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Debt - Summary of Debt (Details) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020 | Nov. 23, 2015
--- | --- | --- | ---
Long-term debt |  |  |
Long-term debt | $ 253,600,000 | $ 302,300,000 |
Total | $ 502,600,000 | 437,300,000 |
FHLB advances interest rate | 0.00% |  |
Bank Credit Facility |  |  |
Short-term debt |  |  |
Bank Credit Facility | $ 249,000,000 | 135,000,000.0 |
4.50% Senior Notes |  |  |
Long-term debt |  |  |
Long-term debt | $ 248,600,000 | 248,300,000 |
Interest Rates | 4.50% |  | 4.50%
Principal amount | $ 250,000,000.0 |  | $ 250,000,000
Unamortized discount | 300,000 | 400,000 |
Unamortized debt issuance costs | 1,100,000 | 1,300,000 |
Federal Home Loan Bank borrowing |  |  |
Long-term debt |  |  |
Long-term debt | $ 5,000,000.0 | $ 54,000,000.0 |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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