Financial Information (Schedule of Accounting Changes) (Details) - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
New Accounting Pronouncement or Change in
Other Assets	$ 1,370,832,000	$ 1,370,832,000	$ 1,385,572,000
Other Liabilities	507,894,000	507,894,000	649,359,000
Undivided profits	782,102,000	782,102,000	851,585,000
Other expense	(18,059,000)	424,000
Provision/(benefit) for income taxes	33,578,000	53,644,000
Net Income (Loss) Available to Common Stockholders, Basic	$ 77,520,000	$ 123,136,000
Diluted income/(loss) per share	$ 0.33	$ 0.52
Accounting Standards Update 201401 [Member]
New Accounting Pronouncement or Change in
Other Assets	$ (4,405,000)	$ (4,405,000)	(4,700,000)	$ (5,340,000)
Other Liabilities	6,471,000	6,471,000	4,678,000	7,034,000
Undivided profits	(10,876,000)	(10,876,000)	(9,378,000)	(12,374,000)
Other expense	(2,170,000)	(4,340,000)	(8,680,000)	(10,082,000)	$ (14,177,000)
Provision/(benefit) for income taxes	1,421,000	2,842,000	5,684,000	12,780,000	13,234,000
Net Income (Loss) Available to Common Stockholders, Basic	$ 749,000	$ 1,498,000	$ 2,996,000	$ (2,698,000)	$ 943,000
Diluted income/(loss) per share	$ 0.01	$ 0.01	$ 0.01	$ (0.01)	$ 0