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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 | Mar. 31, 2018 | Dec. 31, 2017
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Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | $ 187,610 | $ 106,735
Less than 12 Months, Unrealized Loss | (2,736) | (771)
12 Months or More, Fair Value | 129,911 | 134,831
12 Months or More, Unrealized Loss | (4,894) | (3,428)
Total, Fair Value | 317,521 | 241,566
Total, Unrealized Loss | (7,630) | (4,199)
U.S. Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 63,833 | 55,696
Less than 12 Months, Unrealized Loss | (1,262) | (540)
12 Months or More, Fair Value | 34,590 | 34,754
12 Months or More, Unrealized Loss | (492) | (368)
Total, Fair Value | 98,423 | 90,450
Total, Unrealized Loss | (1,754) | (908)
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 61,022 | 15,890
Less than 12 Months, Unrealized Loss | (456) | (69)
12 Months or More, Fair Value | 4,045 | 4,104
12 Months or More, Unrealized Loss | (302) | (245)
Total, Fair Value | 65,067 | 19,994
Total, Unrealized Loss | (758) | (314)
Residential and Multi-Family Mortgage [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 50,017 | 30,144
Less than 12 Months, Unrealized Loss | (913) | (153)
12 Months or More, Fair Value | 59,984 | 63,699
12 Months or More, Unrealized Loss | (2,556) | (1,729)
Total, Fair Value | 110,001 | 93,843
Total, Unrealized Loss | (3,469) | (1,882)
Corporate Notes and Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 5,225 | 5,005
Less than 12 Months, Unrealized Loss | (38) | (9)
12 Months or More, Fair Value | 9,077 | 9,042
12 Months or More, Unrealized Loss | (421) | (453)
Total, Fair Value | 14,302 | 14,047
Total, Unrealized Loss | (459) | (462)
Pooled SBA [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 7,513 | 0
Less than 12 Months, Unrealized Loss | (67) | 0
12 Months or More, Fair Value | 21,272 | 22,270
12 Months or More, Unrealized Loss | (1,046) | (575)
Total, Fair Value | 28,785 | 22,270
Total, Unrealized Loss | (1,113) | (575)
Other [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 | 943 | 962
12 Months or More, Unrealized Loss | (77) | (58)
Total, Fair Value | 943 | 962
Total, Unrealized Loss | $ (77) | $ (58)

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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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