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Estimated Fair Values (Estimated Fair Values For Certain Financial Assets And Financial Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Cash and due from banks | $ 327,440 | $ 336,150 |
Overnight investments | 797,406 | 1,387,927 |
Investment securities available for sale | 4,557,110 | 7,180,180 |
Investment securities held to maturity | 2,184,653 | 76 |
Investment in marketable equity securities | 92,599 | 0 |
Net loans and leases | 25,299,564 | 23,374,932 |
Income earned not collected | 109,903 | 95,249 |
Preferred stock | 0 | 0 |
Deposits | 30,672,460 | 29,266,275 |
Short-term borrowings | 572,287 | 693,807 |
Long-term obligations | 319,867 | 870,240 |
FDIC shared-loss payable | 105,618 | 101,342 | $ 97,008
Carrying Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Cash and due from banks | 327,440 | 336,150 |
Overnight investments | 797,406 | 1,387,927 |
Investment securities available for sale | 4,557,110 | 7,180,180 |
Investment securities held to maturity | 2,184,653 | 76 |
Investment in marketable equity securities | 92,599 | 0 |
Loans held for sale | 45,505 | 51,179 |
Net loans and leases | 25,299,564 | 23,374,932 |
Income earned not collected | 109,903 | 95,249 |
Federal Home Loan Bank stock | 25,304 | 52,685 |
Mortgage servicing assets | 24,066 | 21,945 |
Deposits | 30,672,460 | 29,266,275 |
Short-term borrowings | 572,287 | 693,807 |
Long-term obligations | 319,867 | 870,240 |
FDIC shared-loss payable | 105,618 | 101,342 |
Accrued interest payable | 3,712 | 3,952 |
Fair Value |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Cash and due from banks | 327,440 | 336,150 |
Overnight investments | 797,406 | 1,387,927 |
Investment securities available for sale | 4,557,110 | 7,180,180 |
Investment securities held to maturity | 2,201,502 | 81 |
Investment in marketable equity securities | 92,599 | 0 |
Loans held for sale | 45,505 | 51,179 |
Net loans and leases | 24,845,060 | 22,257,803 |
Income earned not collected | 109,903 | 95,249 |
Federal Home Loan Bank stock | 25,304 | 52,685 |
Mortgage servicing assets | 29,532 | 26,170 |
Deposits | 30,623,214 | 29,230,768 |
Short-term borrowings | 572,287 | 693,807 |
Long-term obligations | 332,678 | 852,112 |
FDIC shared-loss payable | 105,846 | 102,684 |
Accrued interest payable | $ 3,712 | $ 3,952 |

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