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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($)
$ in Thousands
Employee Stock Ownership Plan [Member]
Common Stock [Member]
Employee Stock Ownership Plan [Member]
Additional Paid-in Capital [Member]
Employee Stock Ownership Plan [Member]
Retained Earnings [Member]
Employee Stock Ownership Plan [Member]
AOCI Attributable to Parent [Member]
Employee Stock Ownership Plan [Member]
First National Corporation 2014 Stock Incentive Plan [Member]
Common Stock [Member]
First National Corporation 2014 Stock Incentive Plan [Member]
Additional Paid-in Capital [Member]
First National Corporation 2014 Stock Incentive Plan [Member]
Retained Earnings [Member]
First National Corporation 2014 Stock Incentive Plan [Member]
AOCI Attributable to Parent [Member]
First National Corporation 2014 Stock Incentive Plan [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Total
Balance at Dec. 31, 2017                     $ 6,182 $ 7,260 $ 45,670 $ (958) $ 58,154
Net income                     7,814 7,814
Other comprehensive income (loss)                     (1,766) (1,766)
Cash dividends on common stock                     (743) (743)
Stock-based compensation                     170 170
Issuance of common stock, dividend reinvestment plan                     3 43 46
Issuance of common stock, stock incentive plan                     12 (12)
Repurchase of common stock           $ (1) $ (23) $ (24)          
Balance at Sep. 30, 2018                     6,196 7,438 52,741 (2,724) 63,651
Balance at Jun. 30, 2018                     6,192 7,346 50,313 (2,203) 61,648
Net income                     2,676 2,676
Other comprehensive income (loss)                     (521) (521)
Cash dividends on common stock                     (248) (248)
Stock-based compensation                     81 81
Issuance of common stock, dividend reinvestment plan                     1 14 15
Issuance of common stock, stock incentive plan                     3 (3)
Balance at Sep. 30, 2018                     6,196 7,438 52,741 (2,724) 63,651
Balance at Dec. 31, 2018                     6,197 7,471 54,814 (1,808) 66,674 [1]
Net income                     6,840 6,840
Other comprehensive income (loss)                     2,952 2,952
Cash dividends on common stock                     (1,340) (1,340)
Stock-based compensation                     159 159
Issuance of common stock, dividend reinvestment plan                     5 78 83
Issuance of common stock, stock incentive plan                     12 (12)
Repurchase of common stock $ (2) $ (30) $ (32) $ (2) $ (18) $ (20)          
Balance at Sep. 30, 2019                     6,210 7,648 60,314 1,144 75,316
Balance at Jun. 30, 2019                     6,206 7,566 58,268 769 72,809
Net income                     2,493 2,493
Other comprehensive income (loss)                     375 375
Cash dividends on common stock                     (447) (447)
Stock-based compensation                     91 91
Issuance of common stock, dividend reinvestment plan                     1 26 27
Issuance of common stock, stock incentive plan                     5 (5)
Repurchase of common stock $ (2) $ (30) $ (32)                    
Balance at Sep. 30, 2019                     $ 6,210 $ 7,648 $ 60,314 $ 1,144 $ 75,316
[1] Derived from audited consolidated financial statements.