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Off-Balance Sheet Financial Instruments and Guarantees (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Loss Contingencies [Line Items] |  |
Financial instrument commitments | $ 221,911 | $ 104,754
Commitments to grant loans [Member] |  |
Loss Contingencies [Line Items] |  |
Financial instrument commitments | 78,310 | 44,246
Unfunded commitments under lines of credit [Member] |  |
Loss Contingencies [Line Items] |  |
Financial instrument commitments | 137,965 | 56,840
Standby letters of credit [Member] |  |
Loss Contingencies [Line Items] |  |
Financial instrument commitments | $ 5,636 | $ 3,668

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