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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 | Sep. 30, 2015 | Dec. 31, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | $ 136,060 | $ 117,835
Less than 12 Months, Unrealized Loss | (1,311) | (961)
12 Months or More, Fair Value | 129,088 | 240,321
12 Months or More, Unrealized Loss | (3,012) | (7,543)
Total, Fair Value | 265,148 | 358,156
Total, Unrealized Loss | (4,323) | (8,504)
U.S. Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 44,488 | 26,069
Less than 12 Months, Unrealized Loss | (263) | (149)
12 Months or More, Fair Value | 37,250 | 85,016
12 Months or More, Unrealized Loss | (270) | (2,070)
Total, Fair Value | 84,738 | 111,085
Total, Unrealized Loss | (533) | (2,219)
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 19,065 | 16,398
Less than 12 Months, Unrealized Loss | (167) | (179)
12 Months or More, Fair Value | 3,134 | 12,363
12 Months or More, Unrealized Loss | (62) | (223)
Total, Fair Value | 22,199 | 28,761
Total, Unrealized Loss | (229) | (402)
Residential and Multi-Family Mortgage [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 69,507 | 70,360
Less than 12 Months, Unrealized Loss | (881) | (603)
12 Months or More, Fair Value | 50,734 | 99,397
12 Months or More, Unrealized Loss | (1,068) | (2,202)
Total, Fair Value | 120,241 | 169,757
Total, Unrealized Loss | (1,949) | (2,805)
Corporate Notes and Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 0 | 5,008
Less than 12 Months, Unrealized Loss | 0 | (30)
12 Months or More, Fair Value | 8,477 | 7,935
12 Months or More, Unrealized Loss | (936) | (1,470)
Total, Fair Value | 8,477 | 12,943
Total, Unrealized Loss | (936) | (1,500)
Pooled SBA [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 | 28,500 | 34,608
12 Months or More, Unrealized Loss | (649) | (1,560)
Total, Fair Value | 28,500 | 34,608
Total, Unrealized Loss | (649) | (1,560)
Other Securities [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 | 993 | 1,002
12 Months or More, Unrealized Loss | (27) | (18)
Total, Fair Value | 993 | 1,002
Total, Unrealized Loss | $ (27) | $ (18)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
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