CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Securities held-to-maturity
Securities held-to-maturity, fair value (in dollars)	$ 336,790	$ 318,748
Common stock
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized	60,000,000	60,000,000
Common stock, shares issued	37,995,085	37,941,007
Common stock, shares outstanding	37,995,085	37,941,007