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Summary of Significant Accounting Policies - Premises and Equipment (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Line Items] |  |
Debt Securities, Available-for-sale | $ 88,179,000 | $ 93,383,000
Transfer of Property to Held-for-sale | 0 | 5,677,000
Premises held-for-sale | 0 | 5,667,000
Gain on sale of premises held-for-sale | $ 93,000 | $ 0
Building and building improvements [Member] | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Premises and Equipment, Useful life | 25 years |
Building and building improvements [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Premises and Equipment, Useful life | 40 years |
Building Improvements [Member] | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Premises and Equipment, Useful life | 10 years |
Building Improvements [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Premises and Equipment, Useful life | 20 years |
Furniture and equipment [Member] | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Premises and Equipment, Useful life | 5 years |
Furniture and equipment [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Premises and Equipment, Useful life | 15 years |
Computer Equipment And Software [Member] | Minimum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Premises and Equipment, Useful life | 2 years |
Computer Equipment And Software [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Premises and Equipment, Useful life | 5 years |
Automobiles [Member] | Maximum [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Premises and Equipment, Useful life | 4 years |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of investments in land and buildings held for sale, excluding real estate considered to be inventory of the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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