Fair Value Of Assets And Liabilities (Summary Of Differences Between The Fair Value Carrying Amount Of Mortgages Held-For-Sale And Aggregate Unpaid Principal Amount) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans held-for-sale	$ 21,209	$ 20,881
Fair value carrying amount less aggregate unpaid principal - Total loans	(8,322)	(8,874)
Nonaccrual loans	5,300	5,783
Fair value carrying amount less aggregate unpaid principal - Nonaccrual loans	(4,660)	(5,098)
Loans 90 days or more past due and still accruing	99	0
Fair value carrying amount less aggregate unpaid principal - Loans 90 days or more past due and still accruing	(25)	0
Aggregate unpaid principal
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans held-for-sale	29,531	29,755
Nonaccrual loans	9,960	10,881
Loans 90 days or more past due and still accruing	$ 124	$ 0