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Loans and Leases - Purchased Credit-Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Receivables [Abstract]    
Outstanding principal balance $ 17,904 $ 46,543
Carrying amount 12,304 30,849
Purchased credit impaired loans without estimate of expected cash flow 0 1,900
Purchased credit-impaired loans $ 0 $ 167