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Investments - Textual (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) security | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) security | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale Securities pledged as collateral | $ 77,909,000 |  | $ 77,909,000 |  |
Equity securities | 7,254,000 |  | 7,254,000 |  | $ 7,423,000
Unrealized gain (loss) of available-for sale securities | (6,512,000) |  | (6,512,000) |  | 4,089,000
AOCI available-for-sale securities adjustment tax | (1,925,000) |  | (1,925,000) |  | 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 | 24,000 | $ 907,000 | $ 265,000 | $ 1,110,000 |
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 | $ 490,513,000 |  | $ 490,513,000 |  |
U.S. Treasury securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale securities, number of positions | security | 1 |  | 1 |  |
Debt securities, amortized cost | $ 32,741,000 |  | $ 32,741,000 |  |
U.S. Government agencies |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale securities, number of positions | security | 2 |  | 2 |  |
Debt securities, amortized cost | $ 7,228,000 |  | $ 7,228,000 |  | 65,994,000
Obligations of states and political subdivisions |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale securities, number of positions | security | 67 |  | 67 |  |
Debt securities, amortized cost | $ 130,743,000 |  | $ 130,743,000 |  | 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 | 14 |  | 14 |  |
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 agencies collateralized by residential mortgage obligations |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale securities, number of positions | security | 141 |  | 141 |  |
Debt securities, amortized cost | $ 227,027,000 |  | $ 227,027,000 |  | 237,210,000
U.S. Government 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 | 51 |  | 51 |  |
U.S. Government 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 | 27 |  | 27 |  |
Private label mortgage and asset backed securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Unrealized gain (loss) of available-for sale securities | $ (3,169,000) |  | $ (3,169,000) |  |
Available-for-sale securities, number of positions | security | 29 |  | 29 |  |
Debt securities, amortized cost | $ 92,774,000 |  | $ 92,774,000 |  | 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 | 12 |  | 12 |  |
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 | 7 |  | 7 |  |
Other equity securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Equity securities |  |  |  |  | 7,500,000
Fair Value |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Equity securities | $ 7,254,000 |  | $ 7,254,000 |  | 7,423,000
Recurring | Fair Value | Other equity securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Equity securities | $ 7,254,000 |  | $ 7,254,000 |  | $ 7,423,000

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