Consolidated Balance Sheets [Parenthetical] - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Balance Sheet Parenthetical [Abstract]
Investment Securities held-to-maturity, estimated fair value (in dollars)	$ 142,272	$ 142,260
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	76,262,184	72,792,570
Common stock, shares outstanding (in shares)	76,262,184	72,792,570