Deposits - Summary of Remaining Maturities or Re-pricing of Time Deposits (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Maturities of Time Deposits [Abstract]
Within one year	$ 383,497	$ 413,297
Over one year to two years	123,016	88,815
Over two years to three years	27,223	39,924
Over three years to five years	21,711	18,543
Time Deposits, Total	$ 555,447	$ 560,579
Within one year, Percent	69.00%	74.00%
Over one year to two years, Percent	22.00%	16.00%
Over two years to three years, Percent	5.00%	7.00%
Over three years to five years, Percent	4.00%	3.00%
Total, Percent	100.00%	100.00%