Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Certain impaired loans	[1]	$ 30,512	$ 38,213
Other assets	[2]		1,265
Total		30,512	39,478
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Certain impaired loans	[1]	30,512	38,213
Other assets	[2]		1,265
Total		$ 30,512	$ 39,478

[1] Represents the fair value of impaired loans, based on the value of the collateral.

[2] Represents the fair value of repossessed assets, based on the appraised value of the collateral subsequent to its initial classification as repossessed assets.