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Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Available for sale securities	$ 7,000,921	$ 5,999,327
Held to maturity securities	1,307,701	1,357,170
Derivative financial instruments	4,911	2,869
Derivative financial instruments	29,105	44,841
Total Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash, interest-bearing bank deposits, and federal funds sold	3,590,661	1,860,092
Available for sale securities	7,000,921	5,999,327
Held to maturity securities	1,385,967	1,467,581
Loans, net	20,544,116	21,533,384
Loans held for sale	90,618	136,063
Derivative financial instruments	98,156	150,180
Deposits	29,177,424	27,679,321
Federal funds purchased	1,825	300
Securities sold under agreements to repurchase	643,403	567,213
FHLB short-term borrowings	1,126,938	1,147,335
Long-term debt	260,964	404,880
Derivative financial instruments	39,708	55,257
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	3,590,661	1,860,092
Federal funds purchased	1,825	300
Securities sold under agreements to repurchase	643,403	567,213
Total Fair Value [Member] | Level 2 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Available for sale securities	7,000,921	5,999,327
Held to maturity securities	1,385,967	1,467,581
Loans, net	17,381	60,451
Loans held for sale	90,618	136,063
Derivative financial instruments	98,156	150,180
FHLB short-term borrowings	1,126,938	1,147,335
Long-term debt	260,964	404,880
Derivative financial instruments	35,236	49,612
Total Fair Value [Member] | Level 3 [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Loans, net	20,526,735	21,472,933
Deposits	29,177,424	27,679,321
Derivative financial instruments	4,472	5,645
Carrying Amount [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash, interest-bearing bank deposits, and federal funds sold	3,590,661	1,860,092
Available for sale securities	7,000,921	5,999,327
Held to maturity securities	1,307,701	1,357,170
Loans, net	20,514,494	21,339,754
Loans held for sale	90,618	136,063
Derivative financial instruments	98,156	150,180
Deposits	29,208,157	27,697,877
Federal funds purchased	1,825	300
Securities sold under agreements to repurchase	643,403	567,213
FHLB short-term borrowings	1,100,000	1,100,000
Long-term debt	248,011	378,322
Derivative financial instruments	$ 39,708	$ 55,257

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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Fair value portion of short term borrowing where a bank borrows, at the federal funds rate, from another bank.

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Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

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Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

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