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Derivative Financial Instruments (Narrative Disclosures) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Derivatives |  |
Interest rate swaps - assets |  | $ 4,637,000
Interest rate swaps - liabilities | $ 18,346,000 | 4,637,000
Interest Rate Swaps, Default | 0 |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax | (2,396,000) | $ (20,000)
Ineffective portion of hedges | 0 |
To commercial borrowers, corporation receives fixed rates and pays floating rates |  |
Derivatives |  |
Interest rate swaps - assets | 18,300,000 |
Interest rate swaps - liabilities | $ 64,000 |
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 | Oct. 31, 2036 |
To dealer countparties, corporation pays fixed rates and receives floating rates |  |
Derivatives |  |
Interest rate swaps - assets | $ 64,000 |
Interest rate swaps - liabilities | 18,300,000 |
Interest rate derivative instruments not designated as hedging instruments at fair value, net | $ (18,300,000) |
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 | Oct. 31, 2036 |
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 | $ 326,900,000 |
Not designated as hedging instrument | To dealer countparties, corporation pays fixed rates and receives floating rates |  |
Derivatives |  |
Derivative, Notional Amount | 326,900,000 |
Designated as Hedging Instrument [Member] | Interest rate swaps |  |
Derivatives |  |
Derivative, Notional Amount | $ 54,000,000 |

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