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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.