Other Comprehensive Income - Summary of Other Comprehensive Income and Tax Impact (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract]
Unrealized gain on available-for-sale securities, income tax expense	$ 228	$ 116	$ 19	$ 304
Unrealized loss on interest rate swaps, income tax benefit	$ 324	$ 225	$ 534	$ 358