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Investments - Textual (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) security | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) security | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale Securities pledged as collateral | $ 81,989,000 |  | $ 81,989,000 |  |
Equity securities | 7,184,000 |  | 7,184,000 |  | $ 7,423,000
Unrealized gain (loss) of available-for sale securities | (10,401,000) |  | (10,401,000) |  | 4,089,000
AOCI available-for-sale securities adjustment tax | (3,075,000) |  | (3,075,000) |  | 1,186,000
Income tax impact from the reclassification of unrealized net gains on available-for-sale securities to realized net gains on available-for-sale securities | 112,000 | $ 71,000 | $ 377,000 | $ 1,181,000 |
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 |  |  | $ 10,000 |  |
Other than temporary impairment losses on investment securities |  |  | 0 | $ 0 |
Debt securities, amortized cost | $ 445,098,000 |  | $ 445,098,000 |  |
U.S. Government agencies |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale securities, number of positions | security | 6 |  | 6 |  |
Debt securities, amortized cost | $ 22,728,000 |  | $ 22,728,000 |  | 65,994,000
U.S. Government agencies | Less than 12 months |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale securities in unrealized loss positions, number of positions | security | 5 |  | 5 |  |
U.S. Government agencies | Greater than 12 months |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale securities in unrealized loss positions, number of positions | security | 1 |  | 1 |  |
Obligations of states and political subdivisions |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale securities, number of positions | security | 41 |  | 41 |  |
Debt securities, amortized cost | $ 65,839,000 |  | $ 65,839,000 |  | 136,955,000
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 | 12 |  | 12 |  |
Obligations of states and political subdivisions | Greater than 12 months |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale securities in unrealized loss positions, number of positions | security | 1 |  | 1 |  |
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 | 142 |  | 142 |  |
Debt securities, amortized cost | $ 250,331,000 |  | $ 250,331,000 |  | 237,210,000
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 | 43 |  | 43 |  |
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 | 34 |  | 34 |  |
Private label mortgage and asset backed securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Unrealized gain (loss) of available-for sale securities | $ (3,808,000) |  | $ (3,808,000) |  |
Available-for-sale securities, number of positions | security | 31 |  | 31 |  |
Debt securities, amortized cost | $ 106,200,000 |  | $ 106,200,000 |  | 91,033,000
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 | 10 |  | 10 |  |
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 | 11 |  | 11 |  |
Other equity securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Equity securities |  |  |  |  | 7,500,000
Fair Value |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Equity securities | $ 7,184,000 |  | $ 7,184,000 |  | 7,423,000
Recurring | Fair Value | Other equity securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Equity securities | $ 7,184,000 |  | $ 7,184,000 |  | $ 7,423,000

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