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Fair Value Disclosures - Schedule of Financial Instruments Carried at Fair Value (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value $ 766,459 $ 721,029
Total assets measured at fair value on a recurring basis 766,459 721,029
Assets measured at fair value on a nonrecurring basis 2,935 5,080
Loans held-for sale 32,625 41,807
Impaired loans (collateral dependent),net 34,959 35,086
Total assets measured at fair value on a nonrecurring basis 70,519 81,973
GSE [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value 39,227 30,914
Other Real Estate Owned [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Assets measured at fair value on a nonrecurring basis 2,935 5,080
FNMA MBS [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value 347,224 318,471
FNMA MBS [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value 347,224 318,471
FHLMC MBS [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value 86,893 99,442
FHLMC MBS [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value 86,893 99,442
GNMA MBS [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value 26,793 20,714
GNMA MBS [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value 26,793  
GNMA MBA [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value   20,714
CMO [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value 266,322 251,488
CMO [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value 266,322 251,488
Significant Other Observable Inputs (Level 2) [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Total assets measured at fair value on a recurring basis 766,459 721,029
Loans held-for sale 32,625 41,807
Total assets measured at fair value on a nonrecurring basis 32,625 41,807
Significant Other Observable Inputs (Level 2) [Member] | GSE [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value 39,227 30,914
Significant Other Observable Inputs (Level 2) [Member] | FNMA MBS [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value 347,224 318,471
Significant Other Observable Inputs (Level 2) [Member] | FHLMC MBS [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value 86,893 99,442
Significant Other Observable Inputs (Level 2) [Member] | GNMA MBS [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value 26,793  
Significant Other Observable Inputs (Level 2) [Member] | GNMA MBA [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value   20,714
Significant Other Observable Inputs (Level 2) [Member] | CMO [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Fair Value 266,322 251,488
Significant Unobservable Inputs (Level 3) [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Impaired loans (collateral dependent),net 34,959 35,086
Total assets measured at fair value on a nonrecurring basis 37,894 40,166
Significant Unobservable Inputs (Level 3) [Member] | Other Real Estate Owned [Member]    
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Assets measured at fair value on a nonrecurring basis $ 2,935 $ 5,080