Fair Value Measurements Details of Book Value and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Available for sale investment securities	$ 2,488,699	$ 2,559,227
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Cash and due from banks	94,938	118,763
Interest-bearing deposits with other banks	322,514	233,763
Federal Reserve Bank and Federal Home Loan Bank stock	70,328	57,489
Loans held for sale	62,354	28,697
Available for sale investment securities	2,488,699	2,559,227
Net Loans	15,174,275	14,530,593
Accrued interest receivable	47,603	46,294
Other financial assets	212,773	206,132
Demand and savings deposits	12,610,951	12,259,622
Time deposits	2,746,410	2,753,242
Short-term borrowings	694,859	541,317
Accrued interest payable	7,804	9,632
Other financial liabilities	252,537	216,080
Federal Home Loan Bank advances and other long-term debt	1,037,961	929,403
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Cash and due from banks	94,938	118,763
Interest-bearing deposits with other banks	322,514	233,763
Federal Reserve Bank and Federal Home Loan Bank stock	70,328	57,489
Loans held for sale	62,354	28,697
Available for sale investment securities	2,488,699	2,559,227
Net Loans	15,007,961	14,387,454
Accrued interest receivable	47,603	46,294
Other financial assets	212,773	206,132
Demand and savings deposits	12,610,951	12,259,622
Time deposits	2,758,807	2,769,757
Short-term borrowings	694,859	541,317
Accrued interest payable	7,804	9,632
Other financial liabilities	252,537	216,080
Federal Home Loan Bank advances and other long-term debt	$ 1,035,711	$ 928,167

Demand and Savings Deposit Liabilities, Fair Value Disclosure

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- Definition

Federal Home Loan Bank Advances And Debt Long Term, Fair Value Disclosre

+ References

No definition available.

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- Definition

Interest-Rate Deposits with Other Banks, Fair Value Disclosure

+ References

No definition available.

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- Definition

Interest Receivable, Fair Value Disclosure

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No definition available.

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- Definition

Other financial liabilities – Included within this category are: Level 1 employee deferred compensation liabilities which represent amounts due to employees under the deferred compensation plans, described under the heading “Other financial assets” above and Level 2 mortgage banking derivatives, described under the heading “Other financial assets” above.

+ References

No definition available.

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- Definition

Time Deposit Liabilities, Fair Value Disclosure

+ References

No definition available.

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- Definition

Fair value portion of trade and related party payables and accrued expenses.

+ References

No definition available.

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=29638263&loc=d3e39828-111592

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- Definition

Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

+ References

No definition available.

+ Details

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- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Glossary Loan
-URI http://asc.fasb.org/extlink&oid=6517073

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- Definition

Fair value portion of other assets.

+ References

No definition available.

+ Details

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.

+ References

No definition available.

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