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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
Sep. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value $ 99,744 $ 341,633
Less than 12 Months, Unrealized Loss (1,425) (16,734)
12 Months or More, Fair Value 258,742 58,496
12 Months or More, Unrealized Loss (9,736) (4,840)
Total, Fair Value 358,486 400,129
Total, Unrealized Loss (11,161) (21,574)
U.S. Government Sponsored Entities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 11,771 95,677
Less than 12 Months, Unrealized Loss (86) (5,394)
12 Months or More, Fair Value 96,192 17,964
12 Months or More, Unrealized Loss (2,978) (1,080)
Total, Fair Value 107,963 113,641
Total, Unrealized Loss (3,064) (6,474)
States and Political Subdivisions [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 4,360 57,526
Less than 12 Months, Unrealized Loss (8) (2,192)
12 Months or More, Fair Value 19,659 5,324
12 Months or More, Unrealized Loss (374) (125)
Total, Fair Value 24,019 62,850
Total, Unrealized Loss (382) (2,317)
Residential and Multi-Family Mortgage [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 83,613 150,229
Less than 12 Months, Unrealized Loss (1,331) (6,806)
12 Months or More, Fair Value 98,066 16,608
12 Months or More, Unrealized Loss (3,471) (1,014)
Total, Fair Value 181,679 166,837
Total, Unrealized Loss (4,802) (7,820)
Commercial Mortgage [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value   374
Less than 12 Months, Unrealized Loss   (11)
12 Months or More, Fair Value   0
12 Months or More, Unrealized Loss   0
Total, Fair Value   374
Total, Unrealized Loss   (11)
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 8,240 9,662
12 Months or More, Unrealized Loss (1,162) (1,734)
Total, Fair Value 8,240 9,662
Total, Unrealized Loss (1,162) (1,734)
Pooled Trust Preferred [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value   0
Less than 12 Months, Unrealized Loss   0
12 Months or More, Fair Value   661
12 Months or More, Unrealized Loss   (139)
Total, Fair Value   661
Total, Unrealized Loss   (139)
Pooled SBA [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 0 36,842
Less than 12 Months, Unrealized Loss 0 (2,296)
12 Months or More, Fair Value 35,588 8,277
12 Months or More, Unrealized Loss (1,728) (748)
Total, Fair Value 35,588 45,119
Total, Unrealized Loss (1,728) (3,044)
Other Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 0 985
Less than 12 Months, Unrealized Loss 0 (35)
12 Months or More, Fair Value 997 0
12 Months or More, Unrealized Loss (23) 0
Total, Fair Value 997 985
Total, Unrealized Loss $ (23) $ (35)