CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Interest receivable - Consolidated Trusts amount	$ 104,550	$ 107,201
Accrued interest payable - Consolidated Trusts amount	48,355	53,772
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	$ 0
Preferred stock, shares authorized	3,000,000	0
Preferred Stock, shares issued	3,000,000	0
Preferred Stock, shares outstanding	3,000,000	0
Series C Preferred Stock [Member]
Preferred stock, par value	$ 25	$ 0
Preferred stock, shares authorized	3,000,000	0
Preferred Stock, shares issued	3,000,000	0
Preferred Stock, shares outstanding	3,000,000	0
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	9,406,267	9,354,804
Variable Interest Entity, Primary Beneficiary [Member]
Interest receivable - Consolidated Trusts amount	9,509	9,276
Accrued interest payable - Consolidated Trusts amount	$ 5,145	$ 2,823