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Non Purchased Loans - Narrative (Details)
9 Months Ended
Sep. 30, 2017
USD ($)
loan_grade
loan
Sep. 30, 2016
USD ($)
loan
Dec. 31, 2016
USD ($)
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]      
Allowance for loan losses attributable to restructured loans | $ $ 44,531,000   $ 42,737,000
Non purchased loans and leases      
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]      
Mortgage and commercial loans discontinued past due period 90 days    
Consumer and other retail loans charged-off past due period 120 days    
Nonperforming loans charged-off past due period 90 days    
Number of restructured loans | loan 3 0  
Restructured loans discontinued past due period 90 days 90 days  
Remaining availability under commitments to lend additional funds on restructured loans | $ $ 0 $ 11,000  
Non purchased loans and leases | Watch      
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]      
Loan grades range (loan grades) 5    
Non purchased loans and leases | Maximum      
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]      
Loan grades range (loan grades) 9    
Non purchased loans and leases | Maximum | Pass      
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]      
Loan grades range (loan grades) 4    
Non purchased loans and leases | Maximum | Substandard      
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]      
Loan grades range (loan grades) 9    
Non purchased loans and leases | Minimum      
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]      
Loan grades range (loan grades) 1    
Non purchased loans and leases | Minimum | Pass      
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]      
Loan grades range (loan grades) 1    
Non purchased loans and leases | Minimum | Substandard      
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]      
Loan grades range (loan grades) 6    
Non purchased loans and leases | Nonaccruing Loans      
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]      
Outstanding balance of restructured loans | $ $ 597,000    
Non purchased loans and leases | Restructured Loans      
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]      
Outstanding balance of restructured loans | $ 4,651,000 6,485,000  
Allowance for loan losses attributable to restructured loans | $ $ 98,000 $ 287,000