Merger With Madison Bancorp, Inc. (Summary Of Assets Acquired And Liabilities Assumed Recorded At Estimated Fair Value) (Details) - USD ($) $ in Thousands	Jan. 16, 2015	Sep. 30, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Net goodwill resulting from merger		$ 2,301	$ 2,301
Madison Bancorp, Inc. [Member]
Business Acquisition [Line Items]
Cash paid for outstanding shares of Madison common stock and outstanding options	$ 14,425
Cash and due from banks	35,516
Securities, available for sale	1,396
Loans	77,228
Premises and equipment	2,601
Other assets	17,567
Total assets acquired	134,308
Deposits	120,545
Other liabilities	1,639
Total liabilities assumed	122,184
Net goodwill resulting from merger	$ 2,301