Investments (Details Textual) (USD $)	3 Months Ended			9 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Available For Sale Securities Pledged As Collateral Amortized Cost	$ 294,600,000			$ 294,600,000
Proceeds from Sale of Available-for-sale Securities	0			465,608,000	12,810,000
Gain (Loss) on Sale of Investments			5,200,000	4,900,000	409,000
Sales of available-for-sale securities during the period				461,700,000
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	700,000	13,296,000	(669,000)	24,168,000	(32,573,000)
Federal Home Loan Bank stock, at cost	45,602,000			45,602,000		27,939,000
Federal Home Loan Bank of San Francisco [Member]
Schedule of Available-for-sale Securities [Line Items]
Increase (Decrease) in Marketable Securities, Restricted				17,700,000
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Sales of available-for-sale securities during the period					12,400,000
Government agency and government-sponsored enterprise pass through securities
Schedule of Available-for-sale Securities [Line Items]
Proceeds from Sale of Available-for-sale Securities			$ 0