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Borrowed Funds - Summary of Fixed-To-Floating Rate Subordinated Notes Outstanding (Details) - Subordinated Debt - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Debt Outstanding [Line Items] |  |  |
Stated Maturity | Nov. 06, 2028 | Nov. 06, 2028 |
Interest rate of subordinated note | 5.90% | 5.90% | [1]
Principal amount of Subordinated Notes | $ 300,000 | $ 300,000 |
[1] | From and including the date of original issuance to, but excluding November 6, 2023, the Notes will bear interest at an initial rate of 5.90% per annum payable semi-annually. Unless redeemed, from and including November 6, 2023 to but excluding the maturity date, the interest rate will reset quarterly to an annual interest rate equal to the then-current three-month LIBOR rate plus 278 basis point payable quarterly.

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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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