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Investment Securities - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 USD ($) Securities | Sep. 30, 2015 USD ($) | Sep. 30, 2016 USD ($) Securities | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) Securities
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Held-to-maturity securities in continuous unrealized loss position, less than 12 Months | $ 0 |  | $ 0 |  | $ 129,000
Held-to-maturity securities in continuous unrealized loss position, 12 Months or Longer | $ 0 |  | $ 0 |  | $ 0
Number of securities in an unrealized loss position | Securities | 20 |  | 20 |  | 107
Percentage of combined depreciation of the combined reported value of the aggregate securities portfolio | 0.98% |  | 0.98% |  | 2.44%
Carrying amount of available-for-sale securities pledged | $ 151,820,000 |  | $ 151,820,000 |  | $ 236,730,000
OTTI charges incurred | 4,635,000 |  | 4,646,000 |  |
Debt Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
OTTI charges incurred | 4,640,000 | $ 0 | 4,640,000 | $ 0 |
Equity Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
OTTI charges incurred | $ 0 | $ 0 | $ 11,000 | $ 0 |

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- Definition Percentage of combined depreciation of the combined reported value of the aggregate securities portfolio. + References No definition available. + Details
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- Definition The fair value of available-for-sale securities that serve as collateral for borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5086-111524 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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