Bank Loans (Changes In The Allowance For Loan Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, beginning of period	$ 20,731	$ 12,668
Provision for loan losses	1,846	1,910
Total charge-offs	(47)	(472)
Recoveries	37	25
Allowance for loan losses, end of period	22,567	14,131
Construction And Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total charge-offs	(47)	(468)
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total charge-offs
Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total charge-offs		$ (4)