Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands, None in scaling factor is -9223372036854775296	Jun. 30, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Investment securities held to maturity; fair value	$ 123,585	$ 109,030
Common stock, par value
Common stock, shares authorized	70,000,000	70,000,000
Common stock, shares issued	37,903,282	37,910,840