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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
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value $ 78,247 $ 341,633
Less than 12 Months, Unrealized Loss (2,444) (16,734)
12 Months or More, Fair Value 271,138 58,496
12 Months or More, Unrealized Loss (11,365) (4,840)
Total, Fair Value 349,385 400,129
Total, Unrealized Loss (13,809) (21,574)
U.S. Government Sponsored Entities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 4,857 95,677
Less than 12 Months, Unrealized Loss (1,604) (5,394)
12 Months or More, Fair Value 97,377 17,964
12 Months or More, Unrealized Loss (3,643) (1,080)
Total, Fair Value 102,234 113,641
Total, Unrealized Loss (5,247) (6,474)
States and Political Subdivisions [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 8,527 57,526
Less than 12 Months, Unrealized Loss (34) (2,192)
12 Months or More, Fair Value 23,517 5,324
12 Months or More, Unrealized Loss (681) (125)
Total, Fair Value 32,044 62,850
Total, Unrealized Loss (715) (2,317)
Residential and Multi-Family Mortgage [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 61,870 150,229
Less than 12 Months, Unrealized Loss (779) (6,806)
12 Months or More, Fair Value 101,485 16,608
12 Months or More, Unrealized Loss (3,634) (1,014)
Total, Fair Value 163,355 166,837
Total, Unrealized Loss (4,413) (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 188 0
12 Months or More, Unrealized Loss (5) 0
Total, Fair Value 188 374
Total, Unrealized Loss (5) (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 8,020 9,662
12 Months or More, Unrealized Loss (1,380) (1,734)
Total, Fair Value 8,020 9,662
Total, Unrealized Loss (1,380) (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 1,991 36,842
Less than 12 Months, Unrealized Loss (9) (2,296)
12 Months or More, Fair Value 39,753 8,277
12 Months or More, Unrealized Loss (2,020) (748)
Total, Fair Value 41,744 45,119
Total, Unrealized Loss (2,029) (3,044)
Other Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 1,002 985
Less than 12 Months, Unrealized Loss (18) (35)
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Loss 0 0
Total, Fair Value 1,002 985
Total, Unrealized Loss $ (18) $ (35)