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Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available for sale securities | $ 5,647,315 | $ 4,675,304
Held to maturity securities | 1,408,961 | 1,568,009
Derivative financial instruments |  | 23
Derivative financial instruments | 47,042 | 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 | 1,263,372 | 542,333
Available for sale securities | 5,647,315 | 4,675,304
Held to maturity securities | 1,517,688 | 1,611,004
Loans, net | 22,062,765 | 21,044,079
Loans held for sale | 103,566 | 55,864
Derivative financial instruments | 168,822 | 54,446
Deposits | 27,017,416 | 23,786,775
Federal funds purchased | 250 | 195,450
Securities sold under agreements to repurchase | 806,645 | 484,422
FHLB short-term borrowings | 1,161,666 | 2,035,000
Long-term debt | 434,597 | 226,098
Derivative financial instruments | 56,278 | 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 | 1,263,372 | 542,333
Federal funds purchased | 250 | 195,450
Securities sold under agreements to repurchase | 806,645 | 484,422
FHLB short-term borrowings |  | 2,035,000
Total Fair Value [Member] | Level 2 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Available for sale securities | 5,647,315 | 4,675,304
Held to maturity securities | 1,517,688 | 1,611,004
Loans, net | 91,819 | 182,377
Loans held for sale | 103,566 | 55,864
Derivative financial instruments | 168,822 | 54,446
FHLB short-term borrowings | 1,161,666 |
Long-term debt | 434,597 | 226,098
Derivative financial instruments | 51,662 | 15,385
Total Fair Value [Member] | Level 3 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Loans, net | 21,970,946 | 20,861,702
Deposits | 27,017,416 | 23,786,775
Derivative financial instruments | 4,616 | 5,704
Carrying Amount [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Cash, interest-bearing bank deposits, and federal funds sold | 1,263,372 | 542,333
Available for sale securities | 5,647,315 | 4,675,304
Held to maturity securities | 1,408,961 | 1,568,009
Loans, net | 21,791,530 | 21,021,504
Loans held for sale | 103,566 | 55,864
Derivative financial instruments | 168,822 | 54,446
Deposits | 27,030,659 | 23,803,575
Federal funds purchased | 250 | 195,450
Securities sold under agreements to repurchase | 806,645 | 484,422
FHLB short-term borrowings | 1,100,000 | 2,035,000
Long-term debt | 385,887 | 233,462
Derivative financial instruments | $ 56,278 | $ 21,089

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- Definition 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. + References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
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- Definition Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
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