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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
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 308,739 $ 324,500
Gross Unrealized Gains 3,504 5,023
Gross Unrealized Losses (4,518) (5,014)
Estimated Market Value 307,725 324,509
U.S. Treasury [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 26,009 26,067
Gross Unrealized Gains      
Gross Unrealized Losses (780) (795)
Estimated Market Value 25,229 25,272
U.S. Government agency [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 161,535 174,772
Gross Unrealized Gains 1,098 1,386
Gross Unrealized Losses (2,767) (3,186)
Estimated Market Value 159,866 172,972
Mortgage-backed securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 42,478 44,638
Gross Unrealized Gains 661 728
Gross Unrealized Losses (324) (574)
Estimated Market Value 42,815 44,792
State and local governments [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 78,717 79,023
Gross Unrealized Gains 1,745 2,909
Gross Unrealized Losses (647) (459)
Estimated Market Value $ 79,815 $ 81,473