Derivatives and Hedging Activities: Schedule of Fair Value of Derivative Financial Instruments by Balance Sheet Location (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Asset Derivative Fair Value
Location in Consolidated Statements of Financial Condition	Prepaid expenses and other assets
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	$ 1,200	$ 111
Total asset derivatives not designated as hedging instruments	1,200	111
Liability Derivative Fair Value
Location in Consolidated Statements of Financial Condition	Accrued expenses and other liabilities
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value	1,230	121
Total liability derivatives not designated as hedging instruments	$ 1,230	$ 121