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Estimated Fair Values (Estimated Fair Values For Certain Financial Assets And Financial Liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | --- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |
Cash and due from banks |  | $ 495,705 |  | $ 534,086 |  |  |
Overnight investments |  | 2,997,086 |  | 2,063,132 |  |  |
Investment securities available for sale |  | 6,384,815 |  | 6,861,293 |  |  |
Investment securities held to maturity |  | 125 |  | 255 |  |  |
Loans held for sale |  | 95,910 |  | 59,766 |  |  |
Loans and Leases Receivable, Net Amount |  | 21,085,030 |  | 20,033,774 |  |  |
FDIC Indemnification Asset |  | 3,108 | $ 5,281 | 4,054 | $ 9,276 | $ 5,808 | $ 28,701
Income earned not collected |  | 74,933 |  | 70,036 |  |  |
Mortgage servicing rights |  | 17,730 | $ 16,824 | 19,351 | $ 19,327 | $ 18,162 | $ 16,688
Deposits |  | 27,925,253 |  | 26,930,755 |  |  |
FDIC loss share payable |  | 95,779 |  | 126,453 |  |  |
Carrying Value |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |
Cash and due from banks |  | 495,705 |  | 534,086 |  |  |
Overnight investments |  | 2,997,086 |  | 2,063,132 |  |  |
Investment securities available for sale |  | 6,384,815 |  | 6,861,293 |  |  |
Investment securities held to maturity |  | 125 |  | 255 |  |  |
Loans held for sale |  | 95,910 |  | 59,766 |  |  |
Loans and Leases Receivable, Net Amount |  | 21,085,030 |  | 20,033,774 |  |  |
FDIC Indemnification Asset | [1] | 3,108 |  | 4,054 |  |  |
Income earned not collected |  | 74,933 |  | 70,036 |  |  |
Stock issued by Federal Home Loan Bank |  | 43,495 |  | 37,511 |  |  |
Mortgage servicing rights |  | 17,730 |  | 19,351 |  |  |
Deposits |  | 27,925,253 |  | 26,930,755 |  |  |
Short-term borrowings |  | 730,214 |  | 594,733 |  |  |
Long-term obligations |  | 840,266 |  | 704,155 |  |  |
FDIC loss share payable |  | 95,779 |  | 126,453 |  |  |
Accrued interest payable |  | 4,051 |  | 5,713 |  |  |
Interest rate swap |  | 0 |  | 1,429 |  |  |
Fair Value |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |
Cash and due from banks |  | 495,705 |  | 534,086 |  |  |
Overnight investments |  | 2,997,086 |  | 2,063,132 |  |  |
Investment securities available for sale |  | 6,384,815 |  | 6,861,293 |  |  |
Investment securities held to maturity |  | 133 |  | 265 |  |  |
Loans held for sale |  | 95,910 |  | 59,766 |  |  |
Loans and Leases Receivable, Net Amount |  | 20,531,249 |  | 19,353,325 |  |  |
FDIC Indemnification Asset | [1] | 3,108 |  | 4,054 |  |  |
Income earned not collected |  | 74,933 |  | 70,036 |  |  |
Stock issued by Federal Home Loan Bank |  | 43,495 |  | 37,511 |  |  |
Mortgage servicing rights |  | 17,965 |  | 19,495 |  |  |
Deposits |  | 27,913,775 |  | 26,164,472 |  |  |
Short-term borrowings |  | 730,214 |  | 594,733 |  |  |
Long-term obligations |  | 870,386 |  | 718,102 |  |  |
FDIC loss share payable |  | 101,117 |  | 131,894 |  |  |
Accrued interest payable |  | 4,051 |  | 5,713 |  |  |
Interest rate swap |  | $ 0 |  | $ 1,429 |  |  |
[1] | (1) The interest rate swap agreement expired in June 2016.

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