Bank Loans (Changes In The Allowance For Loan Losses) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of period	$ 12,668	$ 8,145	$ 5,300
Provision for loan losses	8,531	8,842	3,004
Total charge-offs	(531)	(4,372)	(254)
Recoveries	63	53	95
Allowance for loan losses, end of period	20,731	12,668	8,145
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Charge-offs		(501)	(254)
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Charge-offs	(510)	(3,864)
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Charge-offs	(16)
Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Charge-offs	$ (5)	$ (7)