Securities (Details Textual) $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) Security	Dec. 31, 2016 USD ($)
Securities [Line Items]
Estimated fair value, securities pledged	$ 351,800	$ 178,700
Mortgage Backed Securities, Other [Member]
Securities [Line Items]
Estimated fair value, securities pledged	$ 47,400	6,900
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Securities [Line Items]
Number of securities in unrealized loss position \| Security	59
Unrealized loss on securities	$ 2,600
CRA Mutual Fund [Member]
Securities [Line Items]
Number of securities in unrealized loss position \| Security	1
Estimated fair value, securities pledged	$ 1,400
Unrealized loss on securities	121
Repurchase Agreements [Member]
Securities [Line Items]
Estimated fair value, securities pledged	63,300	21,400
Obligations outstanding on repurchase agreements	$ 51,100	17,000
Corporate Bond Securities [Member]
Securities [Line Items]
Number of securities in unrealized loss position, held to maturity \| Security	1
Estimated fair value, securities pledged	$ 1,700	5,900
Unrealized loss on securities	9
Municipal Bonds [Member]
Securities [Line Items]
Estimated fair value, securities pledged	$ 11,600	4,700
Held-to-maturity Securities [Member] \| US Government Agencies Short-term Debt Securities [Member]
Securities [Line Items]
Number of securities in unrealized loss position \| Security	27
Unrealized loss on securities	$ 1,200
Held-to-maturity Securities [Member] \| Taxable Municipal Notes [Member]
Securities [Line Items]
Number of securities in unrealized loss position, held to maturity \| Security	2
Unrealized loss on securities	$ 26
Available-for-sale Securities [Member] \| US Government Agencies Short-term Debt Securities [Member]
Securities [Line Items]
Number of securities in unrealized loss position \| Security	1
Unrealized loss on securities	$ 21
Asset-backed Securities [Member]
Securities [Line Items]
Number of securities in unrealized loss position \| Security	13
Estimated fair value, securities pledged	$ 1,200	$ 2,500
Unrealized loss on securities	$ 511

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- Definition

Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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- Definition

Disclosure regarding factors used to determine that the impairment of securities categorized as held-to-maturity where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the held-to-maturity investments determined to be temporarily impaired.

+ References

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- Definition

The fair value, as of the date of each statement of financial position presented, of securities that are restricted as collateral for the payment of other debt obligations, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728

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- Definition

The fair value, as of the date of each statement of financial position presented, of securities which are owned but transferred to serve as collateral for the payment of repurchase agreements, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them.

+ References

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- Definition

Amount of unrealized gain (loss) recognized in the income statement on unsold other securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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