Deposits - Narrative (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Banking and Thrift [Abstract]
Aggregate amount of certificates of deposit equal to or greater than $100,000	$ 590,600,000	$ 871,200,000
Brokered certificates of deposit	$ 0	$ 0

Amount of interest-bearing domestic third-party deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.12)
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Name:	us-gaap_InterestBearingDomesticDepositBrokered
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant