Short-Term And Long-Term Borrowings (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 510,900
Short-term borrowings	28,740
Long-term borrowings	$ 0	$ 0
Federal Home Loan Bank Advances [Member]
Line of Credit Facility [Line Items]
Debt interest rate	2.19%
Maximum [Member]
Line of Credit Facility [Line Items]
Federal Home Loan Bank advance period	60 months
Federal Home Loan Bank Advances [Member]
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	$ 150,000
Atlantic Community Bankers Bank Borrowings [Member]
Line of Credit Facility [Line Items]
Line of credit, maximum borrowing capacity	10,000
Line of credit outstanding	$ 0	$ 0