Loans (Risk Ratings) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 3,263,399	$ 2,950,352
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	98,785	109,623
Commercial And Industrial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	97,684	108,846
Commercial And Industrial [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		450
Commercial And Industrial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	667	279
Commercial And Industrial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	434	48
Commercial And Industrial [Member] | Internal Investment Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	98,785	109,623
Residential Mortgages [Member] | Closed-End [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,809,651	1,558,564
Residential Mortgages [Member] | Revolving Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	67,710	83,625
Residential Mortgages [Member] | Pass [Member] | Closed-End [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,807,525	1,554,168
Residential Mortgages [Member] | Pass [Member] | Revolving Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	66,718	82,665
Residential Mortgages [Member] | Watch [Member] | Closed-End [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	312	2,200
Residential Mortgages [Member] | Watch [Member] | Revolving Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		256
Residential Mortgages [Member] | Special Mention [Member] | Closed-End [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		828
Residential Mortgages [Member] | Special Mention [Member] | Revolving Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	249	704
Residential Mortgages [Member] | Substandard [Member] | Closed-End [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,814	1,368
Residential Mortgages [Member] | Substandard [Member] | Revolving Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	743
Residential Mortgages [Member] | Internal Investment Grade [Member] | Closed-End [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,809,651	1,558,564
Residential Mortgages [Member] | Internal Investment Grade [Member] | Revolving Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	67,710	83,625
Commercial Mortgages [Member] | Multifamily Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	756,714	682,593
Commercial Mortgages [Member] | Other Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	433,330	414,783
Commercial Mortgages [Member] | Owner-occupied Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	91,251	95,631
Commercial Mortgages [Member] | Pass [Member] | Multifamily Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	756,714	673,128
Commercial Mortgages [Member] | Pass [Member] | Other Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	417,838	404,379
Commercial Mortgages [Member] | Pass [Member] | Owner-occupied Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	85,710	93,618
Commercial Mortgages [Member] | Watch [Member] | Multifamily Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		2,354
Commercial Mortgages [Member] | Watch [Member] | Other Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	14,194	7,567
Commercial Mortgages [Member] | Watch [Member] | Owner-occupied Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,090
Commercial Mortgages [Member] | Special Mention [Member] | Multifamily Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		7,111
Commercial Mortgages [Member] | Special Mention [Member] | Other Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,298	2,837
Commercial Mortgages [Member] | Special Mention [Member] | Owner-occupied Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	3,911	1,482
Commercial Mortgages [Member] | Substandard [Member] | Owner-occupied Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	540	531
Commercial Mortgages [Member] | Internal Investment Grade [Member] | Multifamily Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	756,714	682,593
Commercial Mortgages [Member] | Internal Investment Grade [Member] | Other Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	433,330	414,783
Commercial Mortgages [Member] | Internal Investment Grade [Member] | Owner-occupied Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	91,251	95,631
Consumer And Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	5,958	5,533
Consumer And Other [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	4,958	5,236
Consumer And Other [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	324
Consumer And Other [Member] | Internal Investment Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	5,282	5,236
Residential Mortgages, Home Equity Lines, And Other Consumer Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,879,201	1,642,069
Residential Mortgages, Home Equity Lines, And Other Consumer Loans [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	312	2,456
Residential Mortgages, Home Equity Lines, And Other Consumer Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	249	1,532
Residential Mortgages, Home Equity Lines, And Other Consumer Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,881	1,368
Residential Mortgages, Home Equity Lines, And Other Consumer Loans [Member] | Internal Investment Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,882,643	1,647,425
Commercial And Industrial Loans And Commercial Real Estate Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,357,946	1,279,971
Commercial And Industrial Loans And Commercial Real Estate Loans [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	15,284	10,371
Commercial And Industrial Loans And Commercial Real Estate Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	5,876	11,709
Commercial And Industrial Loans And Commercial Real Estate Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	974	579
Commercial And Industrial Loans And Commercial Real Estate Loans [Member] | Internal Investment Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 1,380,080	$ 1,302,630