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Estimated Fair Values (Estimated Fair Values For Certain Financial Assets And Financial Liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Cash and due from banks | $ 262,525 |  | $ 336,150 |  |  |
Overnight investments | 943,025 |  | 1,387,927 |  |  |
Investment securities available for sale | 4,677,351 |  | 7,180,180 |  |  |
Investment securities held to maturity | 2,253,416 |  | 76 |  |  |
Investment in marketable equity securities | 109,907 |  | 0 |  |  |
Loans held for sale | 46,082 |  | 51,179 |  |  |
Loans and Leases Receivable, Net Amount | 24,667,150 |  | 23,374,932 |  |  |
Income earned not collected | 105,616 |  | 95,249 |  |  |
Mortgage servicing rights | 21,633 | $ 21,657 | 21,945 | $ 22,003 | $ 20,524 | $ 20,415
Deposits | 30,163,537 |  | 29,266,275 |  |  |
FDIC shared-loss payable | 104,576 | $ 103,487 | 101,342 | $ 100,203 | $ 99,126 | $ 97,008
Carrying Value |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Cash and due from banks | 262,525 |  | 336,150 |  |  |
Overnight investments | 943,025 |  | 1,387,927 |  |  |
Investment securities available for sale | 4,677,351 |  | 7,180,180 |  |  |
Investment securities held to maturity | 2,253,416 |  | 76 |  |  |
Investment in marketable equity securities | 109,907 |  | 0 |  |  |
Loans held for sale | 46,082 |  | 51,179 |  |  |
Loans and Leases Receivable, Net Amount | 24,667,150 |  | 23,374,932 |  |  |
Income earned not collected | 105,616 |  | 95,249 |  |  |
Stock issued by Federal Home Loan Bank | 28,438 |  | 52,685 |  |  |
Mortgage servicing rights | 21,633 |  | 21,945 |  |  |
Deposits | 30,163,537 |  | 29,266,275 |  |  |
Short-term borrowings | 687,749 |  | 693,807 |  |  |
Long-term obligations | 297,487 |  | 870,240 |  |  |
FDIC shared-loss payable | 104,576 |  | 101,342 |  |  |
Accrued interest payable | 2,400 |  | 3,952 |  |  |
Fair Value |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Cash and due from banks | 262,525 |  | 336,150 |  |  |
Overnight investments | 943,025 |  | 1,387,927 |  |  |
Investment securities available for sale | 4,677,351 |  | 7,180,180 |  |  |
Investment securities held to maturity | 2,238,664 |  | 81 |  |  |
Investment in marketable equity securities | 109,907 |  | 0 |  |  |
Loans held for sale | 46,082 |  | 51,179 |  |  |
Loans and Leases Receivable, Net Amount | 23,955,732 |  | 22,257,803 |  |  |
Income earned not collected | 105,616 |  | 95,249 |  |  |
Stock issued by Federal Home Loan Bank | 28,438 |  | 52,685 |  |  |
Mortgage servicing rights | 28,829 |  | 26,170 |  |  |
Deposits | 30,115,380 |  | 29,230,768 |  |  |
Short-term borrowings | 687,749 |  | 693,807 |  |  |
Long-term obligations | 303,935 |  | 852,112 |  |  |
FDIC shared-loss payable | 104,615 |  | 102,684 |  |  |
Accrued interest payable | $ 2,400 |  | $ 3,952 |  |  |

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