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Loans and Allowance for Loan Losses - Purchased Credit-Impaired (Details)
$ in Thousands
3 Months Ended 9 Months Ended 81 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Nov. 21, 2017
acquisition
Dec. 31, 2017
USD ($)
Business Acquisitions, Purchased Credit-Impaired Loans [Line Items]            
Number of banks acquired | acquisition         3  
PCI Loans, Carrying Value [Abstract]            
Unpaid Principal Balance $ 2,621   $ 2,621     $ 2,868
Carrying Value 2,129   2,129     2,115
Accretable Yield [Roll Forward]            
Balance at beginning of period 1,059 $ 1,306 1,254 $ 1,476    
Accretion (63) (76) (258) (246)    
Balance at end of period 996 $ 1,230 996 $ 1,230    
Commercial loans | Commercial and industrial            
PCI Loans, Carrying Value [Abstract]            
Unpaid Principal Balance 106   106     276
Carrying Value 39   39     65
Commercial real estate loans | Commercial real estate, owner-occupied            
PCI Loans, Carrying Value [Abstract]            
Unpaid Principal Balance 1,259   1,259     1,297
Carrying Value 1,198   1,198     1,166
Commercial real estate loans | Commercial real estate, investor            
PCI Loans, Carrying Value [Abstract]            
Unpaid Principal Balance 1,041   1,041     1,064
Carrying Value 806   806     790
Residential loans | Home equity            
PCI Loans, Carrying Value [Abstract]            
Unpaid Principal Balance 215   215     231
Carrying Value $ 86   $ 86     $ 94