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Securities - Securities with Unrealized Losses Aggregated by Investment Category and Length of Time that Individual Securities have been in Continuous Unrealized Loss Position (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value $ 341,633 $ 85,252
Less than 12 Months, Unrealized Loss (16,734) (923)
12 Months or More, Fair Value 58,496 17,856
12 Months or More, Unrealized Loss (4,840) (2,584)
Total, Fair Value 400,129 103,108
Total, Unrealized Loss (21,574) (3,507)
U.S. Treasury [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 0 0
Less than 12 Months, Unrealized Loss 0 0
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Loss 0 0
Total, Fair Value 0 0
Total, Unrealized Loss 0 0
U.S. Government Sponsored Entities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 95,677 41,715
Less than 12 Months, Unrealized Loss (5,394) (161)
12 Months or More, Fair Value 17,964 0
12 Months or More, Unrealized Loss (1,080) 0
Total, Fair Value 113,641 41,715
Total, Unrealized Loss (6,474) (161)
States and Political Subdivisions [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 57,526 7,857
Less than 12 Months, Unrealized Loss (2,192) (57)
12 Months or More, Fair Value 5,324 0
12 Months or More, Unrealized Loss (125) 0
Total, Fair Value 62,850 7,857
Total, Unrealized Loss (2,317) (57)
Residential and Multi-Family Mortgage [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 150,229 32,159
Less than 12 Months, Unrealized Loss (6,806) (688)
12 Months or More, Fair Value 16,608 4,254
12 Months or More, Unrealized Loss (1,014) (14)
Total, Fair Value 166,837 36,413
Total, Unrealized Loss (7,820) (702)
Commercial Mortgage [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 374 0
Less than 12 Months, Unrealized Loss (11) 0
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Loss 0 0
Total, Fair Value 374 0
Total, Unrealized Loss (11) 0
Corporate Notes and Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 0 0
Less than 12 Months, Unrealized Loss 0 0
12 Months or More, Fair Value 9,662 13,002
12 Months or More, Unrealized Loss (1,734) (2,370)
Total, Fair Value 9,662 13,002
Total, Unrealized Loss (1,734) (2,370)
Pooled Trust Preferred [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 0 0
Less than 12 Months, Unrealized Loss 0 0
12 Months or More, Fair Value 661 600
12 Months or More, Unrealized Loss (139) (200)
Total, Fair Value 661 600
Total, Unrealized Loss (139) (200)
Pooled SBA [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 36,842 3,521
Less than 12 Months, Unrealized Loss (2,296) (17)
12 Months or More, Fair Value 8,277 0
12 Months or More, Unrealized Loss (748) 0
Total, Fair Value 45,119 3,521
Total, Unrealized Loss (3,044) (17)
Other Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 985 0
Less than 12 Months, Unrealized Loss (35) 0
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Loss 0 0
Total, Fair Value 985 0
Total, Unrealized Loss $ (35) $ 0