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Estimated Fair Values (Estimated Fair Values For Certain Financial Assets And Financial Liabilities) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and due from banks | $ 268,599 | $ 327,440 |  |
Overnight investments | 1,386,525 | 797,406 |  |
Investment securities held to maturity | 2,214,829 | 2,184,653 |  |
Investment in marketable equity securities | 109,884 | 92,599 |  |
Loans held for sale | 53,232 | 45,505 |  |
Loans and Leases Receivable, Net Amount | 25,235,010 | 25,299,564 |  |
Income earned not collected | 113,812 | 109,903 |  |
Mortgage servicing rights | 20,647 | 21,396 | $ 21,659 | $ 21,945
Deposits | 31,198,093 | 30,672,460 |  |
Securities sold under customer repurchase agreements | 508,508 | 543,936 |  |
Federal Home Loan Bank borrowings | 189,594 | 193,556 |  |
FDIC shared-loss payable | 107,256 | 105,618 |  |
Carrying Value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and due from banks | 268,599 | 327,440 |  |
Overnight investments | 1,386,525 | 797,406 |  |
Debt Securities, Available-for-sale | 4,589,800 | 4,557,110 |  |
Investment securities held to maturity | 2,214,829 | 2,184,653 |  |
Investment in marketable equity securities | 109,884 | 92,599 |  |
Loans held for sale | 53,232 | 45,505 |  |
Loans and Leases Receivable, Net Amount | 25,235,010 | 25,299,564 |  |
Income earned not collected | 113,812 | 109,903 |  |
Stock issued by Federal Home Loan Bank | 25,174 | 25,304 |  |
Mortgage servicing rights | 24,080 | 24,615 |  |
Deposits | 31,198,093 | 30,672,460 |  |
Securities sold under customer repurchase agreements | 508,508 | 543,936 |  |
Federal Home Loan Bank borrowings | 189,594 | 193,556 |  |
Short-term borrowings | 136,544 | 140,741 |  |
Long-term obligations | 14,970 | 13,921 |  |
FDIC shared-loss payable | 107,256 | 105,618 |  |
Accrued interest payable | 7,169 | 3,712 |  |
Fair Value |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Cash and due from banks | 268,599 | 327,440 |  |
Overnight investments | 1,386,525 | 797,406 |  |
Debt Securities, Available-for-sale | 4,589,800 | 4,557,110 |  |
Investment securities held to maturity | 2,254,924 | 2,201,502 |  |
Investment in marketable equity securities | 109,884 | 92,599 |  |
Loans held for sale | 53,232 | 45,505 |  |
Loans and Leases Receivable, Net Amount | 25,187,938 | 24,845,060 |  |
Income earned not collected | 113,812 | 109,903 |  |
Stock issued by Federal Home Loan Bank | 25,174 | 25,304 |  |
Mortgage servicing rights | 25,769 | 27,435 |  |
Deposits | 31,174,142 | 30,623,214 |  |
Securities sold under customer repurchase agreements | 508,508 | 543,936 |  |
Federal Home Loan Bank borrowings | 192,779 | 195,374 |  |
Short-term borrowings | 140,676 | 151,670 |  |
Long-term obligations | 14,833 | 13,985 |  |
FDIC shared-loss payable | 109,947 | 105,846 |  |
Accrued interest payable | $ 7,169 | $ 3,712 |  |

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