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Securities - Gross Unrealized Losses and Fair Value of Company's Investments (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months $ 56,088 $ 241,541
Fair value more than 12 months 101,074 11,807
Total fair value 157,162 253,348
Unrealized losses less than 12 months (383) (8,205)
Unrealized losses more than 12 months (2,750) (646)
Total unrealized losses (3,133) (8,851)
U.S. Treasury and Federal Agencies [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 3,956 32,099
Fair value more than 12 months 23,648   
Total fair value 27,604 32,099
Unrealized losses less than 12 months (4) (807)
Unrealized losses more than 12 months (335)   
Total unrealized losses (339) (807)
State and Municipal [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 6,200 57,078
Fair value more than 12 months 2,674 3,206
Total fair value 8,874 60,284
Unrealized losses less than 12 months (35) (2,993)
Unrealized losses more than 12 months (39) (184)
Total unrealized losses (74) (3,177)
Federal Agency Collateralized Mortgage Obligations [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 37,987 64,445
Fair value more than 12 months 40,882 8,601
Total fair value 78,869 73,046
Unrealized losses less than 12 months (318) (2,121)
Unrealized losses more than 12 months (1,440) (462)
Total unrealized losses (1,758) (2,583)
Federal Agency Mortgage-backed Pools [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value less than 12 months 7,945 87,919
Fair value more than 12 months 33,870   
Total fair value 41,815 87,919
Unrealized losses less than 12 months (26) (2,284)
Unrealized losses more than 12 months (936)   
Total unrealized losses $ (962) $ (2,284)