Borrowings - Schedule Of Securities Financing Transactions (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Mortgage-backed securities of U.S. Government Sponsored Entities [Member]
Short-term Debt [Line Items]
Mortgage-backed securities and collateralized mortgage obligations of U.S. Government Sponsored Entities	$ 216,094	$ 204,202	$ 172,005

Fair value of securities pledged as collateral against securities sold under agreement to repurchase.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226013-175313

Name:	us-gaap_SecuritiesSoldUnderAgreementsToRepurchaseFairValueOfCollateral
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant