Securities - Summary of Sale of Debt and Equity Securities (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017
Investments Debt And Equity Securities [Abstract]
Proceeds	$ 5,778	$ 34,299
Gross gains	107	99
Gross losses	$ (105)	$ (57)

The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

No definition available.

Name:	us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration