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 |