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Securities - Maturity of Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Held for Investment, Contractual maturity of debt securities, Amortized Cost |  |
Amortized cost, Within one year | $ 1,308 | $ 1,451
Amortized cost, After one year but within five years | 6,244 | 6,603
Amortized cost, After five years but within ten years | 237 | 380
Amortized cost, After ten years | 134 | 159
Amortized Cost | 7,923 | 8,593
Available for sale, Contractual maturity of debt securities, Amortized Cost |  |
Amortized Cost, Within one year | 166,121 | 41,772
Amortized Cost, After one year but within five years | 256,716 | 350,975
Amortized Cost, After five years but within ten years | 15,810 | 21,990
Amortized Cost, After ten years | 80,657 | 87,252
Total debt securities | 519,304 | 501,989
Amortized Cost, Equity securities | 6,093 | 7,364
Amortized Cost | 525,397 | 509,353
Held for Investment, Contractual maturity of debt securities, Estimated Fair Value |  |
Estimated Fair Value, Within one year | 1,317 | 1,456
Estimated Fair Value, After one year but within five years | 6,277 | 6,642
Estimated Fair Value, After five years but within ten years | 249 | 396
Estimated Fair Value, After ten years | 148 | 177
Estimated Fair Value | 7,991 | 8,671
Available for sale, Contractual maturity of debt securities, Estimated Fair Value |  |
Estimated Fair Value, Within one year | 166,327 | 41,870
Estimated Fair Value, After one year but within five years | 259,037 | 352,044
Estimated Fair Value, After five years but within ten years | 16,491 | 22,717
Estimated Fair Value, After ten years | 81,449 | 88,132
Total debt securities | 523,304 | 504,763
Estimated Fair Value, Equity securities | 6,092 | 11,427
Estimated Fair Value, Total | $ 529,396 | $ 516,190

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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=6957658&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=27724398&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=27724398&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=6957658&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=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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