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Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | 15.00% |  |
Defined Contribution Plan, Employer Contributions, Vesting Period | 5 years |  |
Defined Contribution Plan, Cost | $ 730 | $ 738 |
Defined Benefit Plan, Benefit Obligation | 7,515 | 7,186 | $ 8,465
Defined Benefit Plan, Net Periodic Benefit Cost | (12) | (98) |
Defined Benefit Plan, Benefits Paid | 553 | 582 |
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months | 477 |  |
Defined Benefit Plan, Expected Future Benefit Payments, Year Five | 466 |  |
Defined Benefit Plan, Expected Future Benefit Payments, Year Four | 4,670 |  |
Defined Benefit Plan, Expected Future Benefit Payments, Year Three | 453 |  |
Defined Benefit Plan, Expected Future Benefit Payments, Year Two | 438 |  |
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter | 2,115 |  |
Change in Projected Benefit Obligation from Change in Projected Discount Rate | 801 |  |
Defined Benefit Plan, Accumulated Benefit Obligation | $ 7,515 | $ 7,186 |
Defined Benefit Plan, Target Plan Asset Allocations | 100.00% | 100.00% |
Accumulated Postretirement Benefit Obligation | $ 1,392 | $ 1,291 |
Multiemployer Plans, Postretirement Benefit [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost | 29 | 46 |
Defined Benefit Plan, Contributions by Employer | $ 29 | $ 46 |
Defined Benefit Plan, Percentage of Plan Funded | 95.00% | 91.40% |
Defined Benefit Plan, Contribution Percentage | 5.00% |  |
Supplemental Employee Retirement Plan, Defined Benefit [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation | $ 3,428 | $ 3,362 |
Pension and Other Postretirement Benefits Cost (Reversal of Cost) | 491 | 434 |
Cash Surrender Value of Life Insurance | 38,763 | 37,932 |
Defined Benefit Plan, Net Periodic Benefit Cost | $ 101 | $ 149 |
Cash And Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 0.00% | 4.20% |
Domestic equities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 31.70% | 46.10% |
Fixed Income Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 57.70% | 45.80% |
Other Investments [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 10.60% | 3.90% |
Commingled Pensions Trust Fund [Member] | Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 10.00% |  |
Commingled Pensions Trust Fund [Member] | Minimum [Member] | Global Equity, Global Fixed Income, Real Estate And Cash-Plus [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 35.00% |  |
Commingled Pensions Trust Fund [Member] | Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 65.00% |  |
Commingled Pensions Trust Fund [Member] | Maximum [Member] | Global Equity, Global Fixed Income, Real Estate And Cash-Plus [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Target Plan Asset Allocations | 90.00% |  |
Delaware Bancshares, Inc. [Member] | Director Fee Deferral and Continuation Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Benefit Obligation | $ 166 | $ 249 |
Pension and Other Postretirement Benefits Cost (Reversal of Cost) | $ 3 | $ 6 |
Delaware Bancshares, Inc. [Member] | Director Fee Deferral and Continuation Plan [Member] | Minimum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit Payment Period | 5 years |  |
Delaware Bancshares, Inc. [Member] | Director Fee Deferral and Continuation Plan [Member] | Maximum [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Benefit Payment Period | 15 years |  |

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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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