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Loans and Allowance for Loan Losses - Outstanding principal balance and related carrying amount of acquired loans (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Loans and Allowance for Loan Losses      
Carrying amount $ 8,567 $ 4,457 $ 2,778
Changes in the accretable yield on purchased credit impaired loans      
Balance at beginning of the year 357    
Accretable yield at acquisition date   379  
Accretion (51) (22)  
Balance at end of the year 306 357  
Purchased credit impaired      
Loans and Allowance for Loan Losses      
Outstanding principal balance 2,579 2,533  
Carrying amount 1,846 1,401  
Other acquired loans      
Loans and Allowance for Loan Losses      
Outstanding principal balance 109,511 131,286  
Carrying amount 108,070 129,597  
Acquired Loan Portfolio      
Loans and Allowance for Loan Losses      
Outstanding principal balance 112,090 133,819  
Carrying amount $ 109,916 $ 130,998