CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Preferred stock, $0.01 par value, 10,000,000 shares authorized, no shares issued or outstanding	$ 0	$ 0
Held-to-maturity, fair value	$ 63,993	$ 13,146
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)	37,467,477	37,280,822
Common stock outstanding (in shares)	37,289,477	37,102,822
Treasury stock (in shares)	178,000	178,000