Securitized Mortage Loans, Net Securitized Mortgage Loans, Net (Details) (USD $)	3 Months Ended
	Mar. 31, 2013		Dec. 31, 2012
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement	$ 65,740,000	[1]	$ 71,913,000	[1]
Unamortized (discount) premium, net for securitized mortgage loans	(655,000)		(651,000)
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount	65,085,000		71,262,000
Allowance for Loan Losses	260,000		439,000
Securitized mortgage loans, net	64,825,000		70,823,000
Commercial Portfolio Segment [Member]
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement	27,010,000	[1]	30,576,000	[1]
Unamortized (discount) premium, net for securitized mortgage loans	(1,229,000)		(1,267,000)
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount	25,781,000		29,309,000
Allowance for Loan Losses	145,000		150,000
Securitized mortgage loans, net	25,636,000		29,159,000
Mortgage Loans on Real Estate, Collections of Principal	3,565,000
Loan-to-value ratio, Percentage	50.00%		48.00%
Mortgage Loans on Real Estate, Principal Amount of Delinquent Loans	0
Residential Portfolio Segment [Member]
Assets that Continue to be Recognized, Securitized or Asset-backed Financing Arrangement Assets and any Other Financial Assets Managed Together [Line Items]
Principal Amount Outstanding on Loans Securitized or Asset-backed Financing Arrangement	38,730,000		41,337,000
Unamortized (discount) premium, net for securitized mortgage loans	574,000		616,000
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount	39,304,000		41,953,000
Allowance for Loan Losses	115,000		289,000
Securitized mortgage loans, net	39,189,000		41,664,000
Mortgage Loans on Real Estate, Collections of Principal	2,172,000
Loan-to-value ratio, Percentage	42.00%		43.00%
Mortgage Loans on Real Estate, Principal Amount of Delinquent Loans	$ 4,171,000		$ 3,380,000

[1] Includes funds held by trustees.