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Long-Term Debt - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2014 | Dec. 31, 2012 | Nov. 30, 2012
Debt Instrument [Line Items] |  |  |  |  |  |
Prepayment penalty on long-term debt | $ 0 | $ 0 | $ 5,554 |  |  |
Gains (Losses) on Restructuring of Debt |  |  | 5,600 | $ 3,200 |  |
Amortization of prepayment penalty on long-term debt | 0 | $ 5,719 | 6,176 |  |  |
Prepayment Penalty, Future Amortization Expense [Abstract] |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal after Year Five | $ 0 |  |  |  |  |
FHLB Debt Prepaid |  |  | $ 50,000 |  |  |
FHLB Debt Prepaid Weighted Avg Rate |  |  | 3150.00% |  |  |
FHLB Debt Amount Restructured |  |  |  | $ 50,000 |  |
Broker Repurchase Agreements |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt repurchased during period |  |  |  |  |  | $ 300,000
Debt repurchased during period, rate |  |  |  |  |  | 1.75%
Prepayment penalty on long-term debt |  |  |  |  | $ 25,000 |
Effective interest rate percentage | 3.55% |  |  |  |  |
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt repurchased during period, rate |  |  |  | 1.25% |  |
Effective interest rate percentage | 3.52% |  |  |  |  |

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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