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Loans Receivable and the Allowance for Credit Losses - Composition of Loans by Lending Classification (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, gross $ 3,425,762   $ 3,451,266    
Allowance for credit losses (51,187) $ (29,079) (29,079) $ (29,652) $ (29,307)
Total loans held for investment, net 3,374,575   3,422,187    
Loans pledged for Federal Home Loan Bank debt 918,200   945,900    
Loans and leases receivable, impaired, commitment to lend 0        
Agricultural          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, gross 145,435   140,446    
Allowance for credit losses (1,146) (3,748) (3,748) (3,691) (3,637)
Total loans held for investment, net 145,435        
Commercial and industrial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, gross 864,702   835,236    
Allowance for credit losses (19,309) (8,394) (8,394) (7,594) (7,478)
Total loans held for investment, net 864,702        
Commercial real estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, gross 1,780,446   1,814,859    
Allowance for credit losses (23,138) (13,804) (13,804) (14,798) (15,635)
Commercial real estate | Construction & development          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, gross 282,921   298,077    
Total loans held for investment, net 282,921        
Commercial real estate | Farmland          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, gross 168,777   181,885    
Total loans held for investment, net 168,777        
Commercial real estate | Multifamily          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, gross 217,108   227,407    
Total loans held for investment, net 217,108        
Commercial real estate | Commercial real estate-other          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, gross 1,111,640   1,107,490    
Total loans held for investment, net 1,111,640        
Residential real estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, gross 554,290   577,799    
Allowance for credit losses (6,425) (2,685) (2,685) (3,272) (2,349)
Residential real estate | One- to four- family first liens          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, gross 389,055   407,418    
Total loans held for investment, net 389,055        
Residential real estate | One- to four- family junior liens          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, gross 165,235   170,381    
Total loans held for investment, net 165,235        
Consumer          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans, gross 80,889   82,926    
Allowance for credit losses (1,169) $ (448) $ (448) $ (297) $ (208)
Total loans held for investment, net $ 80,889