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Securities - Additional Information (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) Securities | Jun. 30, 2016 Securities | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) Securities | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) Securities
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Number of securities holdings | Securities | 0 |  |  | 0 |  | 0
Shareholders' equity percentage | 10.00% |  |  | 10.00% |  | 10.00%
Proceeds from sale of securities | $ 0 |  | $ 38,025 | $ 4,420 | $ 86,554 |
Securities | 347,196 |  |  | 347,196 |  | $ 312,669
Pooled Trust Preferred [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Number of structured pooled trust preferred securities sold | Securities |  | 2 |  |  |  |
Amortized cost of securities | 1,983 |  |  | 1,983 |  |
Proceeds from sale of securities | $ 922 |  |  | $ 922 |  |

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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 + Details
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