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Estimated Fair Values (Estimated Fair Values For Certain Financial Assets And Financial Liabilities) (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Cash and due from banks | $ 395,364 | $ 362,048
Overnight investments | 7,871,382 | 4,347,336
Debt Securities, Available-for-sale | 7,381,083 | 7,014,243
Investment securities held to maturity at cost | 3,394,604 | 2,816,982
Investment in marketable equity securities | 118,540 | 91,680
Loans held for sale | 107,800 | 124,800
Loans and Leases Receivable, Net Amount | 32,500,558 | 32,567,661
Income earned not collected | 133,043 | 145,694
Stock issued by Federal Home Loan Bank | 40,500 | 45,400
Deposits | 48,410,596 | 43,431,609
Securities sold under customer repurchase agreements | 692,604 | 641,487
FDIC shared-loss payable | 0 | 15,601
Subordinated Debt | 497,290 | 504,518
Other Borrowings | 80,531 | 88,470
Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Federal Home Loan Bank Advances | 646,667 | 655,175
Cash and due from banks | 395,364 | 362,048
Overnight investments | 7,871,382 | 4,347,336
Debt Securities, Available-for-sale | 7,381,083 | 7,014,243
Investment securities held to maturity at cost | 3,394,604 | 2,816,982
Investment in marketable equity securities | 118,540 | 91,680
Loans held for sale | 107,768 | 124,837
Loans and Leases Receivable, Net Amount | 32,500,558 | 32,567,661
Income earned not collected | 133,043 | 145,694
Stock issued by Federal Home Loan Bank | 40,450 | 45,392
Mortgage servicing rights | 22,702 | 19,628
Deposits | 45,789,354 | 40,542,596
Time deposits | 2,621,242 | 2,889,013
Securities sold under customer repurchase agreements | 692,604 | 641,487
FDIC shared-loss payable | 0 | 15,601
Accrued interest payable | 8,811 | 9,414
Subordinated Debt | 497,290 | 504,518
Other Borrowings | 80,531 | 88,470
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Federal Home Loan Bank Advances | 662,606 | 677,579
Cash and due from banks | 395,364 | 362,048
Overnight investments | 7,871,382 | 4,347,336
Debt Securities, Available-for-sale | 7,381,083 | 7,014,243
Investment securities held to maturity at cost | 3,377,085 | 2,838,499
Investment in marketable equity securities | 118,540 | 91,680
Loans held for sale | 107,768 | 124,837
Loans and Leases Receivable, Net Amount | 32,786,935 | 33,298,166
Income earned not collected | 133,043 | 145,694
Stock issued by Federal Home Loan Bank | 40,450 | 45,392
Mortgage servicing rights | 23,155 | 20,283
Deposits | 45,789,354 | 40,542,596
Time deposits | 2,626,322 | 2,905,577
Securities sold under customer repurchase agreements | 692,604 | 641,487
FDIC shared-loss payable | 0 | 15,843
Accrued interest payable | 8,811 | 9,414
Subordinated Debt | 523,423 | 525,610
Other Borrowings | $ 81,201 | $ 89,263

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