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Fair Value Measurements - Summary of Financial Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
YTD Losses, Loans held for sale $ (4) $ (3)
YTD Losses, Impaired Loans 4,781 (12,301)
YTD Losses, OREO (340) (910)
Loans held for sale 365,440 247,104
Impaired Loans 76,577 121,355
OREO 14,469 16,865
Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans held for sale 0 0
Impaired Loans 0 0
OREO 0 0
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans held for sale 5,153 2,742
Impaired Loans 65,604 108,899
OREO 14,391 16,865
Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans held for sale 0 0
Impaired Loans 10,973 12,456
OREO $ 78 $ 0