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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
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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)

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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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