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Business Combinations (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 1 Months Ended | 12 Months Ended |
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Aug. 15, 2017 | Jun. 01, 2016 | Oct. 01, 2015 | Jun. 19, 2015 | Aug. 11, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 38,201 | $ 37,164
Monitor Bancorp, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition | Aug. 15, 2017 |  |  |  |  |  |
Shares of stock issued for acquisition | 465,787 |  |  |  |  |  |
Fair value of total consideration transferred | $ 7,512 |  |  |  |  |  |
Maximum shares exchanged for stock | 85.00% |  |  |  |  |  |
Maximum shares exchanged for cash | 15.00% |  |  |  |  |  |
Cash consideration per share | $ 769.38 |  |  |  |  |  |
Multiplier used to calculate per share cash consideration | 1.25 |  |  |  |  |  |
Period of trading days considered for volume weighted average closing price |  |  |  |  | 20 days |  |
Volume weighted average closing price per share of common shares | $ 14.04 |  |  |  |  |  |
Final stock exchange ratio | 54.80 |  |  |  |  |  |
Goodwill | $ 1,037 |  |  |  |  |  |
Monitor Bancorp, Inc. | Core Deposits |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of other intangible assets | $ 673 |  |  |  |  |  |
Bowers Insurance Agency, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  |  |  | Jun. 01, 2016 |
Shares of stock issued for acquisition |  | 123,280 |  |  |  |  |
Fair value of total consideration transferred |  | $ 3,155 |  |  |  |  |
Goodwill |  | 1,849 |  |  |  |  |
Fair value of other intangible assets |  | 1,630 |  |  |  |  |
Contingent future payments |  | 1,200 |  |  |  |  |
Contingent consideration |  | $ 880 |  |  |  | $ 316 |
Contingent consideration future payment liability |  |  |  |  |  | 200 |
Reduction to acquisition related costs |  |  |  |  |  | 364 |
Bowers Insurance Agency, Inc. | Earnout Payment |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Contingent consideration |  |  |  |  |  | $ 564 |
Tri-State 1st Banc Incorporation |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  | Oct. 01, 2015 |  |  |  |
Shares of stock issued for acquisition |  |  | 1,296,517 |  |  |  |
Fair value of total consideration transferred |  |  | $ 14,300 |  |  |  |
Cash consideration per share |  |  | $ 14.20 |  |  |  |
Goodwill |  |  | $ 3,000 |  |  |  |
Shares shareholders are entitled to elect to receive per shares |  |  | 174.70% |  |  |  |
Business Acquisition Shares Being Exchanged for Stock |  |  | 75.00% |  |  |  |
Business Acquisition Shares Being Exchanged for Cash |  |  | 25.00% |  |  |  |
Tri-State 1st Banc Incorporation | Series A Preferred Stock |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash consideration per share |  |  | $ 13.60 |  |  |  |
Tri-State 1st Banc Incorporation | Core Deposits |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of other intangible assets |  |  | $ 1,200 |  |  |  |
National Bancshares Corporation |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business Acquisition, Effective Date of Acquisition |  |  |  | Jun. 19, 2015 |  |  |
Shares of stock issued for acquisition |  |  |  | 7,262,955 |  |  |
Fair value of total consideration transferred |  |  |  | $ 74,800 |  |  |
Maximum shares exchanged for stock |  |  |  | 80.00% |  |  |
Maximum shares exchanged for cash |  |  |  | 20.00% |  |  |
Cash consideration per share |  |  |  | $ 32.15 |  |  |
Goodwill |  |  |  | $ 26,700 |  |  |
Shares shareholders are entitled to elect to receive per shares |  |  |  | 403.40% |  |  |
National Bancshares Corporation | Core Deposits |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Fair value of other intangible assets |  |  |  | $ 4,400 |  |  |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + Details
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