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Investments - Textual (Details) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2016 USD ($) security | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 investments
Schedule of Available-for-sale Securities |  |  |  |  |
Other than temporary impairment losses on investment securities | $ 136,000 | $ 0 |  |  |
Available-for-sale Securities Pledged as Collateral | 114,784,000 |  |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax | 13,553,000 |  |  | $ 7,474,000 |
Income tax impact from the reclassification of unrealized net gains on available-for-sale securities to realized net gains on available-for-sale securities | 465,000 | $ 299,000 |  |  |
Debt securities, amortized cost | 488,425,000 |  |  |  |
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 |  | 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 |  |  |  |
Held-to-maturity Securities, Sold Security, Realized Gain (Loss) | $ 696,000 |  |  |  |
AOCI available-for-sale securities adjustment tax | 5,578,000 |  |  | 3,076,000 |
Unaccreted balance | $ 0 |  |  | 64,000 |
U.S. Government agencies |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale Securities, Number of Positions | security | 17 |  |  |  |
Debt securities, amortized cost | $ 51,194,000 |  |  | 52,803,000 |
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 |  |  |  |
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 | 148 |  |  |  |
Debt securities, amortized cost | $ 204,242,000 |  |  | 181,785,000 |
U.S. Government agencies collateralized by residential mortgage obligations |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale Securities, Number of Positions | security | 179 |  |  |  |
Debt securities, amortized cost | $ 223,234,000 |  |  | 225,636,000 |
Private label residential mortgage backed securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax | $ 1,119,000 |  |  |  |
Available-for-sale Securities, Number of Positions | security | 17 |  |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security | 0 |  |  |  |
Debt securities, amortized cost | $ 2,255,000 |  |  | 2,356,000 |
Other equity securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available For Sale Securities, Number of Securities | investments |  |  |  |  | 1
Available-for-sale Equity Securities, Amortized Cost Basis | $ 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 |  |  |  |
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 | 6 |  |  |  |
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 | 31 |  |  |  |
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 |  |  |  |
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 | 2 |  |  |  |
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 |  |  |  |
Below investment grade | Private label residential mortgage backed securities |  |  |  |  |
Schedule of Available-for-sale Securities |  |  |  |  |
Available-for-sale Securities, Number of Positions | security | 12 |  |  |  |
Debt securities, amortized cost | $ 2,027,000 |  |  |  |

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