Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parenthetical) - $ / shares	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015
Preferred Stock Series A [Member]
Dividends declared (in dollars per share)	$ 0.32	$ 0.32
Preferred Stock Series D [Member]
Dividends declared (in dollars per share)	$ 0.18	$ 0.18

Aggregate dividends declared during the period for each share of preferred stock outstanding.

No definition available.

Name:	us-gaap_PreferredStockDividendsPerShareDeclared
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration