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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (USD $) | Series F Noncumulative Perpetual Preferred Stock Redemption Two[Member] Preferred Stock [Member] | Series F Noncumulative Perpetual Preferred Stock Redemption Two[Member] Additional Paid-in Capital [Member] | Series F Noncumulative Perpetual Preferred Stock Redemption Two[Member] | Preferred Stock [Member] | Common Stock [Member] Restricted Stock [Member] Exchange [Member] | Common Stock [Member] Exchange [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] Restricted Stock [Member] Exchange [Member] | Additional Paid-in Capital [Member] Exchange [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Treasury Stock [Member] | Restricted Stock [Member] Exchange [Member] | Exchange [Member] | Total
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Balance at Dec. 31, 2012 |  |  |  | $ 54,867 |  |  | $ 5,039,448 |  |  | $ 78,912,791 | $ 53,326,542 | $ 4,706,683 | $ (1,606,510) |  |  | $ 140,433,821
Net income |  |  |  |  |  |  |  |  |  |  | 3,265,144 |  |  |  |  | 3,265,144
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |  | (836,358) |  |  |  | (836,358)
Preferred cash dividends declared |  |  |  |  |  |  |  |  |  |  | (810,837) |  |  |  |  | (810,837)
Proceeds from issuance of shares of common stock as a result of stock purchased under the Employee Stock Purchase Plan |  |  |  |  |  |  | 5,884 |  |  | 63,487 |  |  |  |  |  | 69,371
Proceeds from issuance of shares of common stock as a result of stock options exercised |  |  |  |  |  |  | 19,278 |  |  | 153,550 |  |  |  |  |  | 172,828
Stock compensation expense |  |  |  |  |  |  |  |  |  | 293,798 |  |  |  |  |  | 293,798
Tax benefit of nonqualified stock options exercised |  |  |  |  |  |  |  |  |  | 35,251 |  |  |  |  |  | 35,251
Restricted stock awards |  |  |  |  |  |  | 16,798 |  |  | (16,798) |  |  |  |  |  |
Exchange of shares of common stock in connection with restricted stock vested, net |  |  |  |  |  | (7,048) | (16,798) |  | (111,628) | (289,113) |  |  |  |  | (118,676) | (305,911)
Balance at Mar. 31, 2013 |  |  |  | 54,867 |  |  | 5,057,562 |  |  | 79,041,338 | 55,780,849 | 3,870,325 | (1,606,510) |  |  | 142,198,431
Net income |  |  |  |  |  |  |  |  |  |  | 4,045,231 |  |  |  |  | 4,045,231
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |  | (13,091,489) |  |  |  | (13,091,489)
Common cash dividends declared |  |  |  |  |  |  |  |  |  |  | (228,971) |  |  |  |  | (228,971)
Preferred cash dividends declared |  |  |  |  |  |  |  |  |  |  | (810,838) |  |  |  |  | (810,838)
Proceeds from issuance of 834,715 shares of common stock as a result of the acquisition of Community National Bancorporation, net |  |  |  |  |  |  | 834,715 |  |  | 12,181,894 |  |  |  |  |  | 13,016,609
Proceeds from issuance of shares of common stock as a result of stock purchased under the Employee Stock Purchase Plan |  |  |  |  |  |  | 9,560 |  |  | 104,221 |  |  |  |  |  | 113,781
Proceeds from issuance of shares of common stock as a result of stock options exercised |  |  |  |  |  |  | 3,769 |  |  | 33,070 |  |  |  |  |  | 36,839
Stock compensation expense |  |  |  |  |  |  |  |  |  | 162,123 |  |  |  |  |  | 162,123
Tax benefit of nonqualified stock options exercised |  |  |  |  |  |  |  |  |  | 4,197 |  |  |  |  |  | 4,197
Restricted stock awards |  |  |  |  |  |  | 12,707 |  |  | (12,707) |  |  |  |  |  |
Balance at Jun. 30, 2013 |  |  |  | 54,867 |  |  | 5,918,313 |  |  | 91,514,136 | 58,786,271 | (9,221,164) | (1,606,510) |  |  | 145,445,913
Net income |  |  |  |  |  |  |  |  |  |  | 3,811,944 |  |  |  |  | 3,811,944
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |  | (818,191) |  |  |  | (818,191)
Preferred cash dividends declared |  |  |  |  |  |  |  |  |  |  | (810,837) |  |  |  |  | (810,837)
Proceeds from issuance of shares of common stock as a result of stock purchased under the Employee Stock Purchase Plan |  |  |  |  |  |  | 5,973 |  |  | 65,116 |  |  |  |  |  | 71,089
Proceeds from issuance of shares of common stock as a result of stock options exercised |  |  |  |  |  |  | 7,230 |  |  | 76,718 |  |  |  |  |  | 83,948
