Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value (Detail) - Recurring - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
ASSETS
Total assets	$ 11,122
Securities (Assets)
ASSETS
Total assets	6,606	$ 6,024
Interest Rate Swap
ASSETS
Total assets	4,516
Liabilities:
Total liabilities		667
Level 1
ASSETS
Total assets	6,606
Level 1 | Securities (Assets)
ASSETS
Total assets	6,606	6,024
Level 1 | Interest Rate Swap
ASSETS
Total assets	0
Liabilities:
Total liabilities		0
Level 2
ASSETS
Total assets	4,516
Level 2 | Securities (Assets)
ASSETS
Total assets	0	0
Level 2 | Interest Rate Swap
ASSETS
Total assets	4,516
Liabilities:
Total liabilities		667
Level 3
ASSETS
Total assets	0
Level 3 | Securities (Assets)
ASSETS
Total assets	0	0
Level 3 | Interest Rate Swap
ASSETS
Total assets	$ 0
Liabilities:
Total liabilities		$ 0