Loans (Aging Of The Recorded Investment In Loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	$ 1,797	$ 1,000
Total past due loan & nonaccrual loans	3,918	3,756
Current	3,250,691	2,946,596
Loans	3,254,609	2,950,352
Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due loan & nonaccrual loans	178	20
Current	103,312	109,603
Loans	103,490	109,623
Commercial Mortgages [Member] | Multifamily Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	744,623	682,593
Loans	744,623	682,593
Commercial Mortgages [Member] | Other Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	432,284	414,783
Loans	432,284	414,783
Commercial Mortgages [Member] | Owner-occupied Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	96,563	95,631
Loans	96,563	95,631
Residential Mortgages [Member] | Closed End Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual Loans	1,797	1,000
Total past due loan & nonaccrual loans	3,372	3,207
Current	1,788,841	1,555,357
Loans	1,792,213	1,558,564
Residential Mortgages [Member] | Revolving Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due loan & nonaccrual loans	362	522
Current	78,384	83,103
Loans	78,746	83,625
Consumer And Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due loan & nonaccrual loans	6	7
Current	6,684	5,526
Loans	6,690	5,533
30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,691	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 Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	1,575	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	110	522
30 to 59 Days Past Due [Member] | Consumer And Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	6	7
60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	430	21
60 to 89 Days Past Due [Member] | Commercial And Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	178
60 to 89 Days Past Due [Member] | Residential Mortgages [Member] | Closed End Loan [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due		$ 21
60 to 89 Days Past Due [Member] | Residential Mortgages [Member] | Revolving Home Equity [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past due	$ 252