Loans (Risk Ratings) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 3,254,318	$ 3,263,399
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	100,944	98,785
Commercial And Industrial [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	99,912	97,684
Commercial And Industrial [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	634	667
Commercial And Industrial [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	398	434
Commercial And Industrial [Member] | Internal Investment Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	100,944	98,785
Residential Mortgages [Member] | Closed-end [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,777,332	1,809,651
Residential Mortgages [Member] | Revolving Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	66,049	67,710
Residential Mortgages [Member] | Pass [Member] | Closed-end [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,775,328	1,807,525
Residential Mortgages [Member] | Pass [Member] | Revolving Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	65,088	66,718
Residential Mortgages [Member] | Watch [Member] | Closed-end [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	312	312
Residential Mortgages [Member] | Special Mention [Member] | Revolving Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	247	249
Residential Mortgages [Member] | Substandard [Member] | Closed-end [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,692	1,814
Residential Mortgages [Member] | Substandard [Member] | Revolving Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	714	743
Residential Mortgages [Member] | Internal Investment Grade [Member] | Closed-end [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,777,332	1,809,651
Residential Mortgages [Member] | Internal Investment Grade [Member] | Revolving Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	66,049	67,710
Commercial Mortgages [Member] | Multifamily Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	781,835	756,714
Commercial Mortgages [Member] | Other Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	435,579	433,330
Commercial Mortgages [Member] | Owner-occupied Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	87,472	91,251
Commercial Mortgages [Member] | Pass [Member] | Multifamily Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	781,835	756,714
Commercial Mortgages [Member] | Pass [Member] | Other Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	435,579	417,838
Commercial Mortgages [Member] | Pass [Member] | Owner-occupied Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	82,097	85,710
Commercial Mortgages [Member] | Watch [Member] | Other Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		14,194
Commercial Mortgages [Member] | Watch [Member] | Owner-occupied Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,078	1,090
Commercial Mortgages [Member] | Special Mention [Member] | Other Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans		1,298
Commercial Mortgages [Member] | Special Mention [Member] | Owner-occupied Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	3,778	3,911
Commercial Mortgages [Member] | Substandard [Member] | Owner-occupied Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	519	540
Commercial Mortgages [Member] | Internal Investment Grade [Member] | Multifamily Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	781,835	756,714
Commercial Mortgages [Member] | Internal Investment Grade [Member] | Other Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	435,579	433,330
Commercial Mortgages [Member] | Internal Investment Grade [Member] | Owner-occupied Loan [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	87,472	91,251
Consumer And Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	5,107	5,958
Consumer And Other [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	4,307	4,958
Consumer And Other [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	296	324
Consumer And Other [Member] | Internal Investment Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	4,603	5,282
Residential Mortgages, Home Equity Lines, And Other Consumer Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,844,723	1,879,201
Residential Mortgages, Home Equity Lines, And Other Consumer Loans [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	312	312
Residential Mortgages, Home Equity Lines, And Other Consumer Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	247	249
Residential Mortgages, Home Equity Lines, And Other Consumer Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	2,702	2,881
Residential Mortgages, Home Equity Lines, And Other Consumer Loans [Member] | Internal Investment Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,847,984	1,882,643
Commercial And Industrial Loans And Commercial Real Estate Loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,399,423	1,357,946
Commercial And Industrial Loans And Commercial Real Estate Loans [Member] | Watch [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,078	15,284
Commercial And Industrial Loans And Commercial Real Estate Loans [Member] | Special Mention [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	4,412	5,876
Commercial And Industrial Loans And Commercial Real Estate Loans [Member] | Substandard [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	917	974
Commercial And Industrial Loans And Commercial Real Estate Loans [Member] | Internal Investment Grade [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 1,405,830	$ 1,380,080