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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, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | $ 106,735 | $ 196,901
Less than 12 Months, Unrealized Loss | (771) | (2,419)
12 Months or More, Fair Value | 134,831 | 64,882
12 Months or More, Unrealized Loss | (3,428) | (3,120)
Total, Fair Value | 241,566 | 261,783
Total, Unrealized Loss | (4,199) | (5,539)
U.S. Government Sponsored Entities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 55,696 | 90,380
Less than 12 Months, Unrealized Loss | (540) | (579)
12 Months or More, Fair Value | 34,754 | 0
12 Months or More, Unrealized Loss | (368) | 0
Total, Fair Value | 90,450 | 90,380
Total, Unrealized Loss | (908) | (579)
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 15,890 | 32,353
Less than 12 Months, Unrealized Loss | (69) | (448)
12 Months or More, Fair Value | 4,104 | 264
12 Months or More, Unrealized Loss | (245) | (201)
Total, Fair Value | 19,994 | 32,617
Total, Unrealized Loss | (314) | (649)
Residential and Multi-Family Mortgage [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 30,144 | 65,598
Less than 12 Months, Unrealized Loss | (153) | (1,255)
12 Months or More, Fair Value | 63,699 | 34,611
12 Months or More, Unrealized Loss | (1,729) | (1,127)
Total, Fair Value | 93,843 | 100,209
Total, Unrealized Loss | (1,882) | (2,382)
Corporate Notes and Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 5,005 | 2,089
Less than 12 Months, Unrealized Loss | (9) | (11)
12 Months or More, Fair Value | 9,042 | 8,476
12 Months or More, Unrealized Loss | (453) | (951)
Total, Fair Value | 14,047 | 10,565
Total, Unrealized Loss | (462) | (962)
Pooled SBA [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 0 | 6,481
Less than 12 Months, Unrealized Loss | 0 | (126)
12 Months or More, Fair Value | 22,270 | 20,560
12 Months or More, Unrealized Loss | (575) | (792)
Total, Fair Value | 22,270 | 27,041
Total, Unrealized Loss | (575) | (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 | 962 | 971
12 Months or More, Unrealized Loss | (58) | (49)
Total, Fair Value | 962 | 971
Total, Unrealized Loss | $ (58) | $ (49)

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