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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, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans held for sale $ 0 $ 14
YTD Losses, Impaired Loans 1,581 12,291
YTD Losses, OREO 825 4,200
Loans held for sale 282,439 263,308
OREO 21,926 24,348
Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans held for sale 2,755 2,647
Impaired Loans 73,997 88,637
OREO 21,926 24,348
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans held for sale 0 0
Impaired Loans 0 0
OREO 0 0
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans held for sale 2,755 2,647
Impaired Loans 65,174 70,950
OREO 21,747 24,151
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans held for sale 0 0
Impaired Loans 8,823 17,687
OREO $ 179 $ 197