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Investments - Textual (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) security Loans | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) security Loans | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale Securities pledged as collateral | $ 262,024,000 |  | $ 262,024,000 |  |
Unrealized gain (loss) of available-for sale securities | 14,609,000 |  | 14,609,000 |  | $ 21,091,000
AOCI available-for-sale securities adjustment tax | 4,319,000,000 |  | 4,319,000,000 |  | 6,235,000
Income tax impact from the reclassification of unrealized net gains on available-for-sale securities to realized net gains on available-for-sale securities | 35,000 | $ 17,000 | $ 11,000 | $ 1,241,000 |
Threshold period of value decline in available-for-sale securities to be considered other than temporary impairment |  |  | 12 months |  |
Threshold percentage of value decline in available-for-sale securities to be considered other than temporary impairment |  |  | 10.00% |  |
Threshold amount of value decline in available-for-sale securities to be considered other than temporary impairment |  |  | $ 75,000 |  |
Other than temporary impairment losses on investment securities |  |  | 0 |  |
Debt securities, amortized cost | $ 1,045,753,000 |  | $ 1,045,753,000 |  |
Available-for-sale Securities, Number of Securities, Loss Position | Loans | 8 |  | 8 |  |
U.S. Government agencies |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale securities, number of positions | security | 1 |  | 1 |  |
Debt securities, amortized cost | $ 489,000 |  | $ 489,000 |  | 651,000
Obligations of states and political subdivisions |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale securities, number of positions | security | 129 |  | 129 |  |
Debt securities, amortized cost | $ 494,425,000 |  | $ 494,425,000 |  | 361,734,000
Obligations of states and political subdivisions | Less than 12 months |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale securities in unrealized loss positions, number of positions | security | 25 |  | 25 |  |
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale securities, number of positions | security | 119 |  | 119 |  |
Debt securities, amortized cost | $ 226,027,000 |  | $ 226,027,000 |  | 214,203,000
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations | Less than 12 months |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale securities in unrealized loss positions, number of positions | security | 14 |  | 14 |  |
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations | Greater than 12 months |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale securities in unrealized loss positions, number of positions | security | 9 |  | 9 |  |
Private label mortgage and asset backed securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale securities, number of positions | security | 63 |  | 63 |  |
Debt securities, amortized cost | $ 255,324,000 |  | $ 255,324,000 |  | 82,413,000
Private label mortgage and asset backed securities | Less than 12 months |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale securities in unrealized loss positions, number of positions | security | 31 |  | 31 |  |
Private label mortgage and asset backed securities | Greater than 12 months |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale securities in unrealized loss positions, number of positions | security | 4 |  | 4 |  |
Corporate debt securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale securities, number of positions | security | 15 |  | 15 |  |
Debt securities, amortized cost | $ 59,500,000 |  | $ 59,500,000 |  | $ 30,000,000
U.S. Treasury securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale securities, number of positions | security | 1 |  | 1 |  |
Debt securities, amortized cost | $ 9,988,000 |  | $ 9,988,000 |  |

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