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Securities - Maturity of Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Held for Investment, Contractual maturity of debt securities, Amortized Cost |  |
Amortized cost, Within one year | $ 975 | $ 1,036
Amortized cost, After one year but within five years | 428 | 623
Amortized cost, After five years but within ten years | 599 | 625
Amortized cost, After ten years | 6 | 8
Amortized Cost | 2,008 | 2,292
Available for sale, Contractual maturity of debt securities, Amortized Cost |  |
Amortized Cost, Within one year | 114,086 | 113,225
Amortized Cost, After one year but within five years | 296,057 | 289,038
Amortized Cost, After five years but within ten years | 6,129 | 6,222
Amortized Cost, After ten years | 49,472 | 55,813
Total debt securities | 465,744 | 464,298
Amortized Cost, Equity securities |  | 6,527
Amortized Cost | 465,744 | 470,825
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value |  |
Estimated Fair Value, Within one year | 978 | 1,034
Estimated Fair Value, After one year but within five years | 428 | 627
Estimated Fair Value, After five years but within ten years | 605 | 633
Estimated Fair Value, After ten years | 6 | 9
Estimated Fair Value | 2,017 | 2,303
Available for sale, Contractual maturity of debt securities, Estimated Fair Value |  |
Estimated Fair Value, Within one year | 113,828 | 112,974
Estimated Fair Value, After one year but within five years | 291,843 | 287,058
Estimated Fair Value, After five years but within ten years | 6,306 | 6,500
Estimated Fair Value, After ten years | 48,886 | 55,467
Total debt securities | 460,863 | 461,999
Estimated Fair Value, Equity securities |  | 5,704
Estimated Fair Value, Total | $ 460,863 | $ 467,703

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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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