Other Investments (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
FHLB and FRB Stock
Investment in FRB and FHLB stock	$ 64,400,000	$ 90,000,000
Private Equity and Alternative Investments
Investments carried at cost	33,952,000	36,091,000
Recognized impairment losses on cost method investments	500,000	3,300,000	1,200,000
Alternative Investments Measured at Fair Value on a Nonrecurring Basis
Fair Value	895,000
Unfunded Commitments	179,000
Private equity and venture capital
Private Equity and Alternative Investments
Investments carried at cost	20,298,000	20,693,000
Private equity and venture capital | Fair Value | Nonrecurring
Alternative Investments Measured at Fair Value on a Nonrecurring Basis
Fair Value	662,000
Unfunded Commitments	179,000
Real estate
Private Equity and Alternative Investments
Investments carried at cost	7,646,000	9,223,000
Hedge
Private Equity and Alternative Investments
Investments carried at cost	2,733,000	2,866,000
Hedge | Fair Value | Nonrecurring
Alternative Investments Measured at Fair Value on a Nonrecurring Basis
Fair Value	233,000
Other
Private Equity and Alternative Investments
Investments carried at cost	$ 3,275,000	$ 3,309,000