Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Securities Held-to-Maturity, Fair Value	$ 41,323	$ 54,765
Accumulated amortization and fair value adjustments on other intangibles	$ 14,484	$ 11,776
Common stock, par value	$ 5	$ 5
Common stock, shares authorized	48,000,000	48,000,000
Common stock, shares issued	22,054,270	18,266,404
Common stock, shares outstanding	19,502,613	16,221,607
Treasury stock, shares	2,551,657	2,044,797