Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Maturities of Time Deposits [Abstract]
Within one year	$ 394,674
After one but within two years	259,710
After two but within three years	62,536
After three but within four years	40,151
After four but within five years	28,525
After five years	21,170
Total	806,766	$ 872,411
Time Deposits, $250,000 or More [Abstract]
Time deposits of $250,000 or more	$ 92,800	$ 84,300