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Deposits - Narrative (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Aggregate amount of time deposits in denominations of $250 thousand or more $ 234,400,000 $ 253,700,000
Certificates of Deposit    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Certificate of deposit to secure deposits, carrying value $ 0 $ 0