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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 284,358 $ 324,500
Gross Unrealized Gains 3,388 5,023
Gross Unrealized Losses (3,118) (5,014)
Fair Value 284,628 324,509
U.S. Treasury [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 25,950 26,067
Gross Unrealized Losses (619) (795)
Fair Value 25,331 25,272
U.S. Government agency [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 148,096 174,772
Gross Unrealized Gains 911 1,386
Gross Unrealized Losses (1,861) (3,186)
Fair Value 147,146 172,972
Mortgage-backed securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 32,721 44,638
Gross Unrealized Gains 607 728
Gross Unrealized Losses (146) (574)
Fair Value 33,182 44,792
State and local governments [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 77,591 79,023
Gross Unrealized Gains 1,870 2,909
Gross Unrealized Losses (492) (459)
Fair Value $ 78,969 $ 81,473