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Investments - Textual (Details) | 6 Months Ended |
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Jun. 30, 2021 USD ($) security Loans | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Schedule of Available-for-sale Securities |  |  |
Available-for-sale Securities pledged as collateral | $ 191,882,000 |  |
Unrealized gain (loss) of available-for sale securities | 18,278,000 |  | $ 21,091,000
AOCI available-for-sale securities adjustment tax | $ 5,404,000,000 |  | 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 |  | $ 1,224,000 |
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 | $ 934,138,000 |  |
Available-for-sale Securities, Number of Securities, Loss Position | Loans | 5 |  |
U.S. Government agencies |  |  |
Schedule of Available-for-sale Securities |  |  |
Available-for-sale securities, number of positions | security | 1 |  |
Debt securities, amortized cost | $ 637,000 |  | 651,000
Obligations of states and political subdivisions |  |  |
Schedule of Available-for-sale Securities |  |  |
Available-for-sale securities, number of positions | security | 122 |  |
Debt securities, amortized cost | $ 458,250,000 |  | 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 | 16 |  |
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 | 115 |  |
Debt securities, amortized cost | $ 224,920,000 |  | 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 | 8 |  |
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 | 11 |  |
Private label mortgage and asset backed securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Available-for-sale securities, number of positions | security | 49 |  |
Debt securities, amortized cost | $ 180,844,000 |  | 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 | 18 |  |
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 | 2 |  |
Corporate debt securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Available-for-sale securities, number of positions | security | 14 |  |
Debt securities, amortized cost | $ 49,500,000 |  | $ 30,000,000
U.S. Treasury securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Available-for-sale securities, number of positions | security | 2 |  |
Available-for-sale securities in unrealized loss positions, number of positions | security | 1 |  |
Debt securities, amortized cost | $ 19,987,000 |  |

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