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Significant Accounting Policies Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accrued interest receivable and other assets | $ 308,347 | $ 340,018
Junior subordinated deferrable interest debentures, net of unamortized issuance costs | 136,083 | 136,069
Other long-term borrowings, net of unamortized issuance costs | $ 99,900 | 99,870
Adjustments for New Accounting Pronouncement [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accrued interest receivable and other assets |  | (1,176)
Junior subordinated deferrable interest debentures, net of unamortized issuance costs |  | (1,046)
Other long-term borrowings, net of unamortized issuance costs |  | $ (130)

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