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Investment Securities - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 USD ($) Securities | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) Securities | Sep. 30, 2014 USD ($) | Dec. 31, 2014 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 |  | $ 88,000
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 | 108 |  | 108 |  | 97
Percentage of combined depreciation of the combined reported value of the aggregate securities portfolio | 1.88% |  | 1.88% |  | 3.21%
OTTI charges incurred |  | $ 219,000 |  | $ 737,000 |
Carrying value of available-for-sale securities as security for various purposes | $ 243,750,000 |  | $ 243,750,000 |  | $ 268,780,000
Debt Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
OTTI charges incurred | 0 | 0 | 0 | 0 |
Non Agency Mortgage Backed Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
OTTI charges incurred | 0 | 219,000 | 0 | 705,000 |
Equity Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
OTTI charges incurred | $ 0 | $ 0 | $ 0 | $ 32,000 |

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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=49124121&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=27724398&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=27724398&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=27724398&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=27724398&loc=d3e27290-111563 + Details
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