Consolidated Statements of Condition (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Sep. 30, 2014
Statement of Financial Position [Abstract]
Securities held to maturity, fair value	$ 74,069	$ 73,057	$ 74,338
Allowance for loan losses	$ 14,762	$ 15,172	$ 15,421
Preferred Stock, Par value	$ 2.50	$ 2.50	$ 2.50
Preferred Stock, Shares authorized	20,000,000	20,000,000	20,000,000
Preferred Stock, Shares outstanding	0	0	0
Common Stock, Par value	$ 2.50	$ 2.50	$ 2.50
Common Stock, Shares authorized	20,000,000	20,000,000	20,000,000
Common Stock, Shares issued	6,097,235	6,078,250	6,073,929
Common Stock, Shares outstanding	6,034,635	6,015,650	6,011,329
Treasury Stock, Shares	62,600	62,600	62,600