Stock compensation expense |  |  |  |  |  |  |  |  |  | 163,585 |  |  |  |  |  | 163,585
Tax benefit of nonqualified stock options exercised |  |  |  |  |  |  |  |  |  | 6,026 |  |  |  |  |  | 6,026
Restricted stock awards |  |  |  |  |  |  | 332 |  |  | (332) |  |  |  |  |  |
Balance at Sep. 30, 2013 |  |  |  | 54,867 |  |  | 5,931,848 |  |  | 91,825,249 | 61,787,378 | (10,039,355) | (1,606,510) |  |  | 147,953,477
Balance at Dec. 31, 2013 |  |  |  | 29,867 |  |  | 8,005,708 |  |  | 90,154,528 | 64,637,173 | (13,643,986) | (1,606,510) |  |  | 147,576,780
Net income |  |  |  |  |  |  |  |  |  |  | 3,889,215 |  |  |  |  | 3,889,215
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |  | 5,230,784 |  |  |  | 5,230,784
Preferred cash dividends declared |  |  |  |  |  |  |  |  |  |  | (708,008) |  |  |  |  | (708,008)
Redemption of shares of Series F Noncumulative Perpetual Preferred Stock | (15,000) | (14,985,000) | (15,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of shares of common stock as a result of stock purchased under the Employee Stock Purchase Plan |  |  |  |  |  |  | 6,189 |  |  | 78,256 |  |  |  |  |  | 84,445
Proceeds from issuance of shares of common stock as a result of stock options exercised |  |  |  |  |  |  | 9,814 |  |  | 85,582 |  |  |  |  |  | 95,396
Stock compensation expense |  |  |  |  |  |  |  |  |  | 347,752 |  |  |  |  |  | 347,752
Tax benefit of nonqualified stock options exercised |  |  |  |  |  |  |  |  |  | 18,647 |  |  |  |  |  | 18,647
Restricted stock awards |  |  |  |  |  |  | 27,197 |  |  | (27,197) |  |  |  |  |  |
Exchange of shares of common stock in connection with restricted stock vested, net |  |  |  |  | (10,300) |  |  | (167,684) |  |  |  |  |  | (177,984) |  |
Balance at Mar. 31, 2014 |  |  |  | 14,867 |  |  | 8,038,608 |  |  | 75,504,884 | 67,818,380 | (8,413,202) | (1,606,510) |  |  | 141,357,027
Net income |  |  |  |  |  |  |  |  |  |  | 4,007,836 |  |  |  |  | 4,007,836
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |  | 4,476,014 |  |  |  | 4,476,014
Common cash dividends declared |  |  |  |  |  |  |  |  |  |  | (315,053) |  |  |  |  | (315,053)
Preferred cash dividends declared |  |  |  |  |  |  |  |  |  |  | (373,869) |  |  |  |  | (373,869)
Redemption of shares of Series F Noncumulative Perpetual Preferred Stock | (14,867) | (14,809,055) | (14,823,922) |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of shares of common stock as a result of stock purchased under the Employee Stock Purchase Plan |  |  |  |  |  |  | 8,361 |  |  | 119,797 |  |  |  |  |  | 128,158
Proceeds from issuance of shares of common stock as a result of stock options exercised |  |  |  |  |  |  | 630 |  |  | 5,159 |  |  |  |  |  | 5,789
Stock compensation expense |  |  |  |  |  |  |  |  |  | 179,265 |  |  |  |  |  | 179,265
Tax benefit of nonqualified stock options exercised |  |  |  |  |  |  |  |  |  | 1,284 |  |  |  |  |  | 1,284
Restricted stock awards |  |  |  |  |  |  | 2,290 |  |  | (2,290) |  |  |  |  |  |
Balance at Jun. 30, 2014 |  |  |  |  |  |  | 8,049,889 |  |  | 60,999,044 | 71,137,294 | (3,937,188) | (1,606,510) |  |  | 134,642,529
Net income |  |  |  |  |  |  |  |  |  |  | 4,062,665 |  |  |  |  | 4,062,665
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |  | (812,175) |  |  |  | (812,175)
Proceeds from issuance of shares of common stock as a result of stock purchased under the Employee Stock Purchase Plan |  |  |  |  |  |  | 5,481 |  |  | 78,533 |  |  |  |  |  | 84,014
Proceeds from issuance of shares of common stock as a result of stock options exercised |  |  |  |  |  |  | 2,400 |  |  | 19,097 |  |  |  |  |  | 21,497
Stock compensation expense |  |  |  |  |  |  |  |  |  | 176,257 |  |  |  |  |  | 176,257
Tax benefit of nonqualified stock options exercised |  |  |  |  |  |  |  |  |  | 5,189 |  |  |  |  |  | 5,189
Restricted stock awards |  |  |  |  |  |  | 289 |  |  | (289) |  |  |  |  |  |
Balance at Sep. 30, 2014 |  |  |  |  |  |  | $ 8,058,059 |  |  | $ 61,277,831 | $ 75,199,959 | $ (4,749,363) | $ (1,606,510) |  |  | $ 138,179,976

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