CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Interest receivable - Consolidated Trusts amount	$ 66,312	$ 106,874
Accrued interest payable - Consolidated Trusts amount	36,383	48,355
Series A Preferred Stock [Member]
Preferred stock, par value	$ 25	$ 25
Preferred stock, shares authorized	2,400,000	2,400,000
Preferred Stock, shares issued	2,400,000	2,400,000
Preferred Stock, shares outstanding	2,400,000	2,400,000
Series B Preferred Stock [Member]
Preferred stock, par value	$ 25	$ 25
Preferred stock, shares authorized	3,000,000	3,000,000
Preferred Stock, shares issued	3,000,000	3,000,000
Preferred Stock, shares outstanding	3,000,000	3,000,000
Series C Preferred Stock [Member]
Preferred stock, par value	$ 25	$ 25
Preferred stock, shares authorized	3,000,000	3,000,000
Preferred Stock, shares issued	3,000,000	3,000,000
Preferred Stock, shares outstanding	3,000,000	3,000,000
Common Class A, Voting [Member]
Common stock, par value	$ 1	$ 1
Common stock, shares outstanding	1,030,780	1,030,780
Common Class B, Voting [Member]
Common stock, par value	$ 1	$ 1
Common stock, shares outstanding	500,301	500,301
Common Class C, Non-Voting [Member]
Common stock, par value	$ 1	$ 1
Common stock, shares outstanding	9,406,392	9,406,267
Variable Interest Entity, Primary Beneficiary [Member]
Interest receivable - Consolidated Trusts amount	3,422	9,509
Accrued interest payable - Consolidated Trusts amount	$ 2,740	$ 5,145