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Investment Securities - Textual (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) security | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) security
Schedule of Available-for-sale Securities |  |  |  |
Unrealized gain (loss) on available for sale portfolio | $ 4,012,000 | $ (891,000) |  |
Tax liabilities (benefits) associated with available-for-sale portfolio | 1,186,000 | (375,000) |  |
Transfer of securities from available-for-sale to held-to-maturity |  |  |  | $ 31,000,000
HTM transfers to AFS securities, fair value | 0 | 23,100,000 |  |
Transfers to held-to-maturity, fair value |  |  |  | 32,000,000
Unrealized gain (loss) on transfer of securities from available-for-sale to held-to-maturity |  |  |  | $ 163,000
HTM, number of securities sold | security |  |  |  | 5
Number of securities sold | security |  |  |  | 13
Book Value of HTM securities sold |  | 8,500,000 |  |
Gross realized gains from sales or calls | 0 | 696,000 | $ 14,000 |
Remaining unaccreted balance of HTM securities |  | 0 |  |
Income tax impact from the reclassification of unrealized net gains on available-for-sale securities to | 1,178,000 | $ 515,000 | 615,000 |
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 | 136,000 | $ 0 |
Debt securities, amortized cost | 538,692,000 | 548,640,000 |  |
Available-for-sale investment securities, Amortized cost | 538,692,000 | 548,640,000 |  |
Available-for-sale Securities Pledged as Collateral | 90,541,000 | 88,903,000 |  |
Securities Pledged as Collateral |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Available-for-sale investment securities, Amortized cost | $ 88,930,000 | 86,418,000 |  |
U.S. Government agencies |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Available-for-sale Securities, Number of Positions | security | 22 |  |  |
Debt securities, amortized cost | $ 65,994,000 | 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 | 2 |  |  |
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 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 |  |  |
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 | 91 |  |  |
Debt securities, amortized cost | $ 136,955,000 | 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 | 1 |  |  |
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 |  |  |
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 | 150 |  |  |
Debt securities, amortized cost | $ 237,210,000 | 181,785,000 |  |
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 | 42 |  |  |
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 | 27 |  |  |
Private label residential mortgage and asset backed securities |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |
Unrealized gain (loss) on available for sale portfolio | $ (352,000) |  |  |
Available-for-sale Securities, Number of Positions | security | 30 |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security | 17 |  |  |
Debt securities, amortized cost | $ 91,033,000 | $ 1,807,000 |  |
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 | 10 |  |  |
Debt securities, amortized cost | $ 1,359,000 |  |  |

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