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Fair Value Measurements (Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments, Held or Issued for Purposes Other Than Trading) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Financial assets: |  |  |
Cash and cash equivalents | $ 83,819 | $ 59,658 | $ 28,613
Debt securities available-for-sale | 32,215 | 41,790 |
Federal Home Loan Bank of Boston stock | 895 | 1,416 |
Loans, net | 1,314,810 | 959,286 |
Accrued interest receivable | 6,371 | 2,854 |
Financial liabilities: |  |  |
Deposits | 1,237,428 | 849,905 |
Borrowings | 13,500 | 24,998 |
Carrying Amount [Member] |  |  |
Financial assets: |  |  |
Cash and cash equivalents | 83,819 | 59,658 |
Debt securities available-for-sale | 32,215 | 41,790 |
Federal Home Loan Bank of Boston stock | 895 | 1,416 |
Loans, net | 1,314,810 | 959,286 |
Accrued interest receivable | 6,371 | 2,854 |
Financial liabilities: |  |  |
Deposits | 1,237,428 | 849,905 |
Borrowings | 13,500 | 24,998 |
Fair Value [Member] |  |  |
Financial assets: |  |  |
Cash and cash equivalents | 83,819 | 59,658 |
Debt securities available-for-sale | 32,215 | 41,790 |
Loans, net | 1,321,143 | 958,270 |
Accrued interest receivable | 6,371 | 2,854 |
Financial liabilities: |  |  |
Deposits | 1,237,867 | 850,774 |
Borrowings | 14,016 | 25,351 |
Quoted Prices In Active Markets Identical Assets Level 1 [Member] | Fair Value [Member] |  |  |
Financial assets: |  |  |
Cash and cash equivalents | 83,819 | 59,658 |
Significant Other Observable Inputs Level 2 [Member] | Fair Value [Member] |  |  |
Financial assets: |  |  |
Debt securities available-for-sale | 32,215 | 41,790 |
Accrued interest receivable | 6,371 | 2,854 |
Financial liabilities: |  |  |
Deposits | 1,237,867 | 850,774 |
Borrowings | 14,016 | 25,351 |
Significant Unobservable Inputs Level 3 [Member] | Fair Value [Member] |  |  |
Financial assets: |  |  |
Loans, net | $ 1,321,143 | $ 958,270 |

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