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Represents the number of depository branches.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
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Cash deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 305
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6478312&loc=d3e61473-112792

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

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Description of Business and Summary of Significant Accounting Policies (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) depository_branch	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Accounting Policies [Abstract]
Percentage of capital stock of the Bank held		100.00%
Number of depository branches \| depository_branch		33
Cash and Cash Equivalents
Cash reserves required by the Board of Governors of the Federal Reserve for depository institutions (in dollars)		$ 0
Premises, furniture and equipment
Valuation allowance		380,000	$ 0	$ 0
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation		$ 1,995,000	$ 0	$ 0
Subsequent Event
Premises, furniture and equipment
Reclassification from retained earnings to AOCI	$ 81,000
Core Deposits \| Minimum
Premises, furniture and equipment
Weighted average useful life (in years)		6 years
Core Deposits \| Maximum
Premises, furniture and equipment
Weighted average useful life (in years)		10 years
Premises
Premises, furniture and equipment
Estimated useful life (in years)		40 years
Furniture, fixtures and equipment
Premises, furniture and equipment
Estimated useful life (in years)		7 years
Computer and telecommunication
Premises, furniture and equipment
Estimated useful life (in years)		3 years