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Fair Value (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Fair value measurement |  |
Securities available-for-sale | $ 901,550 | $ 897,053
US Government Agencies Debt Securities [Member] |  |
Fair value measurement |  |
Securities available-for-sale | 1,359 | 1,467
Mortgage Backed Securities - Residential |  |
Fair value measurement |  |
Securities available-for-sale | 188,747 | 187,936
Mortgage Backed Securities - Commercial |  |
Fair value measurement |  |
Securities available-for-sale | 13 | 17
Collateralized Mortgage Obligations |  |
Fair value measurement |  |
Securities available-for-sale | 484,795 | 484,655
State and Municipal Obligations |  |
Fair value measurement |  |
Securities available-for-sale | 211,770 | 207,675
Collateralized Debt Obligations |  |
Fair value measurement |  |
Securities available-for-sale | 14,866 | 15,303
Fair Value, Inputs, Level 1 [Member] |  |
Fair value measurement |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 1 [Member] | US Government Agencies Debt Securities [Member] |  |
Fair value measurement |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Mortgage Backed Securities - Residential |  |
Fair value measurement |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Mortgage Backed Securities - Commercial |  |
Fair value measurement |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Collateralized Mortgage Obligations |  |
Fair value measurement |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 1 [Member] | State and Municipal Obligations |  |
Fair value measurement |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Collateralized Debt Obligations |  |
Fair value measurement |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Fair value measurement |  |
Securities available-for-sale | 881,959 | 875,850
Derivative Assets | 997 | 1,062
Derivative Liability | (997) | (1,062)
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member] |  |
Fair value measurement |  |
Securities available-for-sale | 1,359 | 1,467
Fair Value, Inputs, Level 2 [Member] | Mortgage Backed Securities - Residential |  |
Fair value measurement |  |
Securities available-for-sale | 188,747 | 187,936
Fair Value, Inputs, Level 2 [Member] | Mortgage Backed Securities - Commercial |  |
Fair value measurement |  |
Securities available-for-sale | 13 | 17
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations |  |
Fair value measurement |  |
Securities available-for-sale | 484,795 | 484,655
Fair Value, Inputs, Level 2 [Member] | State and Municipal Obligations |  |
Fair value measurement |  |
Securities available-for-sale | 207,045 | 201,775
Fair Value, Inputs, Level 2 [Member] | Collateralized Debt Obligations |  |
Fair value measurement |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Fair value measurement |  |
Securities available-for-sale | 19,591 | 21,203
Fair Value, Inputs, Level 3 [Member] | US Government Agencies Debt Securities [Member] |  |
Fair value measurement |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Mortgage Backed Securities - Residential |  |
Fair value measurement |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Mortgage Backed Securities - Commercial |  |
Fair value measurement |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Collateralized Mortgage Obligations |  |
Fair value measurement |  |
Securities available-for-sale | 0 | 0
Fair Value, Inputs, Level 3 [Member] | State and Municipal Obligations |  |
Fair value measurement |  |
Securities available-for-sale | 4,725 | 5,900
Fair Value, Inputs, Level 3 [Member] | Collateralized Debt Obligations |  |
Fair value measurement |  |
Securities available-for-sale | $ 14,866 | $ 15,303

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