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Capital and Regulatory Matters - Additional Information (Detail) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2007 | Mar. 31, 2016 USD ($) quarter | Dec. 31, 2015 USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Preferred stock value issued include for regulatory tier one capital calculations |  | $ 144,500 |
Preferred stock dividend rate percentage |  | 5.375% |
Corporation's aggregate subordinated notes |  | $ 136,083 | $ 136,069
Maximum dividends available without prior regulatory approval |  | $ 362,500 |
Maximum number of quarterly periods by which the corporation has the right to defer interest payments on junior subordinated deferrable interest debentures | quarter |  | 20 |
Trust Preferred Securities Tier One Allowable Portion [Member] |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Trust preferred securities |  |  | 33,300
Trust Preferred Securities Tier One Excluded Portion [Member] |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Trust preferred securities |  | $ 133,000 | 99,800
Floating Rate Subordinated Notes [Member] |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Permissible portion of subordinated note included in total capital |  |  | $ 20,000
Corporation's aggregate subordinated notes |  | $ 100,000 |
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 |
Debt Instrument, Maturity Date | Feb. 15, 2017 |  |

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