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Significant Accounting Policies Significant Accounting Policies - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Accrued interest receivable and other assets | $ 319,968 |  | $ 319,968 |  | $ 340,018
Junior subordinated deferrable interest debentures, net of unamortized issuance costs | 136,112 |  | 136,112 |  | 136,069
Other long-term borrowings, net of unamortized issuance costs | 99,960 |  | 99,960 |  | 99,870
Income Tax Expense (Benefit) | $ 10,852 | $ 12,130 | $ 28,622 | $ 36,814 |
Earnings Per Share, Diluted | $ 1.24 | $ 1.17 | $ 3.42 | $ 3.39 |
Excess Tax Benefit from Share-based Compensation, Operating Activities |  |  | $ 1,610 | $ 880 |
Adjustments for New Accounting Pronouncement [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Accrued interest receivable and other assets |  |  |  |  | (1,200)
Junior subordinated deferrable interest debentures, net of unamortized issuance costs |  |  |  |  | 1,000
Other long-term borrowings, net of unamortized issuance costs |  |  |  |  | $ 130
Income Tax Expense (Benefit) | $ (1,500) |  | $ (1,600) |  |
Earnings Per Share, Diluted | $ 0.02 |  | $ 0.03 |  |
Excess Tax Benefit from Share-based Compensation, Operating Activities |  |  |  | 880 |
Excess Tax Benefit from Share-based Compensation, Financing Activities |  |  |  | $ (880) |

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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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