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Loans and the Allowance for Loan Losses (Details) - Loans held-for-sale - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Loans and the Allowance for Loan and Lease Losses (Details) - Purchase credit impaired loans [Line Items]    
Total carrying amount $ 51,124 $ 78,005
Commercial Portfolio Segment [Member]    
Loans and the Allowance for Loan and Lease Losses (Details) - Purchase credit impaired loans [Line Items]    
Total carrying amount 50,891 70,105
Commercial Real Estate Portfolio Segment [Member]    
Loans and the Allowance for Loan and Lease Losses (Details) - Purchase credit impaired loans [Line Items]    
Total carrying amount 7,712
Residential Real Estate Portfolio Segment [Member]    
Loans and the Allowance for Loan and Lease Losses (Details) - Purchase credit impaired loans [Line Items]    
Total carrying amount $ 233 $ 188