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Summary of Significant Accounting Policies (Details Textual) (USD $) | 3 Months Ended | 12 Months Ended |
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Mar. 31, 2012 Office Y OptionPlan Wealth_Management_Offices Banking_Centers Inactive_Subsidiaries Financial_Centers | Mar. 31, 2011 | Dec. 31, 2011 Loans | Oct. 16, 2009
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |  |
Number of inactive subsidiaries | 3 |  |  |
FCB Trust II redemption | Jan. 07, 2012 |  |  |
Bank operated business financial centers, number | 42 |  |  |
Bank operated commercial banking centers, number | 5 |  |  |
Bank operated wealth management offices, number | 2 |  |  |
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 |  |  |
Number of days on which charge offs unsecured consumer loan are recorded | 120 days |  |  |
Single-family mortgage loans returned to accrual status after demonstrating sustained repayment performance |  |  | 11 |
Related allowance | $ 1,510,000 |  | $ 2,968,000 |
Maximum loan amount for credit review process | 1,000,000 |  |  |
Provision for credit losses |  | 7,068,000 |  |
Estimated gross cash flows from loss sharing asset |  |  |  | 144,900,000
Properties under capital lease and leasehold improvements amortizable description | shorter of estimated economic lives of 15 years or the initial terms of the leases |  |  |
Properties under capital lease and leasehold estimated economic lives under option one | 15 years |  |  |
Number of Stock-Based Compensation Plans | 3 |  |  |
Number of offices providing services, Citizens trust | 2 |  |  |
Assets under administration, Citizens Trust | 2,110,000,000 |  |  |
Assets under management, Citizens Trust | 1,650,000,000 |  |  |
Core deposit and premium | 4,731,000 |  | 5,548,000 |
Goodwill | 55,097,000 |  | 55,097,000 |
Accumulated amortization | 27,300,000 |  |  |
Amortization expense intangible assets | 816,000,000 |  |  |
Estimated amortization expense for the remainder of 2012 | 1,300,000 |  |  |
Estimated amortization expense, for year one | 1,100,000 |  |  |
Estimated amortization expense, for year two | 475,000,000 |  |  |
Estimated amortization expense, for year three | 437,000,000 |  |  |
Estimated amortization expense, for year four | 395,000,000 |  |  |
Estimated amortization expense, for year five | $ 955,000,000 |  |  |
Weighted average remaining life of finite lived intangible assets | 1.4 |  |  |
Shares outstanding | 104,707,012 |  | 104,482,271 |
Original term of modified loans | 6 months |  |  |
Computer and equipment [Member] |  |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |  |
Estimated lives, minimum years | 3 |  |  |
Estimated lives, maximum years | 5 |  |  |
Furniture, fixtures and equipment [Member] |  |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |  |
Estimated lives, minimum years | 5 |  |  |
Estimated lives, maximum years | 7 |  |  |
Buildings and improvements [Member] |  |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |  |
Estimated lives, minimum years | 15 |  |  |
Estimated lives, maximum years | 40 |  |  |
Maximum [Member] |  |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |  |
Number of days for which principal or interest payment on non-covered loans remain accrual | 89 days |  |  |
Minimum [Member] |  |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |  |
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 |  |  |

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