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Loans Held for Investment - Narrative (Details)
9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
area
grade
Dec. 31, 2018
USD ($)
Loans Held for Investment    
Servicing rights retained from guaranteed portion of SBA loans sold $ 7,900,000 $ 8,500,000
Unpaid principal balance for loans and participations serviced for others 646,700,000 635,300,000
Secured loans limit to one borrower 557,500,000  
Unsecured loans limit to one borrower 334,500,000  
Aggregate outstanding balance of loans to one borrower of secured credit $ 125,300,000  
Number of areas where the entity's credit quality is maintained and credit risk managed | area 2  
Number of Pass scale grades | grade 6  
Nonaccrual loans $ 8,105,000 4,857,000
Loans 90 days or more past due and still accruing 0 213,000
Investment in TDR 0 0
Consumer mortgage loans collateralized by residential real estate, foreclosure proceedings in process 0 0
Outstanding balance 1,700,000  
Purchased credit impaired loans, nonaccrual status 0  
Secured Debt    
Loans Held for Investment    
Aggregate outstanding balance of loans to one borrower of secured credit 101,500,000  
Unsecured Debt    
Loans Held for Investment    
Aggregate outstanding balance of loans to one borrower of secured credit 23,800,000  
SBA    
Loans Held for Investment    
Unpaid principal balance for loans and participations serviced for others $ 492,800,000 $ 519,800,000