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Subsequent Event - subordinated debt issuance (Details) - Subsequent Event [Member] - Subordinated Notes Due 2031 [Member] - Private Placement [Member] $ in Millions | Apr. 16, 2021 USD ($)
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Subordinated debt issuance [Abstract] |
Aggregate principal amount | $ 10
Percentage of offering of fixed-to-floating rate | 4.00%
Notes maturity date | Apr. 16, 2031
Basis points, payable quarterly | 3.23%
Term of variable rate | 90 days

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