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Other Real Estate Owned - Change in Other Real Estate Owned (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Banking And Thrift [Abstract]      
Other real estate owned, beginning balance $ 16,570 $ 26,715 $ 56,181
Acquisition of OREO through business combination   1,525  
Net additions to OREO 6,266 6,672 13,793
Dispositions of OREO (11,750) (17,389) (33,994)
Valuation adjustments (460) (953) (9,265)
Other real estate owned, ending balance $ 10,626 $ 16,570 $ 26,715