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Investments - Textual (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2015 USD ($) security investments | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) security investments | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale Securities Pledged as Collateral | $ 126,238 |  | $ 126,238 |  |
Available-for-sale Securities, Gross Unrealized Gain (Loss) |  |  | 8,114 | $ 8,896 |
Income tax impact from the reclassification of unrealized net gains on available-for-sale securities to realized net gains on available-for-sale securities | 0 | $ 99 | 601 | 236 |
Debt securities, amortized cost | 444,728 |  | 444,728 |  |
Transfer of securities from available-for-sale to held-to-maturity |  |  | 0 | 31,346 | $ 31,346
Fair value of held-to-maturity investment securities transferred |  |  |  |  | 32,047
Unrealized gain on transfer of securities from available-for-sale to held-to-maturity |  |  | 0 | $ 163 | 163
AOCI available-for-sale securities adjustment tax | 3,339 |  | 3,339 |  | 3,661
Unaccreted balance | $ 138 |  | $ 138 |  | 142
U.S. Government agencies |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale Securities, Number of Positions | security | 15 |  | 15 |  |
Debt securities, amortized cost | $ 51,679 |  | $ 51,679 |  | 33,088
Obligations of states and political subdivisions |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale Securities, Number of Positions | security | 150 |  | 150 |  |
Debt securities, amortized cost | $ 174,758 |  | $ 174,758 |  | 143,343
U.S. Government agencies collateralized by residential mortgage obligations |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale Securities, Number of Positions | security | 180 |  | 180 |  |
Debt securities, amortized cost | $ 208,318 |  | $ 208,318 |  | 236,629
Private label residential mortgage backed securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale Securities, Gross Unrealized Gain (Loss) |  |  | $ 1,272 |  |
Available-for-sale Securities, Number of Positions | security | 17 |  | 17 |  |
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security | 0 |  | 0 |  |
Debt securities, amortized cost | $ 2,473 |  | $ 2,473 |  | 3,079
Other equity securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available For Sale Securities, Number of Securities | investments | 1 |  | 1 |  |
Available-for-sale Equity Securities, Amortized Cost Basis | $ 7,500 |  | $ 7,500 |  | $ 7,500
Less than 12 months | U.S. Government agencies |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security | 4 |  | 4 |  |
Less than 12 months | Obligations of states and political subdivisions |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security | 25 |  | 25 |  |
Less than 12 months | U.S. Government agencies collateralized by residential mortgage obligations |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security | 15 |  | 15 |  |
Greater than 12 months | U.S. Government agencies |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security | 1 |  | 1 |  |
Greater than 12 months | Obligations of states and political subdivisions |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security | 0 |  | 0 |  |
Greater than 12 months | U.S. Government agencies collateralized by residential mortgage obligations |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security | 11 |  | 11 |  |
Below investment grade | Private label residential mortgage backed securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale Securities, Number of Positions | security | 9 |  | 9 |  |
Debt securities, amortized cost | $ 2,155 |  | $ 2,155 |  |

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