CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Fair value of held-to maturity securities	$ 13,146	$ 34,844
Preferred stock par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock authorized (in shares)	10,000,000	10,000,000
Preferred stock issued (in shares)	0	0
Preferred stock outstanding (in shares)	0	0
Common stock par value (in dollars per share)	$ 0.01	$ 0.01
Common stock authorized (in shares)	90,000,000	90,000,000
Common stock issued (in shares)	37,280,822	37,165,674
Common stock outstanding (in shares)	37,102,822	36,987,674
Treasury stock at cost (in shares)	178,000	178,000