Bank Loans (Changes in the Allowance for Loan Losses) (Details) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Mar. 31, 2011	Mar. 31, 2010
Allowance for loan losses, beginning of period			$ 2,331	$ 1,702	$ 3,251	$ 1,669
Provision for loan losses	559	(51)	1,465	216
Total charge-offs	0	(66)	0	(217)
Recoveries	20	4	34	122
Allowance for loan losses, end of period	3,830	1,823	3,830	1,823	3,251	1,669
Residential Real Estate [Member]
Total charge-offs	0	(66)	0	(215)
Other Loans [Member]
Allowance for Loan and Lease Losses, Write-offs, Other	$ 0	$ 0	$ 0	$ (2)