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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, 2013 | Dec. 31, 2012
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Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | $ 369,935 | $ 85,252
Less than 12 Months, Unrealized Loss | (17,046) | (923)
12 Months or More, Fair Value | 17,930 | 17,856
12 Months or More, Unrealized Loss | (1,974) | (2,584)
Total, Fair Value | 387,865 | 103,108
Total, Unrealized Loss | (19,020) | (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 | 110,419 | 41,715
Less than 12 Months, Unrealized Loss | (5,820) | (161)
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Loss | 0 | 0
Total, Fair Value | 110,419 | 41,715
Total, Unrealized Loss | (5,820) | (161)
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 58,955 | 7,857
Less than 12 Months, Unrealized Loss | (2,047) | (57)
12 Months or More, Fair Value | 474 | 0
12 Months or More, Unrealized Loss | (9) | 0
Total, Fair Value | 59,429 | 7,857
Total, Unrealized Loss | (2,056) | (57)
Residential and Multi Family Mortgage [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 157,880 | 32,159
Less than 12 Months, Unrealized Loss | (6,201) | (688)
12 Months or More, Fair Value | 5,124 | 4,254
12 Months or More, Unrealized Loss | (171) | (14)
Total, Fair Value | 163,004 | 36,413
Total, Unrealized Loss | (6,372) | (702)
Commercial Mortgage [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 950 | 0
Less than 12 Months, Unrealized Loss | (21) | 0
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Loss | 0 | 0
Total, Fair Value | 950 | 0
Total, Unrealized Loss | (21) | 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 | 9,754 | 13,002
12 Months or More, Unrealized Loss | (1,640) | (2,370)
Total, Fair Value | 9,754 | 13,002
Total, Unrealized Loss | (1,640) | (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 | 776 | 600
12 Months or More, Unrealized Loss | (24) | (200)
Total, Fair Value | 776 | 600
Total, Unrealized Loss | (24) | (200)
Pooled SBA [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 40,735 | 3,521
Less than 12 Months, Unrealized Loss | (2,933) | (17)
12 Months or More, Fair Value | 1,802 | 0
12 Months or More, Unrealized Loss | (130) | 0
Total, Fair Value | 42,537 | 3,521
Total, Unrealized Loss | (3,063) | (17)
Other Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 996 | 0
Less than 12 Months, Unrealized Loss | (24) | 0
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Loss | 0 | 0
Total, Fair Value | 996 | 0
Total, Unrealized Loss | $ (24) | $ 0

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- Definition Amount of accumulated pre-tax unrealized loss on investments in available-for-sale securities that have been in a loss position for twelve months or longer impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss on investments on securities classified as available-for-sale securities impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months impacting investments. + References No definition available. + Details
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