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Estimated Fair Values (Estimated Fair Values For Certain Financial Assets And Financial Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and due from banks |  | $ 534,086 | $ 604,182 |  |
Overnight investments |  | 2,063,132 | 1,724,919 |  |
Investment securities available for sale |  | 6,861,293 | 7,171,917 |  |
Investment securities held to maturity |  | 255 | 518 |  |
Loans and Leases Receivable, Net Amount |  | 20,033,774 | 18,564,999 |  |
FDIC Indemnification Asset |  | 4,054 | 28,701 | $ 93,397 | $ 270,192
Income earned not collected |  | 70,036 | 57,254 |  |
Deposits |  | 26,930,755 | 25,678,577 |  |
Short-term borrowings |  | 594,733 | 987,184 |  |
Long-term obligations |  | 704,155 | 351,320 |  |
FDIC loss share payable |  | 126,453 | 116,535 |  |
Carrying Value |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and due from banks |  | 534,086 | 604,182 |  |
Overnight investments |  | 2,063,132 | 1,724,919 |  |
Investment securities available for sale |  | 6,861,293 | 7,171,917 |  |
Investment securities held to maturity |  | 255 | 518 |  |
Loans held for sale |  | 59,766 | 63,696 |  |
Loans and Leases Receivable, Net Amount |  | 20,033,774 | 18,564,999 |  |
FDIC Indemnification Asset | [1] | 4,054 | 28,701 |  |
Income earned not collected |  | 70,036 | 57,254 |  |
Stock issued by Federal Home Loan Bank |  | 37,511 | 39,113 |  |
Servicing Asset |  | 19,351 | 16,688 |  |
Deposits |  | 26,930,755 | 25,678,577 |  |
Short-term borrowings |  | 594,733 | 987,184 |  |
Long-term obligations |  | 704,155 | 351,320 |  |
FDIC loss share payable |  | 126,453 | 116,535 |  |
Accrued interest payable |  | 5,713 | 8,194 |  |
Derivative Liability, Fair Value, Gross Liability |  | 1,429 | 4,337 |  |
Fair Value |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and due from banks |  | 534,086 | 604,182 |  |
Overnight investments |  | 2,063,132 | 1,724,919 |  |
Investment securities available for sale |  | 6,861,293 | 7,171,917 |  |
Investment securities held to maturity |  | 265 | 544 |  |
Loans held for sale |  | 59,766 | 63,696 |  |
Loans and Leases Receivable, Net Amount |  | 19,353,325 | 18,046,497 |  |
FDIC Indemnification Asset | [1] | 4,054 | 18,218 |  |
Income earned not collected |  | 70,036 | 57,254 |  |
Stock issued by Federal Home Loan Bank |  | 37,511 | 39,113 |  |
Servicing Asset |  | 19,495 | 16,736 |  |
Deposits |  | 26,164,472 | 25,164,683 |  |
Short-term borrowings |  | 594,733 | 987,184 |  |
Long-term obligations |  | 718,102 | 367,732 |  |
FDIC loss share payable |  | 131,894 | 122,168 |  |
Accrued interest payable |  | 5,713 | 8,194 |  |
Derivative Liability, Fair Value, Gross Liability |  | $ 1,429 | $ 4,337 |  |
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