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Amortized Cost and Aggregate Fair Value of Held-to-Maturity Securities, Including Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | $ 72,541 | $ 57,948
Held-to-maturity Securities, Unrealized Gains | 78 | 29
Held-to-maturity Securities, Unrealized Losses | (129) | (88)
Held-to-maturity Securities, Fair Value | 72,490 | 57,889
U.S. Agency securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | 61,863 | 46,987
Held-to-maturity Securities, Unrealized Gains | 75 | 22
Held-to-maturity Securities, Unrealized Losses | (106) | (54)
Held-to-maturity Securities, Fair Value | 61,832 | 46,955
Corporate securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | 10,488 | 10,582
Held-to-maturity Securities, Unrealized Losses | (23) | (34)
Held-to-maturity Securities, Fair Value | 10,465 | 10,548
Municipal securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Held-to-maturity Securities, Amortized Cost | 190 | 379
Held-to-maturity Securities, Unrealized Gains | 3 | 7
Held-to-maturity Securities, Fair Value | $ 193 | $ 386

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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=27724398&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=27724398&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=27724398&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=27724398&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=27724398&loc=d3e27232-111563 + Details
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