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Summary of Carrying Values, Estimated Fair Values and Fair Value Measurement Levels of Financial Instruments (Detail) - Fair Value, Measurements, Nonrecurring - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Certain impaired loans [1] $ 42,767 $ 38,213
Other assets [2] 1,481 1,265
Total 44,248 39,478
Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Certain impaired loans [1] 42,767 38,213
Other assets [2] 1,481 1,265
Total $ 44,248 $ 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.