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Fair Value Disclosures of Financial Assets and Liabilities - Schedule of Financial Instruments Carried at Fair Value (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale securities $ 1,205,079 $ 837,499
Loans held for sale 25,318 31,055
Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets measured at fair value 1,207,177 838,869
Other liabilities 3,493 3,225
Fair Value, Measurements, Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held for sale 25,318 31,055
Impaired loans, net 47,094 57,089
Total assets measured at fair value 112,313 90,647
Other assets | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other assets 2,098 747
Other real estate owned | Fair Value, Measurements, Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other real estate owned 2,668 2,503
CMO    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale securities 371,750 246,539
CMO | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale securities 371,750 246,539
FNMA MBS    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale securities 644,073 473,987
FNMA MBS | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale securities 644,073 473,987
FHLMC MBS    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale securities 153,922 87,875
FHLMC MBS | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale securities 153,922 87,875
GNMA MBS    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale securities 35,334 29,098
GNMA MBS | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale securities 35,334 29,098
Other investments | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets measured at fair value   623
Other investments | Fair Value, Measurements, Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets measured at fair value 37,233  
Quoted Prices in Active Markets for Identical Asset (Level 1) | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets measured at fair value 0 623
Other liabilities 0 0
Quoted Prices in Active Markets for Identical Asset (Level 1) | Fair Value, Measurements, Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held for sale 0 0
Impaired loans, net 0 0
Total assets measured at fair value 0 0
Quoted Prices in Active Markets for Identical Asset (Level 1) | Other assets | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other assets 0 0
Quoted Prices in Active Markets for Identical Asset (Level 1) | Other real estate owned | Fair Value, Measurements, Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other real estate owned 0 0
Quoted Prices in Active Markets for Identical Asset (Level 1) | CMO | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale securities 0 0
Quoted Prices in Active Markets for Identical Asset (Level 1) | FNMA MBS | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale securities 0 0
Quoted Prices in Active Markets for Identical Asset (Level 1) | FHLMC MBS | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale securities 0 0
Quoted Prices in Active Markets for Identical Asset (Level 1) | GNMA MBS | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale securities 0 0
Quoted Prices in Active Markets for Identical Asset (Level 1) | Other investments | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets measured at fair value   623
Quoted Prices in Active Markets for Identical Asset (Level 1) | Other investments | Fair Value, Measurements, Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets measured at fair value 0  
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets measured at fair value 1,207,177 838,246
Other liabilities 3,493 3,225
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held for sale 25,318 31,055
Impaired loans, net 0 0
Total assets measured at fair value 25,318 31,055
Significant Other Observable Inputs (Level 2) | Other assets | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other assets 2,098 747
Significant Other Observable Inputs (Level 2) | Other real estate owned | Fair Value, Measurements, Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other real estate owned 0 0
Significant Other Observable Inputs (Level 2) | CMO | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale securities 371,750 246,539
Significant Other Observable Inputs (Level 2) | FNMA MBS | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale securities 644,073 473,987
Significant Other Observable Inputs (Level 2) | FHLMC MBS | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale securities 153,922 87,875
Significant Other Observable Inputs (Level 2) | GNMA MBS | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale securities 35,334 29,098
Significant Other Observable Inputs (Level 2) | Other investments | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets measured at fair value   0
Significant Other Observable Inputs (Level 2) | Other investments | Fair Value, Measurements, Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets measured at fair value 0  
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets measured at fair value 0 0
Other liabilities 0 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans held for sale 0 0
Impaired loans, net 47,094 57,089
Total assets measured at fair value 86,995 59,592
Significant Unobservable Inputs (Level 3) | Other assets | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other assets 0 0
Significant Unobservable Inputs (Level 3) | Other real estate owned | Fair Value, Measurements, Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other real estate owned 2,668 2,503
Significant Unobservable Inputs (Level 3) | CMO | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale securities 0 0
Significant Unobservable Inputs (Level 3) | FNMA MBS | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale securities 0 0
Significant Unobservable Inputs (Level 3) | FHLMC MBS | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale securities 0 0
Significant Unobservable Inputs (Level 3) | GNMA MBS | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale securities 0 0
Significant Unobservable Inputs (Level 3) | Other investments | Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets measured at fair value   $ 0
Significant Unobservable Inputs (Level 3) | Other investments | Fair Value, Measurements, Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Total assets measured at fair value $ 37,233