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Investment Securities - Textual (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) security | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Schedule of Available-for-sale Securities |  |  |
Unrealized gain (loss) on available for sale portfolio | $ (6,257,000) | $ 4,089,000 |
Tax liabilities (benefits) associated with available-for-sale portfolio | (1,850,000) | 1,186,000 |
Gross realized gains from sales or calls | 0 | 0 | $ 696,000
Remaining unaccreted balance of HTM securities |  | 0 |
Income tax impact from the reclassification of unrealized net gains on available-for-sale securities to | 388,000 | $ 1,178,000 | 515,000
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 | 470,162,000 | 531,192,000 |
Available-for-sale investment securities, Amortized cost | 470,162,000 | 531,192,000 |
Securities pledged as collateral | 79,662,000 | 90,541,000 |
Securities Pledged as Collateral |  |  |
Schedule of Available-for-sale Securities |  |  |
Available-for-sale investment securities, Amortized cost | $ 80,001,000 | 88,930,000 |
U.S. Government agencies |  |  |
Schedule of Available-for-sale Securities |  |  |
Available-for-sale Securities, Number of Positions | security | 6 |  |
Debt securities, amortized cost | $ 21,723,000 | 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 | 4 |  |
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 |  |
Obligations of states and political subdivisions |  |  |
Schedule of Available-for-sale Securities |  |  |
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale, Portion in Other Comprehensive Loss, before Tax, Including Portion Attributable to Noncontrolling Interest | $ 136,000 |  |
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Number of Impaired Securities | security | 1 |  |
Available-for-sale Securities, Other than Temporary Impaired Security | $ 2,995,000 |  |
Available-for-sale Debt Securities, Other than Temporary Impairment Security, Amortized Cost Basis | $ 3,131,000 |  |
Available-for-sale Securities, Number of Positions | security | 52 |  |
Debt securities, amortized cost | $ 79,886,000 | 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 | 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 | 8 |  |
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 | 137 |  |
Debt securities, amortized cost | $ 239,388,000 | 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 | 23 |  |
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 | 60 |  |
Private label residential mortgage and asset backed securities |  |  |
Schedule of Available-for-sale Securities |  |  |
Unrealized gain (loss) on available for sale portfolio | $ (3,016,000) |  |
Available-for-sale Securities, Number of Positions | security | 36 |  |
Debt securities, amortized cost | $ 129,165,000 | $ 91,033,000 |
Private label residential mortgage and asset backed securities | External Credit Rating, Non Investment Grade [Member] |  |  |
Schedule of Available-for-sale Securities |  |  |
Available-for-sale Securities, Number of Positions | security | 8 |  |
Debt securities, amortized cost | $ 1,137,000 |  |
Private label residential 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 | 7 |  |

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