Deposits - Summary of Remaining Time to Maturity for Time Deposits (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Certificates of deposit (not jumbo):
Less than one year	$ 228,045	$ 167,757
One year to two years	94,488	103,192
Two years to three years	14,441	46,827
Three years to four years	4,048	5,962
Over four years	5,927	6,399
Total certificates of deposit (not jumbo)	346,949	330,137
Jumbo certificates of deposit
Less than one year	223,798	166,348
One year to two years	91,486	94,905
Two years to three years	5,957	30,400
Three years to four years	2,399	3,512
Over four years	2,353	3,769
Total jumbo certificates of deposit	325,993	298,934
Total customer deposits	$ 672,942	$ 629,071