Loans (Risk Ratings) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 3,197,134	$ 3,263,399
Commercial And Industrial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	105,426	98,785
Commercial And Industrial [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	104,531	97,684
Commercial And Industrial [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	500	667
Commercial And Industrial [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	395	434
Commercial And Industrial [Member] | Internal Investment Grade [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	105,426	98,785
Residential Mortgages [Member] | Closed-end [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,674,539	1,809,651
Residential Mortgages [Member] | Revolving Home Equity [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	62,875	67,710
Residential Mortgages [Member] | Pass [Member] | Closed-end [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,671,967	1,807,525
Residential Mortgages [Member] | Pass [Member] | Revolving Home Equity [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	62,220	66,718
Residential Mortgages [Member] | Watch [Member] | Closed-end [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	308	312
Residential Mortgages [Member] | Watch [Member] | Revolving Home Equity [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	416
Residential Mortgages [Member] | Special Mention [Member] | Closed-end [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	896
Residential Mortgages [Member] | Special Mention [Member] | Revolving Home Equity [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	239	249
Residential Mortgages [Member] | Substandard [Member] | Closed-end [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,368	1,814
Residential Mortgages [Member] | Substandard [Member] | Revolving Home Equity [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		743
Residential Mortgages [Member] | Internal Investment Grade [Member] | Closed-end [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,674,539	1,809,651
Residential Mortgages [Member] | Internal Investment Grade [Member] | Revolving Home Equity [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	62,875	67,710
Commercial Mortgages [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,351,918	1,281,295
Commercial Mortgages [Member] | Multifamily Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	798,289	756,714
Commercial Mortgages [Member] | Other Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	435,105	433,330
Commercial Mortgages [Member] | Owner-occupied Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	118,524	91,251
Commercial Mortgages [Member] | Pass [Member] | Multifamily Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	795,953	756,714
Commercial Mortgages [Member] | Pass [Member] | Other Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	435,105	417,838
Commercial Mortgages [Member] | Pass [Member] | Owner-occupied Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	113,458	85,710
Commercial Mortgages [Member] | Watch [Member] | Other Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		14,194
Commercial Mortgages [Member] | Watch [Member] | Owner-occupied Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,053	1,090
Commercial Mortgages [Member] | Special Mention [Member] | Multifamily Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	2,336
Commercial Mortgages [Member] | Special Mention [Member] | Other Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans		1,298
Commercial Mortgages [Member] | Special Mention [Member] | Owner-occupied Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	3,507	3,911
Commercial Mortgages [Member] | Substandard [Member] | Owner-occupied Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	506	540
Commercial Mortgages [Member] | Internal Investment Grade [Member] | Multifamily Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	798,289	756,714
Commercial Mortgages [Member] | Internal Investment Grade [Member] | Other Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	435,105	433,330
Commercial Mortgages [Member] | Internal Investment Grade [Member] | Owner-occupied Loan [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	118,524	91,251
Consumer And Other [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	2,376	5,958
Consumer And Other [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,091	4,958
Consumer And Other [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	278	324
Consumer And Other [Member] | Internal Investment Grade [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,369	5,282
Residential Mortgages, Home Equity Lines, And Other Consumer Loans [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,735,278	1,879,201
Residential Mortgages, Home Equity Lines, And Other Consumer Loans [Member] | Watch [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	724	312
Residential Mortgages, Home Equity Lines, And Other Consumer Loans [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,135	249
Residential Mortgages, Home Equity Lines, And Other Consumer Loans [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,646	2,881
Residential Mortgages, Home Equity Lines, And Other Consumer Loans [Member] | Internal Investment Grade [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,738,783	1,882,643
Commercial And Industrial Loans And Commercial Real Estate Loans [Member] | Pass [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,449,047	1,357,946
Commercial And Industrial Loans And Commercial Real Estate Loans [Member] | Watch [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	1,053	15,284
Commercial And Industrial Loans And Commercial Real Estate Loans [Member] | Special Mention [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	6,343	5,876
Commercial And Industrial Loans And Commercial Real Estate Loans [Member] | Substandard [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	901	974
Commercial And Industrial Loans And Commercial Real Estate Loans [Member] | Internal Investment Grade [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Loans	$ 1,457,344	$ 1,380,080