Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Investment securities held to maturity; fair value	$ 96,196	$ 99,784
Common stock, par value
Common stock, shares authorized	70,000,000	70,000,000
Common stock, shares issued	35,823,147	29,941,967
Treasury stock, shares	0	216,077