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v3.20.2

Investment Securities - Additional Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) state loan security | Jun. 30, 2020 USD ($) state security | Jun. 30, 2019 USD ($) security | Dec. 31, 2019 USD ($) security | Dec. 31, 2014 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Number of securities temporarily impaired (security) | security | 52 | 52 | 133 | 86 |
Number of securities temporarily impaired for twelve months or more (security) | security | 11 | 11 | 127 | 28 |
Length of time securities temporarily impaired |  | 12 months | 12 months | 12 months |
Amortized cost of transferred securities from available-for-sale to held-to-maturity |  |  |  |  | $ 89,780
Fair value of transferred securities from available-for-sale to held-to-maturity |  |  |  |  | 89,757
Net unrealized loss, net of taxes on transferred securities |  |  |  |  | $ 15
Unamortized balance of net unrealized losses | $ 146 | $ 146 | $ 190 | $ 182 |
Number of states in New England where FHLB serve (state) | state | 6 | 6 |  |  |
FHLB stock investment | $ 9,508 | $ 9,508 | $ 7,945 | 7,945 |
State and political subdivisions |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Number of municipal securities sold | loan | 28 |  |  |  |
Proceeds from sales of municipal securities | $ 8,600 |  |  |  |
Cumulative book value | 8,313 |  |  |  |
Net realized gain from sale of municipal securities | 268 |  |  |  |
Percentage of overall security holdings downgraded |  |  | 0.06% |  |
Other equity securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Fair value of securities pledged as collateral | $ 245,917 | $ 245,917 | $ 190,725 | $ 214,173 |

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