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Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) - Fair Value, Measurements, Nonrecurring - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Certain impaired loans [1] $ 15,558 $ 45,837
Other assets 3,121 [2] 4,357 [3]
Total 18,679 50,194
Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Certain impaired loans [1] 15,558 45,837
Other assets 3,121 [2] 4,357 [3]
Total $ 18,679 $ 50,194
[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.
[3] Represents the fair value of repossessed assets based on the appraised value of the collateral subsequent to its initial classification as repossessed assets.