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Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Jul. 11, 2016 | Jun. 05, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition Equity Interests Issued Or Issuable [Line Items] |  |  |  |
Number of shares authorized to be repurchased |  |  | 7,400,000 |
Purchase of treasury stock |  |  | $ 113,462 | $ 117,752
Treasury Stock, Shares, Acquired |  |  | 3,400,000 | 2,700,000
Treasury Stock Acquired, Average Cost Per Share |  |  | $ 33.22 | $ 43.91
Issuance of preferred stock |  |  | $ 145,051 |
Preferred stock, par value |  |  | $ 1 | $ 1
Non-Cumulative Perpetual Preferred Stock, Series A [Member] |  |  |  |
Business Acquisition Equity Interests Issued Or Issuable [Line Items] |  |  |  |
Issuance of preferred stock | $ 150,000 |  |  |
Preferred stock, dividend rate percentage | 6.25% |  |  |
Preferred stock, par value | $ 1.00 |  |  |
Preferred stock liquidation preference per depositary share | 25 |  |  |
Preferred stock, liquidation preference per share | $ 25,000 |  |  |
Eaton Partners and ISM [Member] |  |  |  |
Business Acquisition Equity Interests Issued Or Issuable [Line Items] |  |  |  |
Stock Issued During Period Shares Acquisitions |  |  | 300,000 |
Sterne Agee Group, Inc. [Member] |  |  |  |
Business Acquisition Equity Interests Issued Or Issuable [Line Items] |  |  |  |
Stock Issued During Period Shares Acquisitions |  | 1,400,000 |  |

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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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