Other Comprehensive Income - Summary of Changes in Component of AOCI (Detail) - USD ($) $ in Thousands		3 Months Ended								6 Months Ended
		Jun. 30, 2020		Mar. 31, 2020		Jun. 30, 2019		Mar. 31, 2019		Jun. 30, 2020	Jun. 30, 2019
Balance at the beginning of the period	[1]	$ 726		$ 521		$ 78		$ (465)		$ 521	$ (465)
Other comprehensive income (loss) before reclassification	[1]	312		253		332		518
Amounts reclassified from AOCI	[1]	(44)		(48)		12		25
Other comprehensive income		268	[1]	205	[1]	344	[1]	543	[1]	473	887
Balance at the end of the period	[1]	994		726		422		78		994	422
Net Unrealized Gains (Losses) on AFS Securities [Member]
Balance at the beginning of the period	[1]	726		521		78		(465)		521	(465)
Other comprehensive income (loss) before reclassification	[1]	436		253		332		518
Amounts reclassified from AOCI	[1]	(49)		(48)		12		25
Other comprehensive income	[1]	387		205		344		543
Balance at the end of the period	[1]	1,113		$ 726		$ 422		$ 78		1,113	$ 422
Net Unrealized Losses on Cash Flow Hedges [Member]
Other comprehensive income (loss) before reclassification	[1]	(124)
Amounts reclassified from AOCI	[1]	5
Other comprehensive income	[1]	(119)
Balance at the end of the period	[1]	$ (119)								$ (119)

[1] All amounts are net of tax