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Securities - Maturity of Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Held for Investment, Contractual maturity of debt securities, Amortized Cost |  |
Amortized cost, Within one year | $ 1,672 | $ 1,561
Amortized cost, After one year but within five years | 1,593 | 1,937
Amortized cost, After five years but within ten years | 667 | 707
Amortized cost, After ten years | 10 | 160
Amortized Cost | 3,942 | 4,365
Available for sale, Contractual maturity of debt securities, Amortized Cost |  |
Amortized Cost, Within one year | 66,022 | 66,542
Amortized Cost, After one year but within five years | 308,283 | 320,150
Amortized Cost, After five years but within ten years | 5,849 | 5,830
Amortized Cost, After ten years | 60,129 | 66,199
Total debt securities | 440,283 | 458,721
Amortized Cost, Equity securities | 6,450 | 6,594
Amortized Cost | 446,733 | 465,315
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value |  |
Estimated Fair Value, Within one year | 1,683 | 1,568
Estimated Fair Value, After one year but within five years | 1,603 | 1,951
Estimated Fair Value, After five years but within ten years | 674 | 723
Estimated Fair Value, After ten years | 15 | 161
Estimated Fair Value | 3,975 | 4,403
Available for sale, Contractual maturity of debt securities, Estimated Fair Value |  |
Estimated Fair Value, Within one year | 66,105 | 66,662
Estimated Fair Value, After one year but within five years | 308,913 | 319,839
Estimated Fair Value, After five years but within ten years | 6,184 | 6,152
Estimated Fair Value, After ten years | 60,303 | 66,246
Total debt securities | 441,505 | 458,899
Estimated Fair Value, Equity securities | 5,955 | 6,569
Estimated Fair Value, Total | $ 447,460 | $ 465,468

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- Definition Fair value of held-to-maturity debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 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)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing in the next fiscal year following the latest fiscal year. + 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 (f)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 + 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=82897076&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=82897076&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=82897076&loc=d3e27232-111563 + Details
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