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Non Purchased Loans - (Details Textual)
6 Months Ended
Jun. 30, 2017
USD ($)
loan
loan_grade
Jun. 30, 2016
USD ($)
loan
Dec. 31, 2016
USD ($)
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]      
Allowance for loan losses attributable to restructured loans | $ $ 44,149,000   $ 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 (in days) 90 days    
Consumer and other retail loans charged-off past due period (in days) 120 days    
Nonperforming loans charged-off past due period (in days) 90 days    
Number of restructured loans | loan 1 0  
Restructured loans discontinued past due period (in days) 90 days 90 days  
Remaining availability under commitments to lend additional funds on restructured loans | $ $ 0 $ 0  
Non purchased loans and leases | Watch      
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]      
Loan grades range (loan grade) 5    
Non purchased loans and leases | Maximum      
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]      
Loan grades range (loan grade) 9    
Non purchased loans and leases | Maximum | Pass      
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]      
Loan grades range (loan grade) 4    
Non purchased loans and leases | Maximum | Substandard      
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]      
Loan grades range (loan grade) 9    
Non purchased loans and leases | Minimum      
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]      
Loan grades range (loan grade) 1    
Non purchased loans and leases | Minimum | Pass      
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]      
Loan grades range (loan grade) 1    
Non purchased loans and leases | Minimum | Substandard      
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]      
Loan grades range (loan grade) 6    
Non purchased loans and leases | Nonaccruing Loans      
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]      
Outstanding balance of restructured loans | $ $ 71,000    
Non purchased loans and leases | Restructured Loans      
Loans and Allowance for Loan Losses (Additional Textual) [Abstract]      
Outstanding balance of restructured loans | $ 4,409,000 5,562,000  
Allowance for loan losses attributable to restructured loans | $ $ 238,000 $ 790,000