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Estimated Fair Values (Estimated Fair Values For Certain Financial Assets And Financial Liabilities) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and due from banks |  | $ 457,758 | $ 534,086 |  |
Overnight investments |  | 2,871,105 | 2,063,132 |  |
Investment securities available for sale |  | 6,687,289 | 6,861,293 |  |
Investment securities held to maturity |  | 194 | 255 |  |
Loans held for sale |  | 66,988 | 59,766 |  |
Loans and Leases Receivable, Net Amount |  | 20,210,906 | 20,033,774 |  |
FDIC Indemnification Asset |  | 7,474 | 4,054 | $ 21,340 | $ 28,701
Income earned not collected |  | 73,518 | 70,036 |  |
Mortgage servicing rights |  | 17,186 | 19,351 | $ 16,436 | $ 16,688
Deposits |  | 27,365,245 | 26,930,755 |  |
FDIC loss share payable |  | 128,243 | 126,453 |  |
Carrying Value |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and due from banks |  | 457,758 | 534,086 |  |
Overnight investments |  | 2,871,105 | 2,063,132 |  |
Investment securities available for sale |  | 6,687,289 | 6,861,293 |  |
Investment securities held to maturity |  | 194 | 255 |  |
Loans held for sale |  | 66,988 | 59,766 |  |
Loans and Leases Receivable, Net Amount |  | 20,210,906 | 20,033,774 |  |
FDIC Indemnification Asset | [1] | 7,474 | 4,054 |  |
Income earned not collected |  | 73,518 | 70,036 |  |
Stock issued by Federal Home Loan Bank |  | 40,407 | 37,511 |  |
Mortgage servicing rights |  | 17,186 | 19,351 |  |
Deposits |  | 27,365,245 | 26,930,755 |  |
Short-term borrowings |  | 689,236 | 594,733 |  |
Long-term obligations |  | 779,087 | 704,155 |  |
FDIC loss share payable |  | 128,243 | 126,453 |  |
Accrued interest payable |  | 6,037 | 5,713 |  |
Interest rate swap |  | 729 | 1,429 |  |
Fair Value |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and due from banks |  | 457,758 | 534,086 |  |
Overnight investments |  | 2,871,105 | 2,063,132 |  |
Investment securities available for sale |  | 6,687,289 | 6,861,293 |  |
Investment securities held to maturity |  | 203 | 265 |  |
Loans held for sale |  | 66,988 | 59,766 |  |
Loans and Leases Receivable, Net Amount |  | 19,703,240 | 19,353,325 |  |
FDIC Indemnification Asset | [1] | 7,474 | 4,054 |  |
Income earned not collected |  | 73,518 | 70,036 |  |
Stock issued by Federal Home Loan Bank |  | 40,407 | 37,511 |  |
Mortgage servicing rights |  | 17,234 | 19,495 |  |
Deposits |  | 26,904,946 | 26,164,472 |  |
Short-term borrowings |  | 689,236 | 594,733 |  |
Long-term obligations |  | 808,765 | 718,102 |  |
FDIC loss share payable |  | 136,646 | 131,894 |  |
Accrued interest payable |  | 6,037 | 5,713 |  |
Interest rate swap |  | $ 729 | $ 1,429 |  |
[1] | (1) At March 31, 2016 and December 31, 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.

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