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Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Fair value measurement |  |
Securities available-for-sale | $ 785,693 | $ 814,931
US Government Agencies Debt Securities [Member] |  |
Fair value measurement |  |
Securities available-for-sale | 12,473 | 13,695
Mortgage Backed Securities - Residential |  |
Fair value measurement |  |
Securities available-for-sale | 184,651 | 215,338
Mortgage Backed Securities - Commercial |  |
Fair value measurement |  |
Securities available-for-sale |  | 1
Collateralized Mortgage Obligations |  |
Fair value measurement |  |
Securities available-for-sale | 354,547 | 339,670
State and Municipal Obligations |  |
Fair value measurement |  |
Securities available-for-sale | 230,599 | 231,622
Collateralized Debt Obligations |  |
Fair value measurement |  |
Securities available-for-sale | 3,423 | 14,605
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
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 | 779,135 | 796,646
Derivative Assets | 687 | 298
Derivative Liability | (687) | (298)
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member] |  |
Fair value measurement |  |
Securities available-for-sale | 12,473 | 13,695
Fair Value, Inputs, Level 2 [Member] | Mortgage Backed Securities - Residential |  |
Fair value measurement |  |
Securities available-for-sale | 184,651 | 215,338
Fair Value, Inputs, Level 2 [Member] | Mortgage Backed Securities - Commercial |  |
Fair value measurement |  |
Securities available-for-sale |  | 1
Fair Value, Inputs, Level 2 [Member] | Collateralized Mortgage Obligations |  |
Fair value measurement |  |
Securities available-for-sale | 354,547 | 339,670
Fair Value, Inputs, Level 2 [Member] | State and Municipal Obligations |  |
Fair value measurement |  |
Securities available-for-sale | 227,464 | 227,942
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 | 6,558 | 18,285
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
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 | 3,135 | 3,680
Fair Value, Inputs, Level 3 [Member] | Collateralized Debt Obligations |  |
Fair value measurement |  |
Securities available-for-sale | $ 3,423 | $ 14,605

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