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Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Available for sale securities | $ 4,893,996 | $ 4,675,304 | $ 4,675,304
Held to maturity securities | 1,480,494 | 1,568,009 |
Derivative financial instruments | 4 | 23 |
Derivative financial instruments | 38,311 | 11,953 |
Total Fair Value [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Cash, interest-bearing bank deposits, and federal funds sold | 1,353,125 | 542,333 |
Available for sale securities | 4,893,996 | 4,675,304 |
Held to maturity securities | 1,562,577 | 1,611,004 |
Loans, net | 21,388,867 | 21,044,079 |
Loans held for sale | 67,587 | 55,864 |
Derivative financial instruments | 166,869 | 54,446 |
Deposits | 25,003,807 | 23,788,775 |
Federal funds purchased | 330,330 | 195,450 |
Securities sold under agreements to repurchase | 482,953 | 484,422 |
FHLB short-term borrowings | 1,860,000 | 2,035,000 |
Long-term debt | 231,044 | 226,098 |
Derivative financial instruments | 49,409 | 21,089 |
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 | 1,353,125 | 542,333 |
Federal funds purchased | 330,330 | 195,450 |
Securities sold under agreements to repurchase | 482,953 | 484,422 |
FHLB short-term borrowings | 1,860,000 | 2,035,000 |
Total Fair Value [Member] | Level 2 [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Available for sale securities | 4,893,996 | 4,675,304 |
Held to maturity securities | 1,562,577 | 1,611,004 |
Loans, net | 281,121 | 182,377 |
Loans held for sale | 67,587 | 55,864 |
Derivative financial instruments | 166,869 | 54,446 |
Long-term debt | 231,044 | 226,098 |
Derivative financial instruments | 44,064 | 15,385 |
Total Fair Value [Member] | Level 3 [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Loans, net | 21,107,746 | 20,861,702 |
Deposits | 25,003,807 | 23,786,775 |
Derivative financial instruments | 5,345 | 5,704 |
Carrying Amount [Member] |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |
Cash, interest-bearing bank deposits, and federal funds sold | 1,353,125 | 542,333 |
Available for sale securities | 4,893,996 | 4,675,304 |
Held to maturity securities | 1,480,494 | 1,568,009 |
Loans, net | 21,089,678 | 21,021,504 |
Loans held for sale | 67,587 | 55,864 |
Derivative financial instruments | 166,869 | 54,446 |
Deposits | 25,008,496 | 23,803,575 |
Federal funds purchased | 330,330 | 195,450 |
Securities sold under agreements to repurchase | 482,953 | 484,422 |
FHLB short-term borrowings | 1,860,000 | 2,035,000 |
Long-term debt | 225,606 | 233,462 |
Derivative financial instruments | $ 49,409 | $ 21,089 |

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