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Loans and the Allowance for Loan Losses (Details) - Loans held-for-sale - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Loans and the Allowance for Loan and Lease Losses (Details) - Purchase credit impaired loans [Line Items]    
Total carrying amount $ 33,245
Commercial Portfolio Segment [Member]    
Loans and the Allowance for Loan and Lease Losses (Details) - Purchase credit impaired loans [Line Items]    
Total carrying amount 2,294
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 29,353
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 $ 1,598