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Estimated Fair Values (Estimated Fair Values For Certain Financial Assets And Financial Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and due from banks | $ 543,471 |  | $ 533,599 |
Overnight investments | 1,161,469 |  | 859,324 |
Investment securities available for sale | 5,676,237 |  | 5,387,703 |
Investment securities held to maturity | 782 |  | 907 |
Loans held for sale | 53,361 |  | 47,271 |
FDIC Indemnification Asset | 74,784 |  | 93,397 |
Income earned not collected | 49,668 |  | 48,390 |
Deposits | 18,763,545 |  | 17,874,066 |
FDIC loss share payable | 111,339 |  | 109,378 |
Carrying Value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and due from banks | 543,471 |  | 533,599 |
Overnight investments | 1,161,469 |  | 859,324 |
Investment securities available for sale | 5,676,237 |  | 5,387,703 |
Investment securities held to maturity | 782 |  | 907 |
Loans held for sale | 53,361 |  | 47,271 |
Loans covered by loss share agreements, net of allowance for loan and lease losses | 1,225,825 |  | 975,906 |
Loans and leases not covered by loss share agreements, net of allowance for loan and lease losses | 12,022,277 |  | 11,924,424 |
FDIC Indemnification Asset | 74,784 | [1] | 93,397 | [1]
Income earned not collected | 49,668 |  | 48,390 |
Preferred stock | 17,783 |  | 33,564 |
Deposits | 18,763,545 |  | 17,874,066 |
Short-term borrowings | 617,794 |  | 511,418 |
Long-term obligations | 440,300 |  | 510,769 |
FDIC loss share payable | 111,339 |  | 109,378 |
Accrued interest payable | 5,675 |  | 6,737 |
Derivative Liability, Fair Value, Gross Liability | 6,501 |  | 7,220 |
Fair Value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and due from banks | 543,471 |  | 533,599 |
Overnight investments | 1,161,469 |  | 859,324 |
Investment securities available for sale | 5,676,237 |  | 5,387,703 |
Investment securities held to maturity | 835 |  | 974 |
Loans held for sale | 54,057 |  | 47,956 |
Loans covered by loss share agreements, net of allowance for loan and lease losses | 1,201,309 |  | 956,388 |
Loans and leases not covered by loss share agreements, net of allowance for loan and lease losses | 11,659,364 |  | 11,589,149 |
FDIC Indemnification Asset | 37,303 | [1] | 38,438 | [1]
Income earned not collected | 49,668 |  | 48,390 |
Stock issued by Federal Home Loan Bank | 34,417 |  | 40,819 |
Preferred stock | 18,521 |  | 34,786 |
Deposits | 18,785,474 |  | 17,898,570 |
Short-term borrowings | 617,794 |  | 511,418 |
Long-term obligations | 453,313 |  | 526,037 |
FDIC loss share payable | 115,129 |  | 111,941 |
Accrued interest payable | 5,675 |  | 6,737 |
Derivative Liability, Fair Value, Gross Liability | $ 6,501 |  | $ 7,220 |
[1] | The fair value of the FDIC receivable excludes amortization expected to be recognized in prospective periods.

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