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Derivative Financial Instruments (Narrative Disclosures) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Derivatives |  |  |  |  |
Fair value of interest rate swaps | $ 16,409,000 |  | $ 16,409,000 |  | $ 4,637,000
Interest rate swap contracts not designated as hedging instruments - liabilities, gross | 16,409,000 |  | 16,409,000 |  | $ 4,637,000
Interest Rate Swaps, Default | 0 |  | 0 |  |
Derivative asset, fair value, amount offset against collateral | 0 |  | 0 |  |
Pretax unrealized gain on interest rates swaps designated as cash flow hedges | (1,514,000) | $ 358,000 | (2,464,000) | $ 1,030,000 |
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 | 16,400,000 |  | 16,400,000 |  |
Interest rate swap contracts not designated as hedging instruments - liabilities, gross | 183,000 |  | $ 183,000 |  |
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 |  |  |  |  |
Fair value of interest rate swaps | 183,000 |  | $ 183,000 |  |
Interest rate swap contracts not designated as hedging instruments - liabilities, gross | 16,400,000 |  | 16,400,000 |  |
Interest rate derivative instruments not designated as hedging instruments at fair value, net | 16,200,000 |  | $ 16,200,000 |  |
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 |  |  |  |  |
Notional value of interest rate swaps with various commercial borrowers | 237,700,000 |  | $ 237,700,000 |  |
Not Designated as Hedging Instrument | To dealer countparties, corporation pays fixed rates and receives floating rates |  |  |  |  |
Derivatives |  |  |  |  |
Notional value of interest rate swaps with various commercial borrowers | 237,700,000 |  | 237,700,000 |  |
Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |
Derivatives |  |  |  |  |
Notional value of interest rate swaps with various commercial borrowers | $ 54,000,000 |  | $ 54,000,000 |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value, after effects of master netting arrangements, of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against an obligation to return collateral. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226016-175313 + Details
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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=109980867&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=109977999&loc=d3e76258-113986 + Details
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