Deposits - Summary of Remaining Maturities or Re-pricing of Time Deposits (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Maturities of Time Deposits [Abstract]
Within one year	$ 262,406	$ 315,559
Over one year to two years	87,952	44,838
Over two years to three years	83,067	49,538
Over three years to five years	44,934	63,491
Time Deposits, Total	$ 478,359	$ 473,426
Within one year, Percent	55.00%	67.00%
Over one year to two years, Percent	18.00%	9.00%
Over two years to three years, Percent	17.00%	10.00%
Over three years to five years, Percent	10.00%	14.00%
Total, Percent	100.00%	100.00%