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Summary of Significant Accounting Policies - Additional Information (Detail) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 16, 2009 USD ($) | Sep. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) Segment Office Portfolios
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of operating business segments | Segment |  |  | 2
Fair value of securities |  | $ 898,600,000 |
Net unrealized holding gain after tax |  | $ 3,900,000 |
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
Minimum loan amount for credit review process |  |  | $ 1,000,000
Allowance for loan losses look-back period, revised |  |  | Rolling 20-quarters
Number of loan segments with similar risk characteristics | Portfolios |  |  | 8
Agreed percentage of losses in loss sharing agreement | 80.00% |  |
Loss amount with respect to covered assets | $ 26,700,000 |  |
Agreed percentage of reimbursement in loss sharing agreement | 95.00% |  |
Commercial loans expiration date |  |  | Oct. 16, 2014
Goodwill impairment |  |  | $ 0
Number of offices providing services, CitizensTrust | Office |  |  | 3
Assets under administration, CitizensTrust |  |  | $ 2,420,000,000
Assets under management, CitizensTrust |  |  | $ 1,880,000,000
Commercial Loans [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Loss sharing agreement term | 5 years |  |
Loss recovery provisions term | 8 years |  |
Single-family Residential Loans [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Loss sharing agreement term | 10 years |  |
Loss recovery provisions term | 10 years |  |
Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of days over which principal or interest payments are past due to consider loans, excluding PCI loans |  |  | 30 days
Number of days for which principal or interest payments on loans, excluding PCI loans remain accrual |  |  | 30 days
Length of modified debt term |  |  | 3 months
Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of days for which principal or interest payments on loans, excluding PCI loans remain accrual |  |  | 89 days
Length of modified debt term |  |  | 12 months
Loss recoveries on covered assets | $ 144,000,000 |  |

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