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Loans Held for Investment - Purchased Credit Impaired Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Loans Held for Investment    
Total purchased credit impaired $ 17,210 $ 17,440
Business loans | Commercial and industrial    
Loans Held for Investment    
Total purchased credit impaired 3,099 1,071
Business loans | Commercial owner occupied    
Loans Held for Investment    
Total purchased credit impaired 1,427 628
Business loans | SBA    
Loans Held for Investment    
Total purchased credit impaired 3,320 7,598
Real estate loans | Commercial non-owner occupied    
Loans Held for Investment    
Total purchased credit impaired 1,351  
Acquired Banks    
Loans Held for Investment    
Total purchased credit impaired 1,731 2,182
Acquired Banks | Business loans | Commercial and industrial    
Loans Held for Investment    
Total purchased credit impaired 0 10
Acquired Banks | Business loans | Commercial owner occupied    
Loans Held for Investment    
Total purchased credit impaired 577 632
Acquired Banks | Business loans | SBA    
Loans Held for Investment    
Total purchased credit impaired 1,154 1,265
Acquired Banks | Real estate loans | Commercial non-owner occupied    
Loans Held for Investment    
Total purchased credit impaired $ 0 $ 275