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Loans and Allowance for Loan Losses - Purchased Credit-Impaired (Details)
$ in Thousands
3 Months Ended 6 Months Ended 81 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Nov. 21, 2017
acquisition
Dec. 31, 2018
USD ($)
Business Acquisitions, Purchased Credit-Impaired Loans [Line Items]            
Number of banks acquired | acquisition         3  
Accretable Yield [Roll Forward]            
Balance at beginning of period $ 875 $ 1,142 $ 934 $ 1,254    
Accretion (56) (83) (115) (195)    
Balance at end of period 819 $ 1,059 819 $ 1,059    
Purchased credit-impaired            
PCI Loans, Carrying Value [Abstract]            
Unpaid Principal Balance 2,502   2,502     $ 2,579
Carrying Value 2,081   2,081     2,112
Purchased credit-impaired | Commercial loans | Commercial and industrial            
PCI Loans, Carrying Value [Abstract]            
Unpaid Principal Balance 64   64     89
Carrying Value 17   17     31
Purchased credit-impaired | Commercial real estate loans | Commercial real estate, owner-occupied            
PCI Loans, Carrying Value [Abstract]            
Unpaid Principal Balance 1,221   1,221     1,247
Carrying Value 1,165   1,165     1,187
Purchased credit-impaired | Commercial real estate loans | Commercial real estate, investor            
PCI Loans, Carrying Value [Abstract]            
Unpaid Principal Balance 1,017   1,017     1,033
Carrying Value 822   822     811
Purchased credit-impaired | Residential loans | Home equity            
PCI Loans, Carrying Value [Abstract]            
Unpaid Principal Balance 200   200     210
Carrying Value $ 77   $ 77     $ 83