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Derivative Financial Instruments (Narrative Disclosures) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Derivatives |  |  |  |  |
Interest Rate Swaps, Default | $ 0 |  | $ 0 |  |
Interest rate swap contracts not designated as hedging instruments - liabilities, gross | 23,128,000 |  | 23,128,000 |  | $ 4,637,000
Fair value of interest rate swaps | 23,128,000 |  | 23,128,000 |  | $ 4,637,000
Derivative asset, fair value, amount offset against collateral | 0 |  | 0 |  |
Pretax unrealized gain on interest rates swaps designated as cash flow hedges | (846,000) | $ 382,000 | (3,310,000) | $ 1,412,000 |
Gain recognized in income on ineffective portion of hedges |  |  | 0 |  |
To commercial borrowers, corporation receives fixed rates and pays floating rates |  |  |  |  |
Derivatives |  |  |  |  |
Fair value of interest rate swaps | 23,100,000 |  | $ 23,100,000 |  |
To commercial borrowers, corporation receives fixed rates and pays floating rates | Minimum |  |  |  |  |
Derivatives |  |  |  |  |
Derivative, maturity date |  |  | Mar. 31, 2021 |  |
To commercial borrowers, corporation receives fixed rates and pays floating rates | Maximum |  |  |  |  |
Derivatives |  |  |  |  |
Derivative, maturity date |  |  | Jul. 15, 2034 |  |
To dealer countparties, corporation pays fixed rates and receives floating rates |  |  |  |  |
Derivatives |  |  |  |  |
Interest rate swap contracts not designated as hedging instruments - liabilities, gross | 23,100,000 |  | $ 23,100,000 |  |
Fair value of interest rate swaps | 0 |  | 0 |  |
Interest rate derivative instruments not designated as hedging instruments at fair value, net | 23,100,000 |  | $ 23,100,000 |  |
To dealer countparties, corporation pays fixed rates and receives floating rates | Minimum |  |  |  |  |
Derivatives |  |  |  |  |
Derivative, maturity date |  |  | Mar. 31, 2021 |  |
To dealer countparties, corporation pays fixed rates and receives floating rates | Maximum |  |  |  |  |
Derivatives |  |  |  |  |
Derivative, maturity date |  |  | Jul. 15, 2034 |  |
Interest rate swaps | Minimum |  |  |  |  |
Derivatives |  |  |  |  |
Derivative, maturity date |  |  | Dec. 31, 2021 |  |
Interest rate swaps | Maximum |  |  |  |  |
Derivatives |  |  |  |  |
Derivative, maturity date |  |  | Dec. 31, 2027 |  |
Not Designated as Hedging Instrument | To commercial borrowers, corporation receives fixed rates and pays floating rates |  |  |  |  |
Derivatives |  |  |  |  |
Derivative, Notional Amount | 256,400,000 |  | $ 256,400,000 |  |
Not Designated as Hedging Instrument | To dealer countparties, corporation pays fixed rates and receives floating rates |  |  |  |  |
Derivatives |  |  |  |  |
Derivative, Notional Amount | 256,400,000 |  | 256,400,000 |  |
Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |
Derivatives |  |  |  |  |
Derivative, Notional Amount | $ 54,000,000 |  | $ 54,000,000 |  |

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