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Investments - Textual (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 USD ($) security investments | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) security investments | Jun. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale Securities Pledged as Collateral | $ 112,265,000 |  | $ 112,265,000 |  |
Available-for-sale Securities, Gross Unrealized Gain (Loss) |  |  | 4,168,000 | $ 8,896,000 |
Income tax impact from the reclassification of unrealized net gains on available-for-sale securities to realized net gains on available-for-sale securities | 301,000 | $ 26,000 | 601,000 | 137,000 |
Debt securities, amortized cost | 426,092,000 |  | 426,092,000 |  |
Transfer of securities from available-for-sale to held-to-maturity |  |  | 0 | 31,346,000 | $ 31,346,000
Fair value of held-to-maturity investment securities transferred |  |  |  |  | 32,047,000
Unrealized gain on transfer of securities from available-for-sale to held-to-maturity |  |  | 0 | $ 163,000 | 163,000
AOCI available-for-sale securities adjustment tax | 1,715,000 |  | 1,715,000 |  | 3,661,000
Unaccreted balance | $ 140,000 |  | $ 140,000 |  | 142,000
U.S. Government agencies |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale Securities, Number of Positions | security | 14 |  | 14 |  |
Debt securities, amortized cost | $ 49,663,000 |  | $ 49,663,000 |  | 33,088,000
Obligations of states and political subdivisions |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale Securities, Number of Positions | security | 145 |  | 145 |  |
Debt securities, amortized cost | $ 161,817,000 |  | $ 161,817,000 |  | 143,343,000
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 | $ 204,476,000 |  | $ 204,476,000 |  | 236,629,000
Private label residential mortgage backed securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale Securities, Gross Unrealized Gain (Loss) |  |  | $ 1,624,000 |  |
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 | $ 2,636,000 |  | $ 2,636,000 |  | 3,079,000
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 | $ 7,500,000 |  | $ 7,500,000 |  | $ 7,500,000
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 | 32 |  | 32 |  |
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 | 18 |  | 18 |  |
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 | 0 |  | 0 |  |
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 | 13 |  | 13 |  |
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 | $ 2,234,000 |  | $ 2,234,000 |  |

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