Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Securities Held-to-Maturity, Fair Value	$ 37,031	$ 41,061
Accumulated amortization and fair value adjustments on other intangibles	$ 14,349	$ 15,360
Common stock, par value	$ 5	$ 5
Common stock, shares authorized	48,000,000	48,000,000
Common stock, shares issued	22,054,270	22,054,270
Common stock, shares outstanding	19,592,798	19,530,930
Treasury stock, shares	2,461,472	2,523,340