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Investments - Textual (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2016 USD ($) security | Sep. 30, 2017 USD ($) security investment | Sep. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) security | Sep. 30, 2017 USD ($) security investment | Sep. 30, 2016 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2016 USD ($)
Schedule of Available-for-sale Securities |  |  |  |  |  |  |  |
Available-for-sale Securities pledged as collateral |  | $ 96,042,000 |  |  | $ 96,042,000 |  |  |
Unrealized gain (loss) of available-for sale securities |  | 7,600,000 |  |  | 7,600,000 |  |  | $ (891,000)
AOCI available-for-sale securities adjustment tax |  | 3,195,000 |  |  | 3,195,000 |  |  | (375,000)
Transfer of securities from available-for-sale to held-to-maturity |  |  |  | $ 8,500,000 |  |  | $ 31,000,000 |
Fair value of held-to-maturity investment securities transferred | $ 23,100,000 |  |  | $ 23,100,000 |  |  | 32,000,000 |
Unrealized gain on transfer of securities from available-for-sale to held-to-maturity |  |  |  |  |  |  | $ 163,000 |
Held-to-maturity securities, number of securities sold | security |  |  |  | 5 |  |  |  |
Investments, number of securities sold | security |  |  |  | 13 |  |  |  |
Gross realized gains from sales or calls |  | 0 | $ 0 | $ 696,000 | 0 | $ 696,000 |  |
Income tax impact from the reclassification of unrealized net gains on available-for-sale securities to realized net gains on available-for-sale securities |  | 71,000 | 120,000 |  | $ 1,181,000 | 479,000 |  |
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 | $ 136,000 |  |
Debt securities, amortized cost |  | $ 507,477,000 |  |  | $ 507,477,000 |  |  |
Obligations of states and political subdivisions |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |  |  |  |
Other than temporary impairment losses, investments, portion in other comprehensive loss, before tax, including portion attributable to noncontrolling interest, available-for-sale securities | $ 136,000 |  |  |  |  |  |  |
Other than temporary impairment losses, investments, available-for-sale securities, number of impaired securities | security | 1 |  |  | 1 |  |  |  |
Available-for-sale securities, other than temporary impaired security | $ 2,995,000 |  |  | $ 2,995,000 |  |  |  |
Available-for-sale debt securities, other than temporary impairment security, amortized cost basis | $ 3,131,000 |  |  | $ 3,131,000 |  |  |  |
Available-for-sale securities, number of positions | security |  | 122 |  |  | 122 |  |  |
Debt securities, amortized cost |  | $ 204,841,000 |  |  | $ 204,841,000 |  |  | 288,543,000
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 |  | 2 |  |  | 2 |  |  |
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 |  | 6 |  |  | 6 |  |  |
U.S. Government agencies |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |  |  |  |
Available-for-sale securities, number of positions | security |  | 21 |  |  | 21 |  |  |
Debt securities, amortized cost |  | $ 61,253,000 |  |  | $ 61,253,000 |  |  | 69,005,000
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 |  | 0 |  |  | 0 |  |  |
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 |  | 2 |  |  | 2 |  |  |
U.S. Government 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 |  | $ 190,028,000 |  |  | $ 190,028,000 |  |  | 181,785,000
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 |  | 23 |  |  | 23 |  |  |
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 |  | 26 |  |  | 26 |  |  |
Private label mortgage backed securities |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |  |  |  |
Unrealized gain (loss) of available-for sale securities |  | $ 599,000 |  |  | $ 599,000 |  |  |
Available-for-sale securities, number of positions | security |  | 22 |  |  | 22 |  |  |
Available-for-sale securities in unrealized loss positions, number of positions | security |  | 8 |  |  | 8 |  |  |
Debt securities, amortized cost |  | $ 43,855,000 |  |  | $ 43,855,000 |  |  | $ 1,807,000
Private label mortgage backed securities | Below investment grade |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |  |  |  |
Available-for-sale securities, number of positions | security |  | 10 |  |  | 10 |  |  |
Debt securities, amortized cost |  | $ 1,431,000 |  |  | $ 1,431,000 |  |  |
Other equity securities |  |  |  |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |  |  |  |
Unrealized gain (loss) of available-for sale securities |  | $ (14,000) |  |  | $ (14,000) |  |  |
Available for sale securities, number of securities | investment |  | 1 |  |  | 1 |  |  |

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