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Derivative Financial Instruments (Narrative Disclosures) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Derivatives |  |
Derivative credit valuation adjustment | $ 461,000 | $ 0
Interest Rate Swaps, Default | 0 |
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax | 3,011,000 | $ 2,396,000
Ineffective portion of hedges | 0 |
To commercial borrowers, corporation receives fixed rates and pays floating rates |  |
Derivatives |  |
Interest rate swaps - assets | 49,400,000 |
Interest rate swaps - liabilities | 58,000 |
To dealer countparties, corporation pays fixed rates and receives floating rates |  |
Derivatives |  |
Interest rate swaps - assets | 58,000 |
Interest rate swaps - liabilities | 49,400,000 |
Interest rate derivative instruments not designated as hedging instruments at fair value, net | (49,300,000) |
Not designated as hedging instrument | To commercial borrowers, corporation receives fixed rates and pays floating rates |  |
Derivatives |  |
Derivative, Notional Amount | 629,100,000 |
Not designated as hedging instrument | To dealer countparties, corporation pays fixed rates and receives floating rates |  |
Derivatives |  |
Derivative, Notional Amount | 629,100,000 |
Designated as Hedging Instrument | Interest rate swaps |  |
Derivatives |  |
Derivative, Notional Amount | $ 114,000,000.0 |

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- Definition The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1),(2) -URI http://asc.fasb.org/extlink&oid=121577467&loc=d3e76258-113986 + Details
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