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Business Combinations and Divestitures - Schedule of Pro Forma Information on Acquisition (Details) - ColoEast Bankshares, Inc. - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Business Acquisition, Pro Forma Information [Abstract] |  |
Net interest income | $ 128,322 | $ 117,051
Noninterest income | 22,671 | 36,539
Net income | $ 21,220 | $ 31,624
Basic earnings per common share | $ 1.14 | $ 1.73
Diluted earnings per common share | $ 1.13 | $ 1.70

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- Definition The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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