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Income Taxes (Schedule of Reconciliation of Expected Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | [1] | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected income tax expense |  |  |  |  |  |  |  |  | $ 7,633 |  | $ 12,214 |  | $ 11,223 |
(Reductions) increases resulting from: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt income |  |  |  |  |  |  |  |  | (2,009) |  | (3,868) |  | (3,754) |
State taxes, net of federal benefit |  |  |  |  |  |  |  |  | 732 |  | 896 |  | 623 |
Share-based compensation adjustment |  |  |  |  |  |  |  |  | (286) |  | (376) |  |  |
Adjustment of deferred tax asset or liability for TCJA |  |  |  |  |  |  |  |  | (74) |  | 1,824 |  |  |
Other, net |  |  |  |  |  |  |  |  | 83 |  | (805) |  | (376) |
Total income tax expense | $ 1,502 | $ 1,481 | $ 1,387 | $ 1,709 | $ 3,576 | $ 2,396 | $ 2,248 | $ 1,665 | $ 6,079 | [2] | $ 9,885 | [1],[2] | $ 7,716 | [2]
[1] | Includes one-time, non-cash TCJA charge of $1,824,000
[2] | Presented on a tax-equivalent basis assuming a tax rate of 21% for 2018 and 35% for 2017 and 2016. The tax-equivalent adjustment was approximately $2,422,000 for 2018, $5,691,000 for 2017, and $5,550,000 for 2016.

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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- Definition Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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