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Loans and Allowance for Loan Losses - Table of loan payment estimates (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Acquired credit impaired loans            
Contractual loan payments receivable, estimates of amounts not expected to be collected, other fair value adjustments and the resulting fair values of acquired loans            
Allowance for loan losses on acquired loans $ (5,318) $ (3,968) $ (4,623) $ (4,604) $ (4,426) $ (4,627)
Contractual principal and interest 496,141 666,040   626,691    
Non-accretable difference (15,292) (38,422)   (24,818)    
Cash flows expected to be collected 480,849 627,618   601,873    
Accretable Yield (90,135) (114,985)   (116,754)    
Acquired loans, net 390,714 512,633   485,119   618,803
Acquired non-credit impaired loans accounted under FASB 310 20            
Contractual loan payments receivable, estimates of amounts not expected to be collected, other fair value adjustments and the resulting fair values of acquired loans            
Contractual principal and interest 2,000,000 2,800,000        
After fair value adjustment 2,000,000 2,800,000        
Fair value adjustment 24,200 37,100        
Acquired credit impaired loans accounted under FASB 310 30            
Contractual loan payments receivable, estimates of amounts not expected to be collected, other fair value adjustments and the resulting fair values of acquired loans            
Allowance for loan losses on acquired loans (5,318) (3,968)   (4,604)    
Acquired loans, net 390,714 512,633   485,119    
Residential real estate | Acquired credit impaired loans            
Contractual loan payments receivable, estimates of amounts not expected to be collected, other fair value adjustments and the resulting fair values of acquired loans            
Allowance for loan losses on acquired loans (2,702) (2,311) (2,346) (2,246) (2,514) (3,553)
Consumer loans | Acquired credit impaired loans            
Contractual loan payments receivable, estimates of amounts not expected to be collected, other fair value adjustments and the resulting fair values of acquired loans            
Allowance for loan losses on acquired loans (461) (546) (470) (761) (572) (461)
Commercial and industrial | Acquired credit impaired loans            
Contractual loan payments receivable, estimates of amounts not expected to be collected, other fair value adjustments and the resulting fair values of acquired loans            
Allowance for loan losses on acquired loans   (79)   (79) (128) (145)
Construction and land development | Commercial non-owner occupied real estate | Acquired credit impaired loans            
Contractual loan payments receivable, estimates of amounts not expected to be collected, other fair value adjustments and the resulting fair values of acquired loans            
Allowance for loan losses on acquired loans (760) (340) (798) (717) (576) (180)
Other commercial non-owner occupied real estate | Commercial non-owner occupied real estate | Acquired credit impaired loans            
Contractual loan payments receivable, estimates of amounts not expected to be collected, other fair value adjustments and the resulting fair values of acquired loans            
Allowance for loan losses on acquired loans $ (1,395) $ (692) $ (1,009) $ (801) $ (636) $ (288)