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Loans and Leases - Purchased Credit-Impaired Loans (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Receivables [Abstract]    
Outstanding principal balance $ 38,791 $ 46,543
Carrying amount 27,601 30,849
Purchased credit impaired loans without estimate of expected cash flows recorded investment 88 173
Purchased credit impaired became non-performing subsequent to acquisition $ 87 $ 167