Fair Value Measurements Details of Book Value and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Securities available for sale	$ 2,547,956	$ 2,559,227
FHLB advances and long-term debt (5)	1,038,346	929,403
Book Value
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Loans held for sale	31,530	28,697
Loans, net of unearned income	15,598,337	14,530,593
Accrued interest receivable (1)	52,910	46,294
Short-term borrowings (1)	617,524	541,317
Accrued interest payable (1)	9,317	9,632
FHLB advances and long-term debt (5)	1,038,346	929,403
Book Value \| Cash and due from banks (1)
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Cash and due from banks (1)	108,291	118,763
Book Value \| Interest-bearing Deposits
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Interest-bearing deposits with other banks (1)	293,805	233,763
FRB and FHLB stock (2)	60,761	57,489
Book Value \| Available-for-sale Securities
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Securities available for sale	2,547,956	2,559,227
Book Value \| Other Assets
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Other financial assets	215,464	206,132
Book Value \| Deposits
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Demand and savings deposits (1)	13,042,147	12,259,622
Brokered Deposit Liabilities, Fair Value Disclosure	90,473	0
Time deposits (5)	2,664,912	2,753,242
Book Value \| Other financial liabilities
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Other financial liabilities	227,569	216,080
Estimated Fair Value
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Loans held for sale	31,530	28,697
Loans, net of unearned income	15,380,974	14,387,454
Accrued interest receivable (1)	52,910	46,294
Short-term borrowings (1)	617,524	541,317
Accrued interest payable (1)	9,317	9,632
FHLB advances and long-term debt (5)	1,025,640	928,167
Estimated Fair Value \| Cash and due from banks (1)
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Cash and due from banks (1)	108,291	118,763
Estimated Fair Value \| Interest-bearing Deposits
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Interest-bearing deposits with other banks (1)	293,805	233,763
FRB and FHLB stock (2)	60,761	57,489
Estimated Fair Value \| Available-for-sale Securities
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Securities available for sale	2,547,956	2,559,227
Estimated Fair Value \| Other Assets
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Other financial assets	215,464	206,132
Estimated Fair Value \| Deposits
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Demand and savings deposits (1)	13,042,147	12,259,622
Brokered Deposit Liabilities, Fair Value Disclosure	90,473	0
Time deposits (5)	2,673,359	2,769,757
Estimated Fair Value \| Other financial liabilities
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]
Other financial liabilities	$ 227,569	$ 216,080

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Demand And Savings Deposits, Fair Value Disclosure

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Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer. Also including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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Interest-Rate Deposits with Other Banks, Fair Value Disclosure

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Interest Receivable, Fair Value Disclosure

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Loans, Net Of Deferred Income, Fair Value Disclosure

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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.

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Time Deposits, Fair Value Disclosure

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

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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=75030427&loc=d3e22054-111558

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
-Paragraph 5
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562

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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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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.

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

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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=75030709&loc=d3e39828-111592

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

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Fair value portion of other assets.

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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.

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