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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 | Dec. 31, 2013 | Dec. 31, 2012
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Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | $ 341,633 | $ 85,252
Less than 12 Months, Unrealized Loss | (16,734) | (923)
12 Months or More, Fair Value | 58,496 | 17,856
12 Months or More, Unrealized Loss | (4,840) | (2,584)
Total, Fair Value | 400,129 | 103,108
Total, Unrealized Loss | (21,574) | (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 | 95,677 | 41,715
Less than 12 Months, Unrealized Loss | (5,394) | (161)
12 Months or More, Fair Value | 17,964 | 0
12 Months or More, Unrealized Loss | (1,080) | 0
Total, Fair Value | 113,641 | 41,715
Total, Unrealized Loss | (6,474) | (161)
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 57,526 | 7,857
Less than 12 Months, Unrealized Loss | (2,192) | (57)
12 Months or More, Fair Value | 5,324 | 0
12 Months or More, Unrealized Loss | (125) | 0
Total, Fair Value | 62,850 | 7,857
Total, Unrealized Loss | (2,317) | (57)
Residential and Multi-Family Mortgage [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 150,229 | 32,159
Less than 12 Months, Unrealized Loss | (6,806) | (688)
12 Months or More, Fair Value | 16,608 | 4,254
12 Months or More, Unrealized Loss | (1,014) | (14)
Total, Fair Value | 166,837 | 36,413
Total, Unrealized Loss | (7,820) | (702)
Commercial Mortgage [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 374 | 0
Less than 12 Months, Unrealized Loss | (11) | 0
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Loss | 0 | 0
Total, Fair Value | 374 | 0
Total, Unrealized Loss | (11) | 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 | 9,662 | 13,002
12 Months or More, Unrealized Loss | (1,734) | (2,370)
Total, Fair Value | 9,662 | 13,002
Total, Unrealized Loss | (1,734) | (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 | 661 | 600
12 Months or More, Unrealized Loss | (139) | (200)
Total, Fair Value | 661 | 600
Total, Unrealized Loss | (139) | (200)
Pooled SBA [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 36,842 | 3,521
Less than 12 Months, Unrealized Loss | (2,296) | (17)
12 Months or More, Fair Value | 8,277 | 0
12 Months or More, Unrealized Loss | (748) | 0
Total, Fair Value | 45,119 | 3,521
Total, Unrealized Loss | (3,044) | (17)
Other Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 985 | 0
Less than 12 Months, Unrealized Loss | (35) | 0
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Loss | 0 | 0
Total, Fair Value | 985 | 0
Total, Unrealized Loss | $ (35) | $ 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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