Loans (Allowance For Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses, beginning balance	$ 29,289	$ 30,838
Chargeoffs	619	188
Recoveries	189	6
Provision (Credit) for Credit Losses (Credit)	2,358	(457)
Allowance for credit losses, ending balance	34,105	30,199
Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses, beginning balance	1,493	1,158
Chargeoffs	618	54
Recoveries	187	4
Provision (Credit) for Credit Losses (Credit)	1,113	(61)
Allowance for credit losses, ending balance	1,931	1,047
Commercial Mortgages [Member] | Multifamily Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses, beginning balance	7,151	5,851
Provision (Credit) for Credit Losses (Credit)	437	584
Allowance for credit losses, ending balance	8,647	6,435
Commercial Mortgages [Member] | Other Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses, beginning balance	3,498	3,783
Provision (Credit) for Credit Losses (Credit)	341	(266)
Allowance for credit losses, ending balance	3,792	3,517
Commercial Mortgages [Member] | Owner-occupied Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses, beginning balance	921	743
Provision (Credit) for Credit Losses (Credit)	83	(58)
Allowance for credit losses, ending balance	1,782	685
Residential Mortgages [Member] | Closed-end [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses, beginning balance	15,698	18,844
Chargeoffs		134
Recoveries		1
Provision (Credit) for Credit Losses (Credit)	405	(640)
Allowance for credit losses, ending balance	17,459	18,071
Residential Mortgages [Member] | Revolving Home Equity [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses, beginning balance	515	410
Provision (Credit) for Credit Losses (Credit)	(22)	(8)
Allowance for credit losses, ending balance	487	402
Consumer And Other [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses, beginning balance	13	49
Chargeoffs	1
Recoveries	2	1
Provision (Credit) for Credit Losses (Credit)	1	(8)
Allowance for credit losses, ending balance	7	$ 42
As Reported Under ASC 326 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses, beginning balance	32,177
As Reported Under ASC 326 [Member] | Commercial And Industrial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses, beginning balance	1,249
As Reported Under ASC 326 [Member] | Commercial Mortgages [Member] | Multifamily Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses, beginning balance	8,210
As Reported Under ASC 326 [Member] | Commercial Mortgages [Member] | Other Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses, beginning balance	3,451
As Reported Under ASC 326 [Member] | Commercial Mortgages [Member] | Owner-occupied Loan [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses, beginning balance	1,699
As Reported Under ASC 326 [Member] | Residential Mortgages [Member] | Closed-end [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses, beginning balance	17,054
As Reported Under ASC 326 [Member] | Residential Mortgages [Member] | Revolving Home Equity [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses, beginning balance	509
As Reported Under ASC 326 [Member] | Consumer And Other [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Allowance for credit losses, beginning balance	$ 5