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Capital and Regulatory Matters - Additional Information (Detail) (USD $) | 1 Months Ended | 6 Months Ended |  | 6 Months Ended | 12 Months Ended | 1 Months Ended |  | 1 Months Ended |  |  |  |
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Aug. 31, 2013 | Feb. 28, 2013 | Jun. 30, 2014 quarter | Jun. 30, 2013 | Dec. 31, 2013 | Jun. 30, 2014 Floating Rate Subordinated Notes [Member] | Dec. 31, 2013 Floating Rate Subordinated Notes [Member] | Feb. 28, 2013 Non-Cumulative Perpetual Preferred Stock and Series A Preferred Stock [Member] | Feb. 15, 2013 Non-Cumulative Perpetual Preferred Stock and Series A Preferred Stock [Member] | Feb. 28, 2013 Non-Cumulative Perpetual Preferred Stock [Member] | Feb. 15, 2013 Non-Cumulative Perpetual Preferred Stock [Member] | Jun. 30, 2014 Series A Preferred Stock [Member] | Dec. 31, 2013 Series A Preferred Stock [Member] | Feb. 15, 2013 Series A Preferred Stock [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock value issued include for regulatory tier one capital calculations |  |  | $ 144,500,000 |  |  |  |  |  |  |  |  |  |  |
Preferred stock dividend rate percentage |  |  | 5.375% |  |  |  |  |  |  | 5.375% |  |  |  |
Trust preferred securities |  |  | 133,000,000 |  |  |  |  |  |  |  |  |  |  |
Corporation's aggregate subordinated notes |  |  | 137,115,000 |  | 123,712,000 | 100,000,000 |  |  |  |  |  |  |  |
Per Year Percentage decrease in permissible portion of subordinate note included in Total Capital |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |
Final years of the term of the notes |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Permissible portion of subordinated note included in total capital |  |  |  |  |  | 40,000,000 | 60,000,000 |  |  |  |  |  |  |
Preferred stock shares issued |  |  | 6,000,000 |  | 6,000,000 |  |  |  | 6,000,000 |  |  |  |  |
Preferred stock aggregate liquidation preference value |  |  |  |  |  |  |  |  | 150,000,000 |  |  | 25 | 25 |
Preferred stock, par value |  |  | $ 0.01 |  | $ 0.01 |  |  |  |  |  | $ 0.01 |  |  |
Preferred stock liquidation preference per share |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25
Net proceeds from the issuance and sale of the Preferred Stock |  |  | 0 | 144,486,000 |  |  |  | 144,500,000 |  |  |  |  |  |
Accelerated share repurchase program repurchase amount |  | 144,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchase program repurchase share | 331,671 | 1,905,077 |  |  |  |  |  |  |  |  |  |  |  |
Accelerated share repurchase program repurchase share percent |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program authorized amount |  |  | 150,000,000 |  |  |  |  |  |  |  |  |  |  |
Maximum dividends available without prior regulatory approval |  |  | $ 272,000,000 |  |  |  |  |  |  |  |  |  |  |
Maximum number of quarterly periods by which the corporation has the right to defer interest payments on junior subordinated deferrable interest debentures |  |  | 20 |  |  |  |  |  |  |  |  |  |  |
Minimum number of days to be considered past due |  |  | 90 days |  |  |  |  |  |  |  |  |  |  |

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13, 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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