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Estimated Fair Values (Estimated Fair Values For Certain Financial Assets And Financial Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and due from banks |  | $ 539,741 | $ 534,086 |  |
Overnight investments |  | 1,872,594 | 2,063,132 |  |
Investment securities available for sale |  | 7,006,580 | 6,861,293 |  |
Investment securities held to maturity |  | 98 | 255 |  |
Net loans and leases |  | 21,519,083 | 20,033,774 |  |
FDIC loss share receivable |  | 4,172 | 4,054 | $ 28,701 | $ 93,397
Income earned not collected |  | 79,839 | 70,036 |  |
Deposits |  | 28,161,343 | 26,930,755 |  |
Short-term borrowings |  | 603,487 | 594,733 |  |
Long-term obligations |  | 832,942 | 704,155 |  |
FDIC shared-loss payable |  | 97,008 | 126,453 |  |
Carrying Value |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and due from banks |  | 539,741 | 534,086 |  |
Overnight investments |  | 1,872,594 | 2,063,132 |  |
Investment securities available for sale |  | 7,006,580 | 6,861,293 |  |
Investment securities held to maturity |  | 98 | 255 |  |
Loans held for sale |  | 74,401 | 59,766 |  |
Net loans and leases |  | 21,519,083 | 20,033,774 |  |
FDIC loss share receivable |  | 4,172 | 4,054 |  |
Income earned not collected |  | 79,839 | 70,036 |  |
Federal Home Loan Bank stock |  | 43,495 | 37,511 |  |
Mortgage servicing assets |  | 20,415 | 19,351 |  |
Deposits |  | 28,161,343 | 26,930,755 |  |
Short-term borrowings |  | 603,487 | 594,733 |  |
Long-term obligations |  | 832,942 | 704,155 |  |
FDIC shared-loss payable |  | 97,008 | 126,453 |  |
Accrued interest payable |  | 3,797 | 5,713 |  |
Interest rate swap | [1] | 0 | 1,429 |  |
Fair Value |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Cash and due from banks |  | 539,741 | 534,086 |  |
Overnight investments |  | 1,872,594 | 2,063,132 |  |
Investment securities available for sale |  | 7,006,580 | 6,861,293 |  |
Investment securities held to maturity |  | 104 | 265 |  |
Loans held for sale |  | 74,401 | 59,766 |  |
Net loans and leases |  | 20,614,548 | 19,353,325 |  |
FDIC loss share receivable |  | 4,172 | 4,054 |  |
Income earned not collected |  | 79,839 | 70,036 |  |
Federal Home Loan Bank stock |  | 43,495 | 37,511 |  |
Mortgage servicing assets |  | 24,446 | 19,495 |  |
Deposits |  | 28,135,698 | 26,164,472 |  |
Short-term borrowings |  | 603,487 | 594,733 |  |
Long-term obligations |  | 832,201 | 718,102 |  |
FDIC shared-loss payable |  | 100,069 | 131,894 |  |
Accrued interest payable |  | 3,797 | 5,713 |  |
Interest rate swap | [1] | $ 0 | $ 1,429 |  |
[1] | The interest rate swap agreement expired in June 2016.

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