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Debt - Narrative (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 23, 2015 | Dec. 31, 2017 | Dec. 31, 2020 | Dec. 31, 2019 | May 31, 2020 | Jun. 21, 2019 | Jun. 20, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |
Purchase of FHLB activity-based common stock as percentage of borrowing, required |  |  | 4.50% |  |  |  |
Purchase of FHLB activity-based common stock as percentage of borrowing, percentage, authorized |  |  |  | 15.00% |  |  |
Principal borrowings on Bank Credit Facility |  | $ 50,000,000.0 |  |  |  |  |
FHLB advances interest rate |  |  | 0.44% |  |  |  |
Proceeds from COVID relief advance |  |  |  |  | $ 4,000,000.0 |  |
Minimum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Purchase of FHLB activity-based common stock as percentage of borrowing, required |  |  | 2.00% |  |  |  |
Long-term debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
FHLB advances |  |  | $ 54,000,000.0 |  |  |  |
October 5, 2022 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
FHLB advances |  | 25,000,000.0 |  |  |  |  |
December 2, 2022 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
FHLB advances |  | $ 25,000,000.0 |  |  |  |  |
4.50% Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal amount | $ 250,000,000.0 |  | $ 250,000,000 | $ 250,000,000 |  |  |
Stated rate | 4.50% |  | 4.50% | 4.50% |  |  |
Discount percent on issuance | 0.265% |  |  |  |  |  |
Effective interest percentage | 4.53% |  |  |  |  |  |
Debt redemption price, percentage | 100.00% |  |  |  |  |  |
Debt redemption price, interest discounted at treasury yield margin | 0.35% |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt term |  |  | 5 years |  |  |  |
Borrowing capacity |  |  |  |  |  | $ 150,000,000.0 | $ 225,000,000.0
Senior revolving credit facility |  |  | $ 135,000,000.0 |  |  |  |
Commitment fee percent |  |  | 0.15% |  |  |  |
London Interbank Offered Rate (LIBOR) | Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.15% |  |  |  |

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- Definition Federal Home Loan Bank, Purchase Of FHLB Activity Based Common Stock As Percentage Of Borrowing, Required + References No definition available. + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 3: 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 and noncurrent portions 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: 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(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=120400017&loc=d3e572229-122910 + Details
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