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Fair Value Measurements (Assets and Liabilities) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Securities available for sale:    
Securities available for sale, at fair value $ 1,028,305 $ 1,040,386
Derivative liabilities 2,500  
Measured on a non-recurring basis:    
Foreclosed assets 5,703 7,991
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 34,627 65,745
Derivative assets 0 0
Derivative liabilities 0 0
Significant Other Observable Inputs (Level 2) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 993,678 974,641
Derivative assets 8,035 7,441
Derivative liabilities 7,595 6,750
Significant Unobservable Inputs (Level 3) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 0 0
Derivative assets 0 0
Derivative liabilities 0 0
U.S. Treasury Obligations [Member]    
Securities available for sale:    
Securities available for sale, at fair value 5,994 8,008
U.S. Treasury Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 5,994 8,008
U.S. Treasury Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 0 0
U.S. Treasury Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 0 0
Agency Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 28,035 57,188
Agency Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 0 0
Agency Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 0 0
Mortgage-Backed Securities [Member]    
Securities available for sale:    
Securities available for sale, at fair value 968,412 951,861
Mortgage-Backed Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 0 0
Mortgage-Backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 968,412 951,861
Mortgage-Backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 0 0
State And Municipal Obligations [Member]    
Securities available for sale:    
Securities available for sale, at fair value 3,807 3,743
State And Municipal Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 0 0
State And Municipal Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 3,807 3,743
State And Municipal Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 0 0
Corporate Obligations [Member]    
Securities available for sale:    
Securities available for sale, at fair value 21,459 19,037
Corporate Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 0 0
Corporate Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 21,459 19,037
Corporate Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 0 0
Equity Securities [Member]    
Securities available for sale:    
Securities available for sale, at fair value 598 549
Equity Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 598 549
Equity Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 0 0
Equity Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 0 0
Measured on a Recurring Basis [Member]    
Securities available for sale:    
Securities available for sale, at fair value 1,028,305 1,040,386
Derivative assets 8,035 7,441
Total assets at fair value 1,036,340 1,047,827
Derivative liabilities 7,595 6,750
Measured on a Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 34,627 65,745
Derivative assets 0 0
Total assets at fair value 34,627 65,745
Derivative liabilities 0 0
Measured on a Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 993,678 974,641
Derivative assets 8,035 7,441
Total assets at fair value 1,001,713 982,082
Derivative liabilities 7,595 6,750
Measured on a Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 0 0
Derivative assets 0 0
Total assets at fair value 0 0
Derivative liabilities 0 0
Measured on a Recurring Basis [Member] | U.S. Treasury Obligations [Member]    
Securities available for sale:    
Securities available for sale, at fair value 5,994 8,008
Measured on a Recurring Basis [Member] | U.S. Treasury Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 5,994 8,008
Measured on a Recurring Basis [Member] | U.S. Treasury Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 0 0
Measured on a Recurring Basis [Member] | U.S. Treasury Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 0 0
Measured on a Recurring Basis [Member] | Agency Obligations [Member]    
Securities available for sale:    
Securities available for sale, at fair value 28,035 57,188
Measured on a Recurring Basis [Member] | Agency Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 28,035 57,188
Measured on a Recurring Basis [Member] | Agency Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 0 0
Measured on a Recurring Basis [Member] | Agency Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 0 0
Measured on a Recurring Basis [Member] | Mortgage-Backed Securities [Member]    
Securities available for sale:    
Securities available for sale, at fair value 968,412 951,861
Measured on a Recurring Basis [Member] | Mortgage-Backed Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 0 0
Measured on a Recurring Basis [Member] | Mortgage-Backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 968,412 951,861
Measured on a Recurring Basis [Member] | Mortgage-Backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 0 0
Measured on a Recurring Basis [Member] | State And Municipal Obligations [Member]    
Securities available for sale:    
Securities available for sale, at fair value 3,807 3,743
Measured on a Recurring Basis [Member] | State And Municipal Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 0 0
Measured on a Recurring Basis [Member] | State And Municipal Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 3,807 3,743
Measured on a Recurring Basis [Member] | State And Municipal Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 0 0
Measured on a Recurring Basis [Member] | Corporate Obligations [Member]    
Securities available for sale:    
Securities available for sale, at fair value 21,459 19,037
Measured on a Recurring Basis [Member] | Corporate Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 0 0
Measured on a Recurring Basis [Member] | Corporate Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 21,459 19,037
Measured on a Recurring Basis [Member] | Corporate Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 0 0
Measured on a Recurring Basis [Member] | Equity Securities [Member]    
Securities available for sale:    
Securities available for sale, at fair value 598 549
Measured on a Recurring Basis [Member] | Equity Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 598 549
Measured on a Recurring Basis [Member] | Equity Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 0 0
Measured on a Recurring Basis [Member] | Equity Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Securities available for sale:    
Securities available for sale, at fair value 0 0
Measured on a Non-Recurring Basis [Member]    
Measured on a non-recurring basis:    
Loans measured for impairment based on the fair value of the underlying collateral 5,525 11,001
Foreclosed assets 5,703 7,991
Fair value, Measured on a non-recurring basis 11,228 18,992
Measured on a Non-Recurring Basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Measured on a non-recurring basis:    
Loans measured for impairment based on the fair value of the underlying collateral 0 0
Foreclosed assets 0 0
Fair value, Measured on a non-recurring basis 0 0
Measured on a Non-Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Measured on a non-recurring basis:    
Loans measured for impairment based on the fair value of the underlying collateral 0 0
Foreclosed assets 0 0
Fair value, Measured on a non-recurring basis 0 0
Measured on a Non-Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Measured on a non-recurring basis:    
Loans measured for impairment based on the fair value of the underlying collateral 5,525 11,001
Foreclosed assets 5,703 7,991
Fair value, Measured on a non-recurring basis $ 11,228 $ 18,992