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Estimated Fair Values (Estimated Fair Values For Certain Financial Assets And Financial Liabilities) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and due from banks | $ 337,450 | $ 362,048
Debt Securities, Available-for-sale | 7,371,129 | 7,014,243
Investment securities held to maturity at cost | 3,381,078 | 2,816,982
Investment in marketable equity securities | 123,147 | 91,680
Loans held for sale | 98,500 | 124,800
Loans and Leases Receivable, Net Amount | 32,332,995 | 32,567,661
Income earned not collected | 132,911 | 145,694
Stock issued by Federal Home Loan Bank | 40,500 | 45,400
Deposits | 50,065,762 | 43,431,609
Securities sold under customer repurchase agreements | 663,575 | 641,487
FDIC shared-loss payable | 0 | 15,601
Subordinated Debt | 497,427 | 504,518
Other Borrowings | 76,139 | 88,470
Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Federal Home Loan Bank Advances | 645,663 | 655,175
Cash and due from banks | 337,450 | 362,048
Overnight investments | 9,875,063 | 4,347,336
Debt Securities, Available-for-sale | 7,371,129 | 7,014,243
Investment securities held to maturity at cost | 3,381,078 | 2,816,982
Investment in marketable equity securities | 123,147 | 91,680
Loans held for sale | 98,451 | 124,837
Loans and Leases Receivable, Net Amount | 32,332,995 | 32,567,661
Income earned not collected | 132,911 | 145,694
Stock issued by Federal Home Loan Bank | 40,450 | 45,392
Mortgage servicing rights | 22,263 | 19,628
Deposits | 47,492,194 | 40,542,596
Time deposits | 2,573,568 | 2,889,013
Securities sold under customer repurchase agreements | 663,575 | 641,487
FDIC shared-loss payable | 0 | 15,601
Accrued interest payable | 6,560 | 9,414
Subordinated Debt | 497,427 | 504,518
Other Borrowings | 76,139 | 88,470
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Federal Home Loan Bank Advances | 659,625 | 677,579
Cash and due from banks | 337,450 | 362,048
Overnight investments | 9,875,063 | 4,347,336
Debt Securities, Available-for-sale | 7,371,129 | 7,014,243
Investment securities held to maturity at cost | 3,353,078 | 2,838,499
Investment in marketable equity securities | 123,147 | 91,680
Loans held for sale | 98,451 | 124,837
Loans and Leases Receivable, Net Amount | 32,349,172 | 33,298,166
Income earned not collected | 132,911 | 145,694
Stock issued by Federal Home Loan Bank | 40,450 | 45,392
Mortgage servicing rights | 22,624 | 20,283
Deposits | 47,492,194 | 40,542,596
Time deposits | 2,573,131 | 2,905,577
Securities sold under customer repurchase agreements | 663,575 | 641,487
FDIC shared-loss payable | 0 | 15,843
Accrued interest payable | 6,560 | 9,414
Subordinated Debt | 520,871 | 525,610
Other Borrowings | $ 76,643 | $ 89,263

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