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Loans Held for Investment - Narrative (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
area
grade
Dec. 31, 2018
USD ($)
Loans Held for Investment    
Servicing rights retained from guaranteed portion of SBA loans sold $ 8,000,000.0 $ 8,500,000
Unpaid principal balance for loans and participations serviced for others 689,100,000 635,300,000
Secured loans limit to one borrower 547,000,000.0  
Unsecured loans limit to one borrower 328,200,000  
Aggregate outstanding balance of loans to one borrower of secured credit $ 94,100,000  
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 $ 7,637,000 4,857,000
Loans 90 days or more past due and still accruing 3,600,000 213,000
Investment in TDR 0 0
Consumer mortgage loans collateralized by residential real estate, foreclosure proceedings in process 0 0
Outstanding balance 1,800,000  
Purchased credit impaired loans, nonaccrual status 0  
SBA    
Loans Held for Investment    
Unpaid principal balance for loans and participations serviced for others 493,900,000 $ 519,800,000
Commercial and industrial    
Loans Held for Investment    
Loans 90 days or more past due and still accruing 3,400,000  
PCI    
Loans Held for Investment    
Loans 90 days or more past due and still accruing $ 159,000