Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Detail) - Nonrecurring - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets
Impaired loans	$ 87,227	$ 74,763
OREO, net	6,869	4,907
Total	94,096	79,670
Level 1
Assets
Impaired loans	0	0
OREO, net	0	0
Total	0	0
Level 2
Assets
Impaired loans	0	0
OREO, net	0	0
Total	0	0
Level 3
Assets
Impaired loans	87,227	74,763
OREO, net	6,869	4,907
Total	$ 94,096	$ 79,670