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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2009 | Dec. 31, 2012 Plans Office
Number of days on which collection of interest on principal is no longer probable |  | 90 days
Period over which borrower has to demonstrate repayment performance in compliance with restructured terms to take loan out of nonaccrual status |  | 6 months
Original terms of modified loans |  | 6 months
Number of days on which charge-offs unsecured consumer loans are recorded |  | 120 days
Maximum loan amount for credit review process |  | $ 1,000,000
Agreed percentage of loss in loss sharing agreement | 80.00% | 80.00%
Loss recoveries on covered assets | 144,000,000 | 144,000,000
Loss amount with respect to covered assets | 26,700,000 | 26,700,000
Agreed percentage of reimbursement in loss reimburse agreement | 95.00% | 95.00%
Goodwill impairment |  | 0
Number of stock-based compensation plans |  | 3
Number of offices providing services, Citizens Trust |  | 3
Assets under administration, CitizensTrust |  | 2,100,000,000
Assets under management, CitizensTrust |  | $ 1,580,000,000
Minimum [Member] |  |
Number of days over which principal or interest payment are past due to consider non-covered loans |  | 30 days
Number of days for which principal or interest payment on non-covered loans remain accrual |  | 30 days
Maximum [Member] |  |
Number of days for which principal or interest payment on non-covered loans remain accrual |  | 89 days
Commercial Loans [Member] |  |
Loss sharing agreement term |  | 5 years
Loss recovery provision term |  | 8 years
Single Family Residential Loans [Member] |  |
Loss sharing agreement term |  | 10 years
Loss recovery provision term |  | 10 years

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