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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 | Dec. 31, 2016 | Dec. 31, 2015
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Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | $ 196,901 | $ 152,344
Less than 12 Months, Unrealized Loss | (2,419) | (2,466)
12 Months or More, Fair Value | 64,882 | 121,004
12 Months or More, Unrealized Loss | (3,120) | (4,516)
Total, Fair Value | 261,783 | 273,348
Total, Unrealized Loss | (5,539) | (6,982)
U.S. Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 90,380 | 65,675
Less than 12 Months, Unrealized Loss | (579) | (640)
12 Months or More, Fair Value | 0 | 31,923
12 Months or More, Unrealized Loss | 0 | (488)
Total, Fair Value | 90,380 | 97,598
Total, Unrealized Loss | (579) | (1,128)
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 32,353 | 9,103
Less than 12 Months, Unrealized Loss | (448) | (234)
12 Months or More, Fair Value | 264 | 2,478
12 Months or More, Unrealized Loss | (201) | (9)
Total, Fair Value | 32,617 | 11,581
Total, Unrealized Loss | (649) | (243)
Residential and Multi-Family Mortgage [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 65,598 | 69,631
Less than 12 Months, Unrealized Loss | (1,255) | (1,562)
12 Months or More, Fair Value | 34,611 | 50,351
12 Months or More, Unrealized Loss | (1,127) | (1,832)
Total, Fair Value | 100,209 | 119,982
Total, Unrealized Loss | (2,382) | (3,394)
Corporate Notes and Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 2,089 | 5,027
Less than 12 Months, Unrealized Loss | (11) | (2)
12 Months or More, Fair Value | 8,476 | 8,144
12 Months or More, Unrealized Loss | (951) | (1,269)
Total, Fair Value | 10,565 | 13,171
Total, Unrealized Loss | (962) | (1,271)
Pooled SBA [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 6,481 | 2,908
Less than 12 Months, Unrealized Loss | (126) | (28)
12 Months or More, Fair Value | 20,560 | 27,127
12 Months or More, Unrealized Loss | (792) | (879)
Total, Fair Value | 27,041 | 30,035
Total, Unrealized Loss | (918) | (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 | 971 | 981
12 Months or More, Unrealized Loss | (49) | (39)
Total, Fair Value | 971 | 981
Total, Unrealized Loss | $ (49) | $ (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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