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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, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | $ 92,037 | $ 196,901
Less than 12 Months, Unrealized Loss | (580) | (2,419)
12 Months or More, Fair Value | 77,951 | 64,882
12 Months or More, Unrealized Loss | (2,182) | (3,120)
Total, Fair Value | 169,988 | 261,783
Total, Unrealized Loss | (2,762) | (5,539)
U.S. Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 50,112 | 90,380
Less than 12 Months, Unrealized Loss | (204) | (579)
12 Months or More, Fair Value | 3,398 | 0
12 Months or More, Unrealized Loss | (2) | 0
Total, Fair Value | 53,510 | 90,380
Total, Unrealized Loss | (206) | (579)
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 3,562 | 32,353
Less than 12 Months, Unrealized Loss | (50) | (448)
12 Months or More, Fair Value | 1,524 | 264
12 Months or More, Unrealized Loss | (216) | (201)
Total, Fair Value | 5,086 | 32,617
Total, Unrealized Loss | (266) | (649)
Residential and Multi-Family Mortgage [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 33,692 | 65,598
Less than 12 Months, Unrealized Loss | (259) | (1,255)
12 Months or More, Fair Value | 44,212 | 34,611
12 Months or More, Unrealized Loss | (935) | (1,127)
Total, Fair Value | 77,904 | 100,209
Total, Unrealized Loss | (1,194) | (2,382)
Corporate Notes and Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 0 | 2,089
Less than 12 Months, Unrealized Loss | 0 | (11)
12 Months or More, Fair Value | 9,068 | 8,476
12 Months or More, Unrealized Loss | (426) | (951)
Total, Fair Value | 9,068 | 10,565
Total, Unrealized Loss | (426) | (962)
Pooled SBA [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 4,671 | 6,481
Less than 12 Months, Unrealized Loss | (67) | (126)
12 Months or More, Fair Value | 18,780 | 20,560
12 Months or More, Unrealized Loss | (552) | (792)
Total, Fair Value | 23,451 | 27,041
Total, Unrealized Loss | (619) | (918)
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 | 969 | 971
12 Months or More, Unrealized Loss | (51) | (49)
Total, Fair Value | 969 | 971
Total, Unrealized Loss | $ (51) | $ (49)

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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=82897076&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=82897076&loc=d3e27337-111563 + Details
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