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Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Held to maturity securities | $ 2,852,495 | $ 1,565,751
Loans held for sale | 10,843 | 41,022
Derivative financial instruments | 110,734 | 6,908
Derivative Liability | 32,601 | 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 | 888,519 | 4,231,836
Available for sale securities | 5,556,041 | 6,986,698
Held to maturity securities | 2,615,398 | 1,631,482
Loans, net | 22,137,375 | 20,733,821
Loans held for sale | 26,385 | 93,069
Derivative financial instruments | 109,497 | 75,867
Deposits | 29,041,635 | 30,432,646
Federal funds purchased | 1,850 | 1,850
Securities sold under agreements to repurchase | 444,421 | 563,211
Short-term FHLB Borrowings | 1,425,000 | 1,119,026
Long-term debt | 200,060 | 253,677
Derivative Liability | 204,121 | 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 | 888,519 | 4,231,836
Federal funds purchased | 1,850 | 1,850
Securities sold under agreements to repurchase | 444,421 | 563,211
Short-term FHLB Borrowings | 1,425,000 |
Total Fair Value [Member] | Level 2 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available for sale securities | 5,556,041 | 6,986,698
Held to maturity securities | 2,615,398 | 1,631,482
Loans, net | 4,692 | 13,253
Loans held for sale | 26,385 | 93,069
Derivative financial instruments | 109,497 | 75,867
Short-term FHLB Borrowings |  | 1,119,026
Long-term debt | 200,060 | 253,677
Derivative Liability | 202,238 | 30,930
Total Fair Value [Member] | Level 3 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Loans, net | 22,132,683 | 20,720,568
Deposits | 29,041,635 | 30,432,646
Derivative Liability | 1,883 | 4,116
Carrying Amount [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Cash, interest-bearing bank deposits, and federal funds sold | 888,519 | 4,231,836
Available for sale securities | 5,556,041 | 6,986,698
Held to maturity securities | 2,852,495 | 1,565,751
Loans, net | 22,806,257 | 20,792,217
Loans held for sale | 26,385 | 93,069
Derivative financial instruments | 109,497 | 75,867
Deposits | 29,070,349 | 30,465,897
Federal funds purchased | 1,850 | 1,850
Securities sold under agreements to repurchase | 444,421 | 563,211
Short-term FHLB Borrowings | 1,425,000 | 1,100,000
Long-term debt | 242,077 | 244,220
Derivative Liability | $ 204,121 | $ 35,046

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