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LOANS RECEIVABLE AND THE ALLOWANCE FOR LOAN LOSSES (Impaired Loans With and Without Specific Reserves) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]      
Document Period End Date Dec. 31, 2019    
Financing Receivable, Collectively Evaluated for Impairment $ 9,257,015 $ 8,650,107  
Impaired Financing Receivable, Unpaid Principal Balance 49,605 31,813  
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 21,780 17,765  
Recorded Investment 24,284 11,311  
Related Allowance 4,374 416  
Impaired Financing Receivable, Average Recorded Investment 29,262 32,033 $ 39,263
Interest Income Recognized 550 787 898
Commerical real estate - owner-occupied [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance 4,185 3,193  
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 3,816 2,768  
Recorded Investment 194 200  
Related Allowance 18 19  
Impaired Financing Receivable, Average Recorded Investment 3,366 3,806 3,697
Interest Income Recognized 7 11 11
Commercial real estate - investment properties [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance 3,536 7,287  
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 1,883 1,320  
Recorded Investment 690 5,606  
Related Allowance 40 226  
Impaired Financing Receivable, Average Recorded Investment 3,982 7,822 9,136
Interest Income Recognized 119 314 195
Multifamily real estate [Member]      
Financing Receivable, Impaired [Line Items]      
Financing Receivable, Collectively Evaluated for Impairment 473,145 368,698  
Impaired Financing Receivable, Unpaid Principal Balance 82 1,901  
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 85 1,427  
Recorded Investment 0 0  
Related Allowance 0 0  
Impaired Financing Receivable, Average Recorded Investment 36 0 251
Interest Income Recognized 0 0 10
Commercial Construction [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Average Recorded Investment 779 115  
Interest Income Recognized 0 0  
Multifamily Construction [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance 573    
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 98    
Recorded Investment 0    
Related Allowance 0    
One-to four-family construction [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance 1,799 919  
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 1,799 919  
Recorded Investment 0 0  
Related Allowance 0 0  
Impaired Financing Receivable, Average Recorded Investment 1,319 778 418
Interest Income Recognized 18 6 27
Land and land development - residential [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance 676 1,134  
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 340 798  
Recorded Investment 0 0  
Related Allowance 0 0  
Impaired Financing Receivable, Average Recorded Investment 657 994 1,396
Interest Income Recognized 0 10 42
Land and land development - commercial [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance   44  
Impaired Financing Receivable, with No Related Allowance, Recorded Investment   44  
Recorded Investment   0  
Related Allowance   0  
Impaired Financing Receivable, Average Recorded Investment 0 4 867
Interest Income Recognized 0 0 0
Commercial business [Member]      
Financing Receivable, Impaired [Line Items]      
Financing Receivable, Collectively Evaluated for Impairment 1,674,125 1,482,195  
Impaired Financing Receivable, Unpaid Principal Balance 25,117 4,014  
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 4,614 2,937  
Recorded Investment 19,330 391  
Related Allowance 4,128 16  
Impaired Financing Receivable, Average Recorded Investment 5,510 3,443 5,996
Interest Income Recognized 26 21 68
Agricultural business, including secured by farmland [Member]      
Financing Receivable, Impaired [Line Items]      
Financing Receivable, Collectively Evaluated for Impairment 367,913 401,082  
Impaired Financing Receivable, Unpaid Principal Balance 3,044 4,863  
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 661 1,751  
Recorded Investment 2,243 2,561  
Related Allowance 141 96  
Impaired Financing Receivable, Average Recorded Investment 3,975 5,501 6,184
Interest Income Recognized 105 102 207
One- to four-family residential [Member]      
Financing Receivable, Impaired [Line Items]      
Financing Receivable, Collectively Evaluated for Impairment 941,158 969,046  
Impaired Financing Receivable, Unpaid Principal Balance 7,290 6,724  
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 5,613 4,314  
Recorded Investment 1,648 2,358  
Related Allowance 41 51  
Impaired Financing Receivable, Average Recorded Investment 6,589 7,845 9,499
Interest Income Recognized 249 302 322
Consumer secured by one- to four-family [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance 3,081 1,622  
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 2,712 1,438  
Recorded Investment 127 133  
Related Allowance 5 6  
Impaired Financing Receivable, Average Recorded Investment 2,694 1,583 1,635
Interest Income Recognized 22 17 9
Consumer Loan [Member]      
Financing Receivable, Impaired [Line Items]      
Impaired Financing Receivable, Unpaid Principal Balance 222 112  
Impaired Financing Receivable, with No Related Allowance, Recorded Investment 159 49  
Recorded Investment 52 62  
Related Allowance 1 2  
Impaired Financing Receivable, Average Recorded Investment 355 142 184
Interest Income Recognized $ 4 $ 4 $ 7