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Purchased Loans (Details Textual)
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
loan
Jun. 30, 2016
USD ($)
loan
Dec. 31, 2016
USD ($)
Loans and Allowance for Loan Losses (Textual) [Abstract]          
Allowance for loan losses attributable to restructured loans $ 44,149,000   $ 44,149,000   $ 42,737,000
Purchased loans          
Loans and Allowance for Loan Losses (Textual) [Abstract]          
Number of restructured loans | loan     7 0  
Average recorded investment in impaired loans 7,836,000 $ 4,397,000 $ 7,684,000 $ 4,363,000  
Remaining availability under commitments to lend additional funds on restructured loans 5,000 0 5,000 0  
Purchased loans | Nonaccruing Loans          
Loans and Allowance for Loan Losses (Textual) [Abstract]          
Outstanding balance of restructured loans 534,000   534,000    
Purchased loans | Restructured Loans          
Loans and Allowance for Loan Losses (Textual) [Abstract]          
Outstanding balance of restructured loans 446,000 4,979,000 446,000 4,979,000  
Allowance for loan losses attributable to restructured loans 27,000 34,000 $ 27,000 $ 34,000  
Non purchased loans and leases          
Loans and Allowance for Loan Losses (Textual) [Abstract]          
Number of restructured loans | loan     1 0  
Restructured loans discontinued past due period (in days)     90 days 90 days  
Average recorded investment in impaired loans 25,726,000 29,233,000 $ 26,148,000 $ 29,791,000  
Remaining availability under commitments to lend additional funds on restructured loans 0 0 0 0  
Non purchased loans and leases | Nonaccruing Loans          
Loans and Allowance for Loan Losses (Textual) [Abstract]          
Outstanding balance of restructured loans 71,000   71,000    
Non purchased loans and leases | Restructured Loans          
Loans and Allowance for Loan Losses (Textual) [Abstract]          
Outstanding balance of restructured loans 4,409,000 5,562,000 4,409,000 5,562,000  
Allowance for loan losses attributable to restructured loans $ 238,000 $ 790,000 $ 238,000 $ 790,000