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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, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value $ 372,249 $ 85,252
Less than 12 Months, Unrealized Loss (13,825) (923)
12 Months or More, Fair Value 16,397 17,856
12 Months or More, Unrealized Loss (2,058) (2,584)
Total, Fair Value 388,646 103,108
Total, Unrealized Loss (15,883) (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 110,070 41,715
Less than 12 Months, Unrealized Loss (4,519) (161)
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Loss 0 0
Total, Fair Value 110,070 41,715
Total, Unrealized Loss (4,519) (161)
States and Political Subdivisions [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 62,488 7,857
Less than 12 Months, Unrealized Loss (2,460) (57)
12 Months or More, Fair Value 472 0
12 Months or More, Unrealized Loss (13) 0
Total, Fair Value 62,960 7,857
Total, Unrealized Loss (2,473) (57)
Residential & Multi Family Mortgage [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 158,788 32,159
Less than 12 Months, Unrealized Loss (5,695) (688)
12 Months or More, Fair Value 5,575 4,254
12 Months or More, Unrealized Loss (204) (14)
Total, Fair Value 164,363 36,413
Total, Unrealized Loss (5,899) (702)
Commercial Mortgage [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 983 0
Less than 12 Months, Unrealized Loss (12) 0
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Loss 0 0
Total, Fair Value 983 0
Total, Unrealized Loss (12) 0
Corporate Notes and Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 1,597 0
Less than 12 Months, Unrealized Loss (3) 0
12 Months or More, Fair Value 9,720 13,002
12 Months or More, Unrealized Loss (1,671) (2,370)
Total, Fair Value 11,317 13,002
Total, Unrealized Loss (1,674) (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 630 600
12 Months or More, Unrealized Loss (170) (200)
Total, Fair Value 630 600
Total, Unrealized Loss (170) (200)
Pooled SBA [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 37,325 3,521
Less than 12 Months, Unrealized Loss (1,114) (17)
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Loss 0 0
Total, Fair Value 37,325 3,521
Total, Unrealized Loss (1,114) (17)
Other Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Less than 12 Months, Fair Value 998 0
Less than 12 Months, Unrealized Loss (22) 0
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Loss 0 0
Total, Fair Value 998 0
Total, Unrealized Loss $ (22) $ 0