Revenue Recognition - Summary of Noninterest Income Segregated By Revenue Streams In-scope and Out-of-scope of Topic 606 (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Noninterest income
Service charges	$ 1,726	$ 1,219	$ 4,733	$ 3,712
ATM/Interchange fees	1,014	622	2,871	1,764
Wealth management fees	975	873	2,733	2,561
Tax refund processing fees			2,750	2,750
Other	280	203	675	650
Noninterest Income (in-scope of Topic 606)	3,995	2,917	13,762	11,437
Noninterest Income (out-of-scope of Topic 606)	1,434	371	3,054	1,856
Total noninterest income	$ 5,429	$ 3,288	$ 16,816	$ 13,293