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Notes Payable and Subordinated Borrowings - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 30, 2016 | Apr. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015
Notes Payable [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 |  |  | $ 16,550,000 | $ 22,550,000
Senior Notes [Member] |  |  |  |
Notes Payable [Line Items] |  |  |  |
Long-term Debt, Gross | $ 170,000,000 |  |  |
Series A Senior Notes [Member] |  |  |  |
Notes Payable [Line Items] |  |  |  |
Long-term Debt, Gross | $ 38,000,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage (as a percent) | 4.88% |  |  |
Series B Senior Notes [Member] |  |  |  |
Notes Payable [Line Items] |  |  |  |
Long-term Debt, Gross | $ 67,000,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage (as a percent) | 5.23% |  |  |
Series C Senior Notes [Member] |  |  |  |
Notes Payable [Line Items] |  |  |  |
Long-term Debt, Gross | $ 48,000,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage (as a percent) | 5.48% |  |  |
Series D Senior Notes [Member] |  |  |  |
Notes Payable [Line Items] |  |  |  |
Long-term Debt, Gross | $ 17,000,000 |  |  |
Debt Instrument, Interest Rate, Stated Percentage (as a percent) | 5.58% |  |  |
Senior Notes [Member] |  |  |  |
Notes Payable [Line Items] |  |  |  |
Extinguishment of Debt, Amount | $ 120,000,000 |  |  |
Subordinated Debt [Member] |  |  |  |
Notes Payable [Line Items] |  |  |  |
Extinguishment of Debt, Amount |  | $ 6,000,000 |  |

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. + References Reference 1: 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 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 19, 20, 22 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 10 -Section F + Details
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