Subordinated Debentures Held by Subsidiary Trusts - Financial Insruments Subject to Mandatory Redemption (Details) - Trusts $ in Thousands	Dec. 31, 2015 USD ($)
Trust Preferred Securities Subject to Mandatory Redemption
Financial Instruments Subject to Mandatory Redemption by Settlement Terms
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount	$ 80,000
Common Stock Subject to Mandatory Redemption
Financial Instruments Subject to Mandatory Redemption by Settlement Terms
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount	$ 2,477

Amount that would be paid, determined under the conditions specified in the contract, if the holder of the share has the right to redeem the shares.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 480
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6940734&loc=d3e22047-110879

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