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Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) - Fair Value, Measurements, Nonrecurring - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Certain impaired loans $ 41,636 [1] $ 45,837 [2]
Other assets 667 4,357 [3]
Total 42,303 50,194
Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Certain impaired loans 41,636 [1] 45,837 [2]
Other assets 667 4,357 [3]
Total $ 42,303 $ 50,194
[1] Represents the fair value of impaired loans based on the value of the collateral and repossessed assets, based on the appraised value of the collateral subsequent to its initial classification as repossessed assets.
[2] Represents the fair value of impaired loans, based on the value of the collateral.
[3] Represents the fair value of repossessed assets, based on the appraised value of the collateral subsequent to its initial classification as repossessed assets.