Loans (Aging Of The Recorded Investment In Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	$ 2,135	$ 1,000
Total past due loan & nonaccrual loans	3,044	3,756
Current	3,260,355	2,946,596
Loans	3,263,399	2,950,352
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due loan & nonaccrual loans	43	20
Current	98,742	109,603
Loans	98,785	109,623
Commercial Mortgages [Member] | Multifamily Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	756,714	682,593
Loans	756,714	682,593
Commercial Mortgages [Member] | Other Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	433,330	414,783
Loans	433,330	414,783
Commercial Mortgages [Member] | Owner-occupied Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	91,251	95,631
Loans	91,251	95,631
Residential Mortgages [Member] | Closed-End [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	1,392	1,000
Total past due loan & nonaccrual loans	2,256	3,207
Current	1,807,395	1,555,357
Loans	1,809,651	1,558,564
Residential Mortgages [Member] | Revolving Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	743
Total past due loan & nonaccrual loans	743	522
Current	66,967	83,103
Loans	67,710	83,625
Consumer And Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due loan & nonaccrual loans	2	7
Current	5,956	5,526
Loans	5,958	5,533
30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	866	2,735
30 to 59 Days Past Due [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		20
30 to 59 Days Past Due [Member] | Residential Mortgages [Member] | Closed-End [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	864	2,186
30 to 59 Days Past Due [Member] | Residential Mortgages [Member] | Revolving Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		522
30 to 59 Days Past Due [Member] | Consumer And Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	2	7
60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	43	21
60 to 89 Days Past Due [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	$ 43
60 to 89 Days Past Due [Member] | Residential Mortgages [Member] | Closed-End [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		$ 21