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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%