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Amortized Cost and Fair Value, Of Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Available-for-Sale |  |
Due within one year, Amortized cost | $ 1,135 |
Due after one year but within five years, Amortized cost | 1,036 |
Due after five years but within ten years, Amortized cost | 88,449 |
Due after ten years, Amortized cost | 44,485 |
Amortized Cost | 166,450 | $ 372,389
Due within one year, Fair value | 1,141 |
Due after one year but within five years, Fair value | 1,060 |
Due after five years but within ten years, Fair value | 90,360 |
Due after ten years, Fair value | 42,054 |
Fair Value | 165,579 | 366,173
Held-to-Maturity |  |
Due One year or less, Amortized cost | 21,851 |
Due after one year but within five years, Amortized cost | 25,282 |
Due after five years but within ten years, Amortized cost | 0 |
Due after ten years, Amortized cost | 0 |
Held-to-maturity Securities, Amortized Cost | 47,133 | 72,541
Held-to-maturity securities |  |
Due One year or less, Amortized cost | 21,864 |
Due after one year but within five years, Fair value | 25,402 |
Due after five years but within ten years, Fair value | 0 |
Due after ten years, Fair value | 0 |
Total fair value | 47,266 | 72,490
US Treasury Securities |  |
Held-to-Maturity |  |
Due One year or less, Amortized cost | 18,756 |
Due after one year but within five years, Amortized cost | 17,985 |
Due after five years but within ten years, Amortized cost | 0 |
Due after ten years, Amortized cost | 0 |
Held-to-maturity Securities, Amortized Cost | 36,741 |
Held-to-maturity securities |  |
Due One year or less, Amortized cost | 18,768 |
Due after one year but within five years, Fair value | 18,097 |
Due after five years but within ten years, Fair value | 0 |
Due after ten years, Fair value | 0 |
Total fair value | 36,865 |
Municipal securities |  |
Available-for-Sale |  |
Due within one year, Amortized cost | 1,135 |
Due after one year but within five years, Amortized cost | 1,035 |
Due after five years but within ten years, Amortized cost | 88,449 |
Due after ten years, Amortized cost | 21,040 |
Amortized Cost | 111,659 | 124,880
Due within one year, Fair value | 1,141 |
Due after one year but within five years, Fair value | 1,059 |
Due after five years but within ten years, Fair value | 90,360 |
Due after ten years, Fair value | 20,771 |
Fair Value | 113,331 | 128,678
Held-to-Maturity |  |
Held-to-maturity Securities, Amortized Cost |  | 190
Held-to-maturity securities |  |
Total fair value |  | 193
Corporate securities |  |
Available-for-Sale |  |
Due after ten years, Amortized cost | 22,104 |
Due after ten years, Fair value | 19,939 |
Held-to-Maturity |  |
Due One year or less, Amortized cost | 3,095 |
Due after one year but within five years, Amortized cost | 7,297 |
Due after five years but within ten years, Amortized cost | 0 |
Due after ten years, Amortized cost | 0 |
Held-to-maturity Securities, Amortized Cost | 10,392 |
Held-to-maturity securities |  |
Due One year or less, Amortized cost | 3,096 |
Due after one year but within five years, Fair value | 7,305 |
Due after five years but within ten years, Fair value | 0 |
Due after ten years, Fair value | 0 |
Total fair value | 10,401 |
U.S. Agency securities |  |
Available-for-Sale |  |
Due after one year but within five years, Amortized cost | 1 |
Due after ten years, Amortized cost | 1,341 |
Due after one year but within five years, Fair value | 1 |
Due after ten years, Fair value | 1,344 |
Total Mortgage Backed Securities |  |
Available-for-Sale |  |
Amortized Cost | 31,290 |
Fair Value | 30,891 |
Debt Securities |  |
Available-for-Sale |  |
Amortized Cost | 135,105 |
Fair Value | 134,615 |
Debt Securities | Municipal securities |  |
Available-for-Sale |  |
Amortized Cost | 111,659 |
Fair Value | 113,331 |
Debt Securities | Corporate securities |  |
Available-for-Sale |  |
Amortized Cost | 22,104 |
Fair Value | 19,939 |
Debt Securities | U.S. Agency securities |  |
Available-for-Sale |  |
Amortized Cost | 1,342 |
Fair Value | 1,345 |
Equity Securities |  |
Available-for-Sale |  |
Amortized Cost | 55 | 66
Fair Value | $ 73 | $ 72

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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