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Securities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2014 Securities | Dec. 31, 2013 Securities | Jun. 30, 2014 Four Structured Pool Trust Securities [Member] Securities | Jun. 30, 2013 Four Structured Pool Trust Securities [Member] | Jun. 30, 2014 Four Structured Pool Trust Securities [Member] Securities | Jun. 30, 2013 Four Structured Pool Trust Securities [Member] | Jun. 30, 2014 Pooled Trust Preferred [Member] | Dec. 31, 2013 Pooled Trust Preferred [Member]
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |  |  |
Number of securities holdings | 0 |  |  |  |  |  |  |
Shareholders' equity percentage | 10.00% |  |  |  |  |  |  |
Number of pooled trust securities |  |  | 1 |  | 1 |  |  |
Amortized Cost | $ 695,716 | $ 697,738 |  |  |  |  | $ 800 | $ 800
Fair Value | 695,419 | 685,991 |  |  |  |  | 798 | 661
Other than temporary impairment recognized in earnings for available for sale securities |  |  | 0 | 0 | 0 | 0 |  |
Number of structured pooled trust preferred securities deemed to be other-than-temporarily impaired | 4 | 4 |  |  |  |  |  |
Securities | $ 332,626 | $ 353,102 |  |  |  |  |  |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition The fair value of trading 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=35738203&loc=d3e5086-111524 + Details
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