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Fair Value (Estimated Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Available for sale securities |  | $ 2,308,812 | $ 2,093,404
Held to maturity securities |  | 2,497,558 | 2,370,388
Derivative financial instruments | [1] | 43,903 | 23,251
Derivative financial instruments | [1] | 43,184 | 23,968
Total Fair Value [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Cash, interest-bearing bank deposits, and federal funds sold |  | 466,587 | 869,429
Available for sale securities |  | 2,308,812 | 2,093,404
Held to maturity securities |  | 2,569,084 | 2,375,851
Loans, net |  | 16,174,870 | 15,427,803
Loans held for sale |  | 42,297 | 20,434
Derivative financial instruments |  | 43,903 | 23,251
Deposits |  | 18,837,146 | 18,327,425
Federal funds purchased |  | 10,575 | 10,100
Securities sold under agreements to repurchase |  | 409,532 | 513,544
FHLB borrowings |  | 675,000 | 900,000
Long-term debt |  | 474,888 | 488,711
Derivative financial instruments |  | 43,184 | 23,968
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 |  | 466,587 | 869,429
Available for sale securities |  | 1,212 | 2,757
Federal funds purchased |  | 10,575 | 10,100
Securities sold under agreements to repurchase |  | 409,532 | 513,544
FHLB borrowings |  | 675,000 | 900,000
Total Fair Value [Member] | Level 2 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Available for sale securities |  | 2,307,600 | 2,090,647
Held to maturity securities |  | 2,569,084 | 2,375,851
Loans, net |  | 116,516 | 93,602
Loans held for sale |  | 42,297 | 20,434
Derivative financial instruments |  | 43,903 | 23,251
Long-term debt |  | 474,888 | 488,711
Derivative financial instruments |  | 43,184 | 23,968
Total Fair Value [Member] | Level 3 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Loans, net |  | 16,058,354 | 15,334,201
Deposits |  | 18,837,146 | 18,327,425
Carrying Amount [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Cash, interest-bearing bank deposits, and federal funds sold |  | 466,587 | 869,429
Available for sale securities |  | 2,308,812 | 2,093,404
Held to maturity securities |  | 2,497,558 | 2,370,388
Loans, net |  | 15,809,710 | 15,522,135
Loans held for sale |  | 42,297 | 20,434
Derivative financial instruments |  | 43,903 | 23,251
Deposits |  | 18,816,869 | 18,348,912
Federal funds purchased |  | 10,575 | 10,100
Securities sold under agreements to repurchase |  | 409,532 | 513,544
FHLB borrowings |  | 675,000 | 900,000
Long-term debt |  | 468,028 | 490,145
Derivative financial instruments |  | $ 43,184 | $ 23,968
[1] | For further disaggregation of derivative assets and liabilities, see Note 6 - Derivatives.

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + 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://www.xbrl.org/2003/role/presentationRef -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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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