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Long-Term Obligations (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 09, 2018 | Feb. 07, 2018 | Jan. 17, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |
2018 |  |  |  | $ 1,298 |  |
2019 |  |  |  | 1,340 |  |
2020 |  |  |  | 1,384 |  |
2021 |  |  |  | 71,431 |  |
2022 |  |  |  | 76,241 |  |
Thereafter |  |  |  | 718,546 |  |
Total long-term obligations |  |  |  | 870,240 | $ 832,942 |
Trust Preferred Securities |  |  |  | 116,500 |  |
Gain (Loss) on Extinguishment of Debt |  |  |  | 919 | 1,717 | $ 0
Junior Subordinated Debt [Member] |  |  |  |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |
Total long-term obligations |  |  |  | 120,105 |  |
Junior Subordinated Debt [Member] | Junior Subordinanted Debenture at 3 Month Libor Plus 1.75% Maturing June 30, 2036 [Member] |  |  |  |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |
Total long-term obligations |  |  |  | 90,207 | 90,207 |
Junior Subordinated Debt [Member] | Junior Subordinated Debenture At 3 Month Libor Plus 2 Point 25 Percent Maturing June 15 2034 [Member] [Member] |  |  |  |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |
Total long-term obligations |  |  |  | 19,588 | 24,742 |
Junior Subordinated Debt [Member] | Junior Subordinated Debenture At 3 Month Libor Plus 2 Point 85 Percent Maturing April 7 2034 [Member] [Member] |  |  |  |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |
Total long-term obligations |  |  |  | $ 10,310 | 10,310 |
Subordinated Debt [Member] | Subordinated Notes Payable at 8.00% Maturing June 1, 2018 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate |  |  |  | 8.00% |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |
Total long-term obligations |  |  |  | $ 0 | 15,000 |
Capital Lease Obligations [Member] |  |  |  |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |
Total long-term obligations |  |  |  | 7,795 | 5,701 |
Federal Home Loan Bank Advances [Member] | Rates Ranging from 2.00% to 3.06% and Maturing Through February 2026 [Member] |  |  |  |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |
Total long-term obligations |  |  |  | $ 745,221 | 660,237 |
Federal Home Loan Bank Advances [Member] | Rates Ranging from 2.00% to 3.06% and Maturing Through February 2026 [Member] | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate |  |  |  | 2.00% |  |
Federal Home Loan Bank Advances [Member] | Rates Ranging from 2.00% to 3.06% and Maturing Through February 2026 [Member] | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt interest rate |  |  |  | 3.06% |  |
Unamortized Purchase Accounting Adjustments [Member] |  |  |  |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |
Total long-term obligations |  |  |  | $ (2,964) | (3,350) |
Other Long Term Debt [Member] |  |  |  |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |
Total long-term obligations |  |  |  | $ 83 | $ 30,095 |
Libor 3 Month Rate [Member] | Junior Subordinated Debt [Member] | Junior Subordinanted Debenture at 3 Month Libor Plus 1.75% Maturing June 30, 2036 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Description of variable rate basis |  |  |  | 3-month LIBOR |  |
Basis spread on variable rate |  |  |  | 1.75% |  |
Libor 3 Month Rate [Member] | Junior Subordinated Debt [Member] | Junior Subordinated Debenture At 3 Month Libor Plus 2 Point 25 Percent Maturing June 15 2034 [Member] [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Description of variable rate basis |  |  |  | 3-month LIBOR |  |
Basis spread on variable rate |  |  |  | 2.25% |  |
Libor 3 Month Rate [Member] | Junior Subordinated Debt [Member] | Junior Subordinated Debenture At 3 Month Libor Plus 2 Point 85 Percent Maturing April 7 2034 [Member] [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Description of variable rate basis |  |  |  | 3-month LIBOR |  |
Basis spread on variable rate |  |  |  | 2.85% |  |
Subsequent Event |  |  |  |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |
Trust Preferred Securities Purchased |  | $ 2,000 |  |  |  |
Payments to Acquire Trust Preferred Investments |  | $ 1,800 |  |  |  |
Subsequent Event | Federal Home Loan Bank Advances [Member] |  |  |  |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |
Extinguishment of Debt, Amount | $ 350,000 |  | $ 325,000 |  |  |
Gain (Loss) on Extinguishment of Debt | $ 12,100 |  | $ 13,600 |  |  |

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