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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, 2016 | Dec. 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | $ 14,621 | $ 152,344
Less than 12 Months, Unrealized Loss | (103) | (2,466)
12 Months or More, Fair Value | 75,239 | 121,004
12 Months or More, Unrealized Loss | (1,949) | (4,516)
Total, Fair Value | 89,860 | 273,348
Total, Unrealized Loss | (2,052) | (6,982)
U.S. Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 0 | 65,675
Less than 12 Months, Unrealized Loss | 0 | (640)
12 Months or More, Fair Value | 3,001 | 31,923
12 Months or More, Unrealized Loss | (1) | (488)
Total, Fair Value | 3,001 | 97,598
Total, Unrealized Loss | (1) | (1,128)
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 1,669 | 9,103
Less than 12 Months, Unrealized Loss | (2) | (234)
12 Months or More, Fair Value | 272 | 2,478
12 Months or More, Unrealized Loss | (193) | (9)
Total, Fair Value | 1,941 | 11,581
Total, Unrealized Loss | (195) | (243)
Residential and Multi-Family Mortgage [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 10,975 | 69,631
Less than 12 Months, Unrealized Loss | (78) | (1,562)
12 Months or More, Fair Value | 40,280 | 50,351
12 Months or More, Unrealized Loss | (433) | (1,832)
Total, Fair Value | 51,255 | 119,982
Total, Unrealized Loss | (511) | (3,394)
Corporate Notes and Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 1,977 | 5,027
Less than 12 Months, Unrealized Loss | (23) | (2)
12 Months or More, Fair Value | 8,251 | 8,144
12 Months or More, Unrealized Loss | (1,174) | (1,269)
Total, Fair Value | 10,228 | 13,171
Total, Unrealized Loss | (1,197) | (1,271)
Pooled SBA [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 0 | 2,908
Less than 12 Months, Unrealized Loss | 0 | (28)
12 Months or More, Fair Value | 22,441 | 27,127
12 Months or More, Unrealized Loss | (122) | (879)
Total, Fair Value | 22,441 | 30,035
Total, Unrealized Loss | (122) | (907)
Other Equity 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 | 994 | 981
12 Months or More, Unrealized Loss | (26) | (39)
Total, Fair Value | 994 | 981
Total, Unrealized Loss | $ (26) | $ (39)

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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=73527792&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=73527792&loc=d3e27337-111563 + Details
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