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Unused Available Lines of Credit (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Unsecured Debt [Member]  
Line of Credit Facility [Line Items]  
Line of credit amount $ 83,000
Unsecured Debt [Member] | US Bank [Member]  
Line of Credit Facility [Line Items]  
Line of credit amount 20,000
Unsecured Debt [Member] | UMB Bank [Member]  
Line of Credit Facility [Line Items]  
Line of credit amount 20,000
Unsecured Debt [Member] | Wells Fargo Bank [Member]  
Line of Credit Facility [Line Items]  
Line of credit amount 15,000
Unsecured Debt [Member] | PNC Bank [Member]  
Line of Credit Facility [Line Items]  
Line of credit amount 12,000
Unsecured Debt [Member] | Frost National Bank [Member]  
Line of Credit Facility [Line Items]  
Line of credit amount 10,000
Unsecured Debt [Member] | JPM Chase Bank [Member]  
Line of Credit Facility [Line Items]  
Line of credit amount 6,000
Secured Debt [Member] | UMB Bank [Member]  
Line of Credit Facility [Line Items]  
Line of credit amount 50,000
Secured Debt [Member] | Federal Home Loan Bank [Member]  
Line of Credit Facility [Line Items]  
Line of credit amount 193,460
Secured Debt [Member] | First Tennessee Bank [Member]  
Line of Credit Facility [Line Items]  
Line of credit amount $ 50,000