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Long-Term Debt - Schedule of long-Term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Long-term Debt, Fiscal Year Maturity [Abstract] |  |
2017 | $ 350,000 |
2018 | 150,000 | $ 350,000
2019 | 75,000 | 150,000
2020 | 25,000 | 75,000
2021 | 0 | 25,000
2021 |  | 0
Thereafter | 100,000 | 150,000
Total long-term debt, excluding prepayment penalty | 700,000 | 750,000
Prepayment penalty | (5,719) | (11,895)
Total long-term debt | $ 694,281 | $ 738,105
Long-term Debt, Fiscal Year Maturity, Average Rate [Abstract] [Abstract] |  |
2017 | 1.68% |
2018 | 2.04% | 1.68%
2019 | 1.96% | 2.04%
2020 | 2.14% | 1.96%
2021 | 0.00% | 2.14%
2021 |  | 0.00%
Long-term Debt, Maturities, Repayments of Principal after Year Five | $ 100,000 |
Thereafter |  | 3.32%
Average rate, total, excluding prepayment penalty | 2.05% | 2.12%
Average rate, total | 2.07% | 2.16%
Long Term Debt Maturities Average Rate In After Year Five | 3.40% |
FHLB Advances |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
2017 | $ 50,000 |
2018 | 150,000 | $ 50,000
2019 | 75,000 | 150,000
2020 | 25,000 | 75,000
2021 | 0 | 25,000
2021 |  | 0
Thereafter |  | 150,000
Total long-term debt, excluding prepayment penalty | $ 400,000 | $ 450,000
Long-term Debt, Fiscal Year Maturity, Average Rate [Abstract] [Abstract] |  |
2017 | 1.25% |
2018 | 2.04% | 1.25%
2019 | 1.96% | 2.04%
2020 | 2.14% | 1.96%
2021 | 0.00% | 2.14%
2021 |  | 0.00%
Long-term Debt, Maturities, Repayments of Principal after Year Five | $ 100,000 |
Thereafter |  | 3.32%
Average rate, total, excluding prepayment penalty | 2.27% | 2.37%
Long Term Debt Maturities Average Rate In After Year Five | 3.40% |
Broker Repurchase Agreements |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |
2019 | $ 300,000 |
2020 |  | $ 300,000
Total long-term debt, excluding prepayment penalty | $ 300,000 | $ 300,000
Long-term Debt, Fiscal Year Maturity, Average Rate [Abstract] [Abstract] |  |
2019 | 1.75% |
2020 |  | 1.75%
Average rate, total, excluding prepayment penalty | 1.75% | 1.75%

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