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LOANS RECEIVABLE AND THE ALLOWANCE FOR CREDIT LOSSES (Loans by Type) (Details) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 9,947,697,000 | $ 9,870,982,000 |  |
Allowance for credit losses - loans | (156,054,000) | (167,279,000) | $ (130,488,000) | $ (100,559,000)
Net loans | $ 9,791,643,000 | 9,703,703,000 |  |
Percent of total loans | 100.00% |  |  |
Unearned loan fees in excess of unamortized costs | $ 35,500,000 | 25,600,000 |  |
Discount on acquired loans, net | 13,900,000 | 16,100,000 |  |
Financing Receivable, Accrued Interest, before Allowance for Credit Loss | 38,200,000 | 36.6 |  |
Financing Receivable, Troubled Debt Restructuring | 7,600,000 | 7,900,000 |  |
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | 9,870,982,000 |  |
Allowance for credit losses - loans |  | (167,279,000) |  |
Net loans |  | $ 9,703,703,000 |  |
Percent of total loans |  | 100.00% |  |
Commerical real estate - owner-occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 1,045,656,000 | $ 1,076,467,000 |  |
Percent of total loans | 10.50% |  |  |
Commerical real estate - owner-occupied [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 1,076,467,000 |  |
Percent of total loans |  | 10.90% |  |
Commercial real estate - investment properties |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 1,931,805,000 | $ 1,955,684,000 |  |
Percent of total loans | 19.40% |  |  |
Commercial real estate - investment properties | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 1,955,684,000 |  |
Percent of total loans |  | 19.80% |  |
Small Balance Commercial Real Estate Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 639,330,000 |  |  |
Percent of total loans | 6.40% |  |  |
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 |  | $ 573,849,000 |  |
Percent of total loans |  | 5.80% |  |
Multifamily Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 433,775,000 | $ 428,223,000 |  |
Allowance for credit losses - loans | $ (4,367,000) | (3,893,000) | (2,805,000) | (4,754,000)
Percent of total loans | 4.30% |  |  |
Multifamily Real Estate | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 428,223,000 |  |
Percent of total loans |  | 4.40% |  |
Commercial construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 199,037,000 | $ 228,937,000 |  |
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 |  | $ 228,937,000 |  |
Percent of total loans |  | 2.30% |  |
Multifamily construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 305,694,000 | $ 305,527,000 |  |
Percent of total loans | 3.10% |  |  |
Multifamily construction | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 305,527,000 |  |
Percent of total loans |  | 3.10% |  |
One- to four- family construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 542,840,000 | $ 507,810,000 |  |
Percent of total loans | 5.50% |  |  |
One- to four- family construction | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 507,810,000 |  |
Percent of total loans |  | 5.10% |  |
Land and Land Development Type [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 266,730,000 |  |  |
Percent of total loans | 2.70% |  |  |
Land and Land Development Type [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 248,915,000 |  |
Percent of total loans |  | 2.50% |  |
Land and land development - residential [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 266,730,000 | $ 248,915,000 |  |
Commercial Business |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | 2,376,594,000 | 2,178,461,000 |  |
Allowance for credit losses - loans | $ (31,411,000) | (35,007,000) | (31,648,000) | (23,370,000)
Percent of total loans | 23.90% |  |  |
Commercial Business | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 2,178,461,000 |  |
Percent of total loans |  | 22.10% |  |
Small business scored |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 717,502,000 | $ 743,451,000 |  |
Percent of total loans | 7.20% |  |  |
Small business scored | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 743,451,000 |  |
Percent of total loans |  | 7.50% |  |
Agricultural business, including secured by farmland |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 262,410,000 | $ 299,949,000 |  |
Allowance for credit losses - loans | $ (4,617,000) | (4,914,000) | (4,513,000) | (4,120,000)
Percent of total loans | 2.60% |  |  |
Agricultural business, including secured by farmland | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 299,949,000 |  |
Percent of total loans |  | 3.00% |  |
One- to four-family residential [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 655,627,000 | $ 717,939,000 |  |
Allowance for credit losses - loans | $ (7,988,000) | (9,913,000) | $ (11,884,000) | $ (4,136,000)
Percent of total loans | 6.60% |  |  |
One- to four-family residential [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 717,939,000 |  |
Percent of total loans |  | 7.30% |  |
Consumer secured by one- to four-family [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 466,132,000 | $ 491,812,000 |  |
Percent of total loans | 4.70% |  |  |
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 |  | $ 491,812,000 |  |
Percent of total loans |  | 5.00% |  |
Consumer Loan [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable | $ 104,565,000 | $ 113,958,000 |  |
Percent of total loans | 1.10% |  |  |
Consumer Loan [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable |  | $ 113,958,000 |  |
Percent of total loans |  | 1.20% |  |

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