CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (loss) [Member]	Total
Balance at Dec. 31, 2018	$ 112,507	$ 3,066	$ 164,117	$ (6,666)	$ 273,024
Balance (in shares) at Dec. 31, 2018	15,300,460
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			17,724		17,724
Other comprehensive income, net of tax				10,892	10,892
Exercise of stock options	$ 554	(96)			458
Exercise of stock options (in shares)	32,090
Stock compensation costs		267			267
Cash dividends			(5,513)		(5,513)
Balance at Jun. 30, 2019	$ 113,061	3,237	176,328	4,226	296,852
Balance