Consolidated Statements Of Changes In Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015
Common stock dividends per share, declared	$ 0.20	$ 0.20
Series A 3% Preferred Stock [Member]
Preferred stock dividends per share, declared	$ 0.75	0.75
Preferred stock, dividend percentage	3.00%
Series B-1 8.48% Preferred Stock [Member]
Preferred stock dividends per share, declared	$ 2.12	$ 2.12
Preferred stock, dividend percentage	8.48%

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

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