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Borrowings, Long-term Debt (Details) - USD ($) $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 29, 2018 | Apr. 02, 2007 | Mar. 30, 2007 | May 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Long-term debt [Abstract] |  |  |  |  |  |  |
Debt instrument, purchase price |  |  |  |  | $ 0 | $ 1,440 | $ 0
Gain on repurchase of debt instrument |  |  |  |  | 0 | 560 | $ 0
Junior Subordinated Debentures [Member] |  |  |  |  |  |  |
Long-term debt [Abstract] |  |  |  |  |  |  |
Issuance of debt |  |  | $ 61,341 |  |  |  |
Long-term debt |  |  |  |  | $ 59,341 | $ 59,341 |
Interest rate on junior subordinated debentures | 4.33% |  | 6.52% |  |  |  |
Maturity date of junior subordinated debentures |  |  |  |  | Jun. 01, 2037 |  |
Maturity period of debentures |  |  |  |  | 30 years |  |
Period after which debentures are redeemable |  |  |  |  | 5 years |  |
Repayment of debt |  | $ 61,341 |  |  |  |  |
Debt instrument, repurchased face amount |  |  |  | $ 2,000 |  |  |
Debt instrument, purchase price |  |  |  | 1,440 |  |  |
Gain on repurchase of debt instrument |  |  |  | $ 560 |  |  |
Junior Subordinated Debentures [Member] | LIBOR Rate [Member] |  |  |  |  |  |  |
Long-term debt [Abstract] |  |  |  |  |  |  |
Term of variable rate |  |  |  |  | 3 months |  |
Basis spread on variable rate | 1.59% |  | 1.59% |  |  |  |
Reference rate | 2.74% |  |  |  |  |  |
Junior Subordinated Debentures [Member] | Subordinated Debentures 9.0% [Member] |  |  |  |  |  |  |
Long-term debt [Abstract] |  |  |  |  |  |  |
Interest rate on junior subordinated debentures |  | 9.00% |  |  |  |  |
Junior Subordinated Debentures [Member] | Subordinated Debentures 8.25% [Member] |  |  |  |  |  |  |
Long-term debt [Abstract] |  |  |  |  |  |  |
Interest rate on junior subordinated debentures |  | 8.25% |  |  |  |  |
Unconsolidated Delaware Statutory Trust Subsidiary [Member] |  |  |  |  |  |  |
Long-term debt [Abstract] |  |  |  |  |  |  |
Issuance of capital securities in a private placement |  |  | $ 59,500 |  |  |  |

X
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- Definition This line item represents the period after which the debentures are redeemable at the option of the entity, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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