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Fair Value Measurements (Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Held to maturity securities | $ 2,825,064 | $ 2,852,495
Loans held for sale | 14,923 | 10,843
Derivative assets | 89,182 | 110,734
Derivative liabilities | 85,772 | 32,601
Total Fair Value [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Cash, interest-bearing bank deposits, and federal funds sold | 2,882,521 | 888,519
Available for sale securities | 5,565,620 | 5,556,041
Held to maturity securities | 2,623,760 | 2,615,398
Loans, net | 22,984,009 | 22,137,375
Loans held for sale | 23,436 | 26,385
Derivative assets | 91,945 | 109,497
Deposits | 29,587,071 | 29,041,635
Federal funds purchased | 350 | 1,850
Securities sold under agreements to repurchase | 419,147 | 444,421
FHLB short-term borrowings | 3,100,275 | 1,425,000
Long-term debt | 206,659 | 200,060
Derivative liabilities | 216,201 | 204,121
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 | 2,882,521 | 888,519
Federal funds purchased | 350 | 1,850
Securities sold under agreements to repurchase | 419,147 | 444,421
FHLB short-term 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 | 5,565,620 | 5,556,041
Held to maturity securities | 2,623,760 | 2,615,398
Loans, net | 13,212 | 4,692
Loans held for sale | 23,436 | 26,385
Derivative assets | 91,945 | 109,497
FHLB short-term borrowings | 3,100,275 |
Long-term debt | 206,659 | 200,060
Derivative liabilities | 214,798 | 202,238
Total Fair Value [Member] | Level 3 [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Loans, net | 22,970,797 | 22,132,683
Deposits | 29,587,071 | 29,041,635
Derivative liabilities | 1,403 | 1,883
Carrying Amount [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Cash, interest-bearing bank deposits, and federal funds sold | 2,882,521 | 888,519
Available for sale securities | 5,565,620 | 5,556,041
Held to maturity securities | 2,825,064 | 2,852,495
Loans, net | 23,095,138 | 22,806,257
Loans held for sale | 23,436 | 26,385
Derivative assets | 91,945 | 109,497
Deposits | 29,613,070 | 29,070,349
Federal funds purchased | 350 | 1,850
Securities sold under agreements to repurchase | 419,147 | 444,421
FHLB short-term borrowings | 3,100,000 | 1,425,000
Long-term debt | 242,115 | 242,077
Derivative liabilities | $ 216,201 | $ 204,121

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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