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Note 20 - Parent Company Only Financial Statements - Condensed Balance Sheets (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Cash and due from banks | $ 75,721,663 | $ 70,569,993 |  |
Interest-bearing deposits at financial institutions | 55,765,012 | 63,948,925 |  |
Securities available for sale, at fair value | 272,907,907 | 251,113,139 |  |
Loans/leases receivable, held for investment | 2,963,840,399 | 2,404,351,485 |  |
Premises and equipment, net | 62,838,255 | 60,643,508 |  |
Other assets | 45,817,687 | 37,503,284 |  |
Total assets | 3,982,664,773 | 3,301,943,748 | $ 2,593,198,275 |
Other borrowings | 66,000,000 | 80,000,000 |  |
Other liabilities | 53,242,979 | 55,690,087 |  |
Total liabilities | 3,629,377,644 | 3,015,902,949 |  |
Common stock | 13,918,168 | 13,106,845 |  |
Additional paid-in capital | 189,077,550 | 156,776,642 |  |
Retained earnings | 151,962,661 | 118,616,901 |  |
Total stockholders' equity | 353,287,129 | 286,040,799 | $ 225,885,750 | $ 144,078,509
Total liabilities and stockholders' equity | 3,982,664,773 | 3,301,943,748 |  |
Parent Company [Member] |  |  |  |
Cash and due from banks | 4,325,582 | 6,929,755 |  |
Interest-bearing deposits at financial institutions | 601 | 651 |  |
Securities available for sale, at fair value | 1,690,726 | 1,545,565 |  |
Loans/leases receivable, held for investment | 1,710,000 |  |  |
Premises and equipment, net | 4,947,572 | 5,104,677 |  |
Other assets | 11,630,304 | 15,245,521 |  |
Total assets | 437,366,647 | 375,847,099 |  |
Other borrowings | 31,000,000 | 35,000,000 |  |
Junior subordinated debentures | 37,486,487 | 33,480,202 |  |
Other liabilities | 15,593,031 | 21,326,098 |  |
Total liabilities | 84,079,518 | 89,806,300 |  |
Common stock | 13,918,168 | 13,106,845 |  |
Additional paid-in capital | 189,077,550 | 156,776,642 |  |
Retained earnings | 151,962,661 | 118,616,901 |  |
Accumulated other comprehensive loss | (1,671,250) | (2,459,589) |  |
Total stockholders' equity | 353,287,129 | 286,040,799 |  |
Total liabilities and stockholders' equity | 437,366,647 | 375,847,099 |  |
Parent Company [Member] | Bank Subsidiaries [Member] |  |  |  |
Investment in bank subsidiaries | 410,105,525 | 345,866,288 |  |
Parent Company [Member] | Non-bank Subsidiaries [Member] |  |  |  |
Investment in bank subsidiaries | $ 2,956,337 | $ 1,154,642 |  |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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