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Derivative Financial Instruments and Hedging Activities - Narrative (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 USD ($) derivative | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) derivative | Jun. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Derivatives, Fair Value [Line Items] |  |  |  |  |
Lower threshold requiring collateral to be posted, liabilities | $ 100,000 |  | $ 100,000 |  |
Higher threshold requiring collateral to be posted, liabilities | 250,000.00 |  | 250,000.00 |  |
Fair value hedge |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Net hedge ineffectiveness, derivatives | 70,000 | $ 15,000 | 58,000 | $ 173,000 |
Designated as hedging instrument | Fair value hedge |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Accrued interest on swaps | $ 36,000 |  | $ 36,000 |  | $ 41,000
Interest rate swap | Designated as hedging instrument | Fair value hedge |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Number of derivative instruments qualifying for short-cut hedge treatment | derivative | 1 |  | 1 |  |
Number of derivative instruments | derivative | 8 |  | 8 |  |
Interest rate swap | Designated as hedging instrument | Fair value hedge | Other assets |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Interest rate contracts notional amount, Asset derivatives | $ 4,499,000 |  | $ 4,499,000 |  | 4,589,000
Interest rate swap | Designated as hedging instrument | Fair value hedge | Other liabilities |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Interest rate contracts notional amount, Liability derivatives | 26,000,000 |  | 26,000,000 |  | 26,899,000
Interest income | Fair value hedge |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Increase (decrease) in value of designated interest rate swaps recognized in interest income | 966,000 | (423,000) | 420,000 | 313,000 |
Payment on interest rate swaps recorded in interest income | (233,000) | (252,000) | (469,000) | (505,000) |
(Decrease) increase in value of hedged loans recognized in interest income | (1,023,000) | 453,000 | (451,000) | (78,000) |
Decrease in value of yield maintenance agreement recognized against interest income | (13,000) | (15,000) | (27,000) | (62,000) |
Net loss on derivatives recognized against interest income | (303,000) | $ (237,000) | (527,000) | $ (332,000) |
Assets and liabilities at fair value measured on a recurring basis | Interest rate contract | Designated as hedging instrument | Fair value hedge | Other assets |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Interest rate contracts fair value, Asset derivatives | 116,000 |  | 116,000 |  | 61,000
Assets and liabilities at fair value measured on a recurring basis | Interest rate contract | Designated as hedging instrument | Fair value hedge | Other liabilities |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Interest rate contracts fair value, Liability derivatives | $ 1,631,000 |  | $ 1,631,000 |  | $ 1,996,000

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