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Securities - Gross Unrealized Losses, Aggregated by Investment Category and Length of Time (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | $ (153) | $ (32)
Fair Value, Less Than Twelve Months | 46,699 | 8,900
Gross Unrealized Losses, Twelve Months and Over | (284) | (1,914)
Fair Value, Twelve Months and Over | 50,239 | 123,852
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (1) |
Fair Value, Less Than Twelve Months | 5,112 |
Gross Unrealized Losses, Twelve Months and Over | (80) | (440)
Fair Value, Twelve Months and Over | 15,337 | 25,393
U.S. Government Agency [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (63) | (1)
Fair Value, Less Than Twelve Months | 26,934 | 5,458
Gross Unrealized Losses, Twelve Months and Over | (146) | (1,310)
Fair Value, Twelve Months and Over | 29,977 | 82,803
Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (5) |
Fair Value, Less Than Twelve Months | 5,143 |
Gross Unrealized Losses, Twelve Months and Over | (32) | (62)
Fair Value, Twelve Months and Over | 3,732 | 7,900
State and Local Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross Unrealized Losses, Less Than Twelve Months | (84) | (31)
Fair Value, Less Than Twelve Months | 9,510 | 3,442
Gross Unrealized Losses, Twelve Months and Over | (26) | (102)
Fair Value, Twelve Months and Over | $ 1,193 | $ 7,756

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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=27724398&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=27724398&loc=d3e27337-111563 + Details
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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 less than twelve months. + 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=27724398&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=27724398&loc=d3e27337-111563 + Details
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