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Investment Securities - Additional Information (Detail) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 USD ($) Securities | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) Securities | Jun. 30, 2014 USD ($) | Dec. 31, 2014 USD ($) Securities
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Number of securities in an unrealized loss position | Securities | 131 |  | 131 |  | 97
Percentage of combined depreciation of the combined reported value of the aggregate securities portfolio | 2.58% |  | 2.58% |  | 3.21%
OTTI charges incurred |  | $ 254 |  | $ 518 |
Carrying value of available-for-sale securities as security for various purposes | $ 244,960 |  | $ 244,960 |  | $ 268,780
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 | 254 | 0 | 486 |
Equity Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
OTTI charges incurred | $ 0 | $ 0 | $ 0 | $ 32 |

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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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