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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 | Mar. 31, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | $ 296,579 | $ 341,633
Less than 12 Months, Unrealized Loss | (10,278) | (16,734)
12 Months or More, Fair Value | 84,724 | 58,496
12 Months or More, Unrealized Loss | (5,825) | (4,840)
Total, Fair Value | 381,303 | 400,129
Total, Unrealized Loss | (16,103) | (21,574)
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 | 86,700 | 95,677
Less than 12 Months, Unrealized Loss | (3,868) | (5,394)
12 Months or More, Fair Value | 28,237 | 17,964
12 Months or More, Unrealized Loss | (1,242) | (1,080)
Total, Fair Value | 114,937 | 113,641
Total, Unrealized Loss | (5,110) | (6,474)
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 40,214 | 57,526
Less than 12 Months, Unrealized Loss | (1,037) | (2,192)
12 Months or More, Fair Value | 5,762 | 5,324
12 Months or More, Unrealized Loss | (245) | (125)
Total, Fair Value | 45,976 | 62,850
Total, Unrealized Loss | (1,282) | (2,317)
Residential and Multi-Family Mortgage [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 143,416 | 150,229
Less than 12 Months, Unrealized Loss | (4,088) | (6,806)
12 Months or More, Fair Value | 21,511 | 16,608
12 Months or More, Unrealized Loss | (1,225) | (1,014)
Total, Fair Value | 164,927 | 166,837
Total, Unrealized Loss | (5,313) | (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 | 255 | 0
12 Months or More, Unrealized Loss | (7) | 0
Total, Fair Value | 255 | 374
Total, Unrealized Loss | (7) | (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 | 9,761 | 9,662
12 Months or More, Unrealized Loss | (1,637) | (1,734)
Total, Fair Value | 9,761 | 9,662
Total, Unrealized Loss | (1,637) | (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 | 25,259 | 36,842
Less than 12 Months, Unrealized Loss | (1,255) | (2,296)
12 Months or More, Fair Value | 18,400 | 8,277
12 Months or More, Unrealized Loss | (1,467) | (748)
Total, Fair Value | 43,659 | 45,119
Total, Unrealized Loss | (2,722) | (3,044)
Other Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 990 | 985
Less than 12 Months, Unrealized Loss | (30) | (35)
12 Months or More, Fair Value | 0 | 0
12 Months or More, Unrealized Loss | 0 | 0
Total, Fair Value | 990 | 985
Total, Unrealized Loss | $ (30) | $ (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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