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Loans and Allowance for Credit Losses - Credit impaired loans acquired during the period (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Contractually required payments receivable on PCI loans at acquisition: $ 5,717,000 $ 7,691,000
Cash flows expected to be collected at acquisition 3,715,000 955,000
Purchased credit impaired loans 5,269,000 6,699,000
Related Allowance 307,000 164,000
Purchased Credit Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Contractually required payments receivable on PCI loans at acquisition: 982,000 0
Purchased credit impaired loans 612,000 0
Related Allowance 0 0
Loans acquired during the year 631,000 0
Purchased Credit Impaired Loans [Member] | Commercial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Contractually required payments receivable on PCI loans at acquisition: 982,000 0
Cash flows expected to be collected at acquisition 693,000 0
Purchased credit impaired loans $ 612,000 $ 0