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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
Mar. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value $ 296,579 $ 341,633
Less than 12 Months, Unrealized Loss (10,278) (16,734)
12 Months or More, Fair Value 84,724 58,496
12 Months or More, Unrealized Loss (5,825) (4,840)
Total, Fair Value 381,303 400,129
Total, Unrealized Loss (16,103) (21,574)
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 86,700 95,677
Less than 12 Months, Unrealized Loss (3,868) (5,394)
12 Months or More, Fair Value 28,237 17,964
12 Months or More, Unrealized Loss (1,242) (1,080)
Total, Fair Value 114,937 113,641
Total, Unrealized Loss (5,110) (6,474)
States and Political Subdivisions [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 40,214 57,526
Less than 12 Months, Unrealized Loss (1,037) (2,192)
12 Months or More, Fair Value 5,762 5,324
12 Months or More, Unrealized Loss (245) (125)
Total, Fair Value 45,976 62,850
Total, Unrealized Loss (1,282) (2,317)
Residential and Multi-Family Mortgage [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 143,416 150,229
Less than 12 Months, Unrealized Loss (4,088) (6,806)
12 Months or More, Fair Value 21,511 16,608
12 Months or More, Unrealized Loss (1,225) (1,014)
Total, Fair Value 164,927 166,837
Total, Unrealized Loss (5,313) (7,820)
Commercial Mortgage [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 0 374
Less than 12 Months, Unrealized Loss 0 (11)
12 Months or More, Fair Value 255 0
12 Months or More, Unrealized Loss (7) 0
Total, Fair Value 255 374
Total, Unrealized Loss (7) (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 9,761 9,662
12 Months or More, Unrealized Loss (1,637) (1,734)
Total, Fair Value 9,761 9,662
Total, Unrealized Loss (1,637) (1,734)
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 798 661
12 Months or More, Unrealized Loss (2) (139)
Total, Fair Value 798 661
Total, Unrealized Loss (2) (139)
Pooled SBA [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 25,259 36,842
Less than 12 Months, Unrealized Loss (1,255) (2,296)
12 Months or More, Fair Value 18,400 8,277
12 Months or More, Unrealized Loss (1,467) (748)
Total, Fair Value 43,659 45,119
Total, Unrealized Loss (2,722) (3,044)
Other Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 990 985
Less than 12 Months, Unrealized Loss (30) (35)
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Loss 0 0
Total, Fair Value 990 985
Total, Unrealized Loss $ (30) $ (35)