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percent of total loans | 8.00% | 8.00%
Financing Receivable, before Allowance for Credit Loss | $ 877,716 | $ 894,425
Commercial construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percent of total loans | 1.00% | 1.00%
Financing Receivable, before Allowance for Credit Loss | $ 146,467 | $ 122,362
Multifamily construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percent of total loans | 6.00% | 5.00%
Financing Receivable, before Allowance for Credit Loss | $ 618,942 | $ 513,706
One- to four- family construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percent of total loans | 5.00% | 5.00%
Financing Receivable, before Allowance for Credit Loss | $ 504,265 | $ 514,220
Land and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percent of total loans | 3.00% | 3.00%
Financing Receivable, before Allowance for Credit Loss | $ 396,009 | $ 369,663
Commercial Business |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percent of total loans | 11.00% | 11.00%
Financing Receivable, before Allowance for Credit Loss | $ 1,283,754 | $ 1,318,333
Small business scored |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percent of total loans | 10.00% | 10.00%
Financing Receivable, before Allowance for Credit Loss | $ 1,122,550 | $ 1,104,117
Agricultural business, including secured by farmland |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percent of total loans | 3.00% | 3.00%
Financing Receivable, before Allowance for Credit Loss | $ 334,899 | $ 340,280
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 | $ 1,600,283 | $ 1,591,260
Consumer—home equity revolving lines of credit |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percent of total loans | 5.00% | 5.00%
Financing Receivable, before Allowance for Credit Loss | $ 620,483 | $ 625,680
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 | $ 96,754 | $ 95,720

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