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Notes Payable and Subordinated Borrowings - Additional Information (Details) - USD ($) |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 30, 2016 | May 31, 2018 | Mar. 31, 2018 | Apr. 30, 2017 | Feb. 28, 2017 | Sep. 30, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |
Minimum Repayment of Aggregate Principal Amount of Senior Notes (as a percent) |  |  |  |  |  | 5.00% |
Outstanding Principal Amount of Senior Notes (as a percent) |  |  |  |  |  | 100.00% |
Subordinated Borrowing, Interest Rate (as a percent) |  |  |  |  |  | 5.50% |
Subordinated Borrowings |  |  |  |  |  | $ 0 | $ 6,799,000
Subordinated Debt [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Extinguishment of Debt, Amount |  | $ 99,000 | $ 6,700,000 | $ 3,751,000 | $ 6,000,000 |  |
Parent Company [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Extinguishment of Debt, Amount | $ 120,000,000 |  |  |  |  |  |
Parent Company [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross | 170,000,000 |  |  |  |  |  |
Parent Company [Member] | Series A Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross | $ 38,000,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.88% |  |  |  |  |  |
Parent Company [Member] | Series B Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross | $ 67,000,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.23% |  |  |  |  |  |
Parent Company [Member] | Series C Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross | $ 48,000,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.48% |  |  |  |  |  |
Parent Company [Member] | Series D Senior Notes [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term Debt, Gross | $ 17,000,000 |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.58% |  |  |  |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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