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Condensed Financial Statements of Parent Company (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:                      
Net income $ 1,828 $ 2,014 $ 1,833 $ 1,658 $ 1,367 $ 1,720 $ 1,635 $ 1,446 $ 7,333 $ 6,168 $ 6,090
Adjustments to reconcile net income to net cash from operating activities:                      
Amortization                 893 1,061 1,531
Net gain on sale of securities                 (34) 280 (312)
Change in market value of equity securities                 (71)    
Changes in other assets                 (875) 417 (1,952)
Changes in other liabilities                 573 (783) 1,804
Net cash from operating activities                 9,955 8,090 10,927
Cash flows from investing activities:                      
Sales of securities                 2,725 57,628 15,317
Purchases of securities                 (31,450) (56,123) (69,526)
Net cash used in investing activities                 (43,855) (18,302) (41,477)
Cash flows from financing activities:                      
Issuance of common stock                 77 98 85
Repurchase of common stock                 (523) (203) (794)
Cash dividends paid                 (2,580) (2,324) (2,231)
Net cash from financing activities                 16,753 32,240 34,172
Net change in cash                 (17,147) 22,028 3,622
Parent Company [Member]                      
Cash flows from operating activities:                      
Net income                 7,333 6,168 6,090
Adjustments to reconcile net income to net cash from operating activities:                      
Equity in undistributed net income of subsidiary                 (4,451) (3,120) (2,971)
Amortization                 18 19 20
Compensation expense on employee and director stock purchases, stock options, and restricted stock units                 331 304 367
Net gain on sale of securities                 (9) (1)  
Change in market value of equity securities                 (184)    
Changes in other assets                 66 (37) (68)
Changes in other liabilities                 (19) (39) (1)
Net cash from operating activities                 3,085 3,294 3,437
Cash flows from investing activities:                      
Sales of securities                 91 334  
Purchases of securities                 (466) (1,126)
Net cash used in investing activities                 91 (132) (1,126)
Cash flows from financing activities:                      
Issuance of common stock                 77 98 85
Repurchase of common stock                 (523) (203) (794)
Cash dividends paid                 (2,579) (2,324) (2,231)
Net cash from financing activities                 (3,025) (2,429) (2,940)
Net change in cash                 151 733 (629)
Beginning cash       $ 1,249       $ 516 1,249 516 1,145
Ending cash $ 1,400       $ 1,249       $ 1,400 $ 1,249 $ 516