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Estimated Fair Values (Estimated Fair Values For Certain Financial Assets And Financial Liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | --- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |
Cash and due from banks |  | $ 546,444 |  | $ 604,182 |  |  |
Overnight investments |  | 2,368,132 |  | 1,724,919 |  |  |
Investment securities available for sale |  | 6,690,578 |  | 7,171,917 |  |  |
Investment securities held to maturity |  | 301 |  | 518 |  |  |
Loans held for sale |  | 71,874 |  | 63,696 |  |  |
Loans and Leases Receivable, Net Amount |  | 19,650,343 |  | 18,564,999 |  |  |
FDIC Indemnification Asset |  | 9,276 | $ 5,808 | 28,701 | $ 45,140 | $ 49,959 | $ 93,397
Income earned not collected |  | 67,368 |  | 57,254 |  |  |
Mortgage servicing rights |  | 19,327 | $ 18,162 | 16,688 | $ 0 | $ 0 | $ 16
Deposits |  | 26,719,375 |  | 25,678,577 |  |  |
FDIC loss share payable |  | 124,038 |  | 116,535 |  |  |
Carrying Value |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |
Cash and due from banks |  | 546,444 |  | 604,182 |  |  |
Overnight investments |  | 2,368,132 |  | 1,724,919 |  |  |
Investment securities available for sale |  | 6,690,578 |  | 7,171,917 |  |  |
Investment securities held to maturity |  | 301 |  | 518 |  |  |
Loans held for sale |  | 71,874 |  | 63,696 |  |  |
Loans and Leases Receivable, Net Amount |  | 19,650,343 |  | 18,564,999 |  |  |
FDIC Indemnification Asset | [1] | 9,276 |  | 28,701 |  |  |
Income earned not collected |  | 67,368 |  | 57,254 |  |  |
Stock issued by Federal Home Loan Bank |  | 37,511 |  | 39,113 |  |  |
Mortgage servicing rights |  | 19,327 |  | 16,688 |  |  |
Deposits |  | 26,719,375 |  | 25,678,577 |  |  |
Short-term borrowings |  | 759,757 |  | 987,184 |  |  |
Long-term obligations |  | 705,418 |  | 351,320 |  |  |
FDIC loss share payable |  | 124,038 |  | 116,535 |  |  |
Accrued interest payable |  | 5,950 |  | 8,194 |  |  |
Interest rate swap |  | 2,331 |  | 4,337 |  |  |
Fair Value |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |
Cash and due from banks |  | 546,444 |  | 604,182 |  |  |
Overnight investments |  | 2,368,132 |  | 1,724,919 |  |  |
Investment securities available for sale |  | 6,690,578 |  | 7,171,917 |  |  |
Investment securities held to maturity |  | 314 |  | 544 |  |  |
Loans held for sale |  | 71,874 |  | 63,696 |  |  |
Loans and Leases Receivable, Net Amount |  | 19,038,274 |  | 18,046,497 |  |  |
FDIC Indemnification Asset | [1] | 9,276 |  | 18,218 |  |  |
Income earned not collected |  | 67,368 |  | 57,254 |  |  |
Stock issued by Federal Home Loan Bank |  | 37,511 |  | 39,113 |  |  |
Mortgage servicing rights |  | 22,358 |  | 16,736 |  |  |
Deposits |  | 26,050,802 |  | 25,164,683 |  |  |
Short-term borrowings |  | 759,757 |  | 987,184 |  |  |
Long-term obligations |  | 722,180 |  | 367,732 |  |  |
FDIC loss share payable |  | 131,711 |  | 122,168 |  |  |
Accrued interest payable |  | 5,950 |  | 8,194 |  |  |
Interest rate swap |  | $ 2,331 |  | $ 4,337 |  |  |
[1] | (1) At September 30, 2015, the carrying value of the FDIC receivable approximates the fair value due to the short term nature of the majority of loss share agreements. At December 31, 2014, the fair value of the FDIC receivable is estimated based on discounted future cash flows using current discount rates and excludes receivable related to accretable yield to be amortized in prospective periods.

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