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Earnings Per Share - Factors Used in Computation of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Basic |  |  |  |  |  |  |  |  |  |  |
Net income to common stockholders | $ 6,111 | $ 9,587 | $ 9,467 | $ 10,281 | $ 6,064 | $ 4,506 | $ 4,431 | $ 4,812 | $ 35,446 | $ 19,813 | $ 28,353
Weighted average common shares outstanding |  |  |  |  |  |  |  |  | 19,133,745 | 17,856,828 | 17,720,479
Basic earnings per common share | $ 0.29 | $ 0.48 | $ 0.53 | $ 0.57 | $ 0.34 | $ 0.25 | $ 0.25 | $ 0.27 | $ 1.85 | $ 1.11 | $ 1.60
Diluted |  |  |  |  |  |  |  |  |  |  |
Net income to common stockholders | $ 6,111 | $ 9,587 | $ 9,467 | $ 10,281 | $ 6,064 | $ 4,506 | $ 4,431 | $ 4,812 | $ 35,446 | $ 19,813 | $ 28,353
Dilutive effect of preferred stock |  |  |  |  |  |  |  |  | 774 |  | 780
Net income to common stockholders - diluted |  |  |  |  |  |  |  |  | $ 36,220 | $ 19,813 | $ 29,133
Weighted average common shares outstanding |  |  |  |  |  |  |  |  | 19,133,745 | 17,856,828 | 17,720,479
Dilutive effects of: |  |  |  |  |  |  |  |  |  |  |
Average shares and dilutive potential common shares |  |  |  |  |  |  |  |  | 20,000,288 | 18,053,531 | 18,524,889
Diluted earnings per common share | $ 0.29 | $ 0.47 | $ 0.51 | $ 0.55 | $ 0.33 | $ 0.25 | $ 0.25 | $ 0.27 | $ 1.81 | $ 1.10 | $ 1.57
Restricted Stock |  |  |  |  |  |  |  |  |  |  |
Dilutive effects of: |  |  |  |  |  |  |  |  |  |  |
Stock based compensation |  |  |  |  |  |  |  |  | 68,079 | 110,565 | 79,821
Stock Options |  |  |  |  |  |  |  |  |  |  |
Dilutive effects of: |  |  |  |  |  |  |  |  |  |  |
Stock based compensation |  |  |  |  |  |  |  |  | 45,653 | 3,128 |
Antidilutive shares |  |  |  |  |  |  |  |  | 57,926 |  |
Series A Preferred Dividends |  |  |  |  |  |  |  |  |  |  |
Dilutive effects of: |  |  |  |  |  |  |  |  |  |  |
Assumed conversion of shares |  |  |  |  |  |  |  |  | 315,773 |  | 315,773
Antidilutive shares |  |  |  |  |  |  |  |  |  | 315,773 |
Series B Preferred Dividends |  |  |  |  |  |  |  |  |  |  |
Dilutive effects of: |  |  |  |  |  |  |  |  |  |  |
Assumed conversion of shares |  |  |  |  |  |  |  |  | 354,471 |  | 360,578
Antidilutive shares |  |  |  |  |  |  |  |  |  | 360,578 |
Warrant |  |  |  |  |  |  |  |  |  |  |
Dilutive effects of: |  |  |  |  |  |  |  |  |  |  |
Assumed exercises of stock warrants |  |  |  |  |  |  |  |  | 82,567 | 83,010 | 48,238

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- Definition The after-tax amount of any dividends on convertible preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1505-109256 + Details
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=96948231&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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