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Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Held to maturity securities | $ 2,866,348 | $ 1,565,751
Loans held for sale | 15,149 | 41,022
Derivative financial instruments | 114,680 | 6,908
Derivative financial instruments | 37,879 | 22,244
Total Fair Value [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Cash, interest-bearing bank deposits, and federal funds sold | 851,251 | 4,231,836
Available for sale securities | 5,466,843 | 6,986,698
Held to maturity securities | 2,606,080 | 1,631,482
Loans, net | 21,461,955 | 20,733,821
Loans held for sale | 33,008 | 93,069
Derivative financial instruments | 119,100 | 75,867
Deposits | 28,925,735 | 30,432,646
Federal funds purchased | 1,850 | 1,850
Securities sold under agreements to repurchase | 541,131 | 563,211
FHLB short-term borrowings | 1,000,000 | 1,119,026
Long-term debt | 197,059 | 253,677
Derivative financial instruments | 226,438 | 35,046
Total Fair Value [Member] | Level 1 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Cash, interest-bearing bank deposits, and federal funds sold | 851,251 | 4,231,836
Federal funds purchased | 1,850 | 1,850
Securities sold under agreements to repurchase | 541,131 | 563,211
FHLB short-term borrowings | 1,000,000 |
Total Fair Value [Member] | Level 2 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available for sale securities | 5,466,843 | 6,986,698
Held to maturity securities | 2,606,080 | 1,631,482
Loans, net | 4,756 | 13,253
Loans held for sale | 33,008 | 93,069
Derivative financial instruments | 119,100 | 75,867
FHLB short-term borrowings |  | 1,119,026
Long-term debt | 197,059 | 253,677
Derivative financial instruments | 224,143 | 30,930
Total Fair Value [Member] | Level 3 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Loans, net | 21,457,199 | 20,720,568
Deposits | 28,925,735 | 30,432,646
Derivative financial instruments | 2,295 | 4,116
Carrying Amount [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Cash, interest-bearing bank deposits, and federal funds sold | 851,251 | 4,231,836
Available for sale securities | 5,466,843 | 6,986,698
Held to maturity securities | 2,866,348 | 1,565,751
Loans, net | 22,279,469 | 20,792,217
Loans held for sale | 33,008 | 93,069
Derivative financial instruments | 119,100 | 75,867
Deposits | 28,951,274 | 30,465,897
Federal funds purchased | 1,850 | 1,850
Securities sold under agreements to repurchase | 541,131 | 563,211
FHLB short-term borrowings | 1,000,000 | 1,100,000
Long-term debt | 236,410 | 244,220
Derivative financial instruments | $ 226,438 | $ 35,046

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