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LOANS RECEIVABLE AND THE ALLOWANCE FOR CREDIT LOSSES (Loans by Type) (Details) - USD ($) $ in Thousands | Sep. 30, 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 | $ 16,500 | $ 15,500
Discount on acquired loans, net | 2,700 | 3,500
Financing Receivable, Accrued Interest, before Allowance for Credit Loss | 53,300 | 47,700
Financing Receivable, Loans Held as Collateral, FHLB and Other Borrowings | 8,200,000 | 7,900,000
Financing Receivable, before Allowance for Credit Loss | 11,702,538 | 11,354,656
Financing Receivable, after Allowance for Credit Loss | $ 11,542,831 | $ 11,199,135
Commerical real estate - owner-occupied [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percent of total loans | 10.00% | 9.00%
Financing Receivable, before Allowance for Credit Loss | $ 1,134,559 | $ 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 | $ 1,652,141 | $ 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 | $ 1,210,357 | $ 1,213,792
Multifamily Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percent of total loans | 7.00% | 8.00%
Financing Receivable, before Allowance for Credit Loss | $ 860,650 | $ 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 | $ 144,125 | $ 122,362
Multifamily construction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percent of total loans | 5.00% | 5.00%
Financing Receivable, before Allowance for Credit Loss | $ 586,104 | $ 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 | $ 578,128 | $ 514,220
Land and land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Percent of total loans | 4.00% | 3.00%
Financing Receivable, before Allowance for Credit Loss | $ 427,348 | $ 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 | $ 1,254,460 | $ 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 | $ 1,176,889 | $ 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 | $ 354,884 | $ 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 | $ 1,582,605 | $ 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 | $ 649,188 | $ 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 | $ 91,100 | $ 95,720

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