Bank Loans (Risk Category Of Loan Portfolio) (Details) - USD ($) $ in Thousands	Jun. 30, 2015		Dec. 31, 2014		Jun. 30, 2014
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	$ 2,475,815		$ 2,116,634		$ 1,816,666
Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	2,468,391		2,105,155
Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio			6,631
Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	7,424		4,848
Commercial And Industrial [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	1,010,810		896,853		750,071
Commercial And Industrial [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	1,009,282		896,853
Commercial And Industrial [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	1,528
Consumer [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	983,359	[1]	758,288	[1]	624,700
Consumer [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	983,338		758,246
Consumer [Member] | Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio			28
Consumer [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	21		14
Residential Real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	448,994		432,646		411,439
Residential Real Estate [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	443,661		421,209
Residential Real Estate [Member] | Special Mention [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio			6,603
Residential Real Estate [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	5,333		4,834
Commercial Real Estate [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	20,053		15,902		16,055
Commercial Real Estate [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	19,834		15,902
Commercial Real Estate [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	219
Home Equity Lines Of Credit [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	12,599		12,945		$ 14,401
Home Equity Lines Of Credit [Member] | Pass [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	12,276		$ 12,945
Home Equity Lines Of Credit [Member] | Substandard [Member]
Financing Receivable Recorded Investment [Line Items]
Total risk category of loan portfolio	$ 323

[1] Includes securities-based loans of $ 963.1 million and $732.8 million at June 30, 2015 and December 31, 2014, respectively.