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Amortized Cost and Fair Value of Held-to-Maturity Securities, Including Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | $ 47,133 | $ 72,541
Held-to-maturity Securities, Unrealized Gains | 135 | 78
Held-to-maturity Securities, Unrealized Losses | (2) | (129)
Held-to-maturity Securities, Fair Value | 47,266 | 72,490
U.S. Agency securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | 36,741 | 61,863
Held-to-maturity Securities, Unrealized Gains | 124 | 75
Held-to-maturity Securities, Unrealized Losses |  | (106)
Held-to-maturity Securities, Fair Value | 36,865 | 61,832
Corporate securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | 10,392 | 10,488
Held-to-maturity Securities, Unrealized Gains | 11 |
Held-to-maturity Securities, Unrealized Losses | (2) | (23)
Held-to-maturity Securities, Fair Value | $ 10,401 | 10,465
Municipal securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities, Amortized Cost |  | 190
Held-to-maturity Securities, Unrealized Gains |  | 3
Held-to-maturity Securities, Fair Value |  | $ 193

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- Definition Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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- Definition Amount before other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References No definition available. + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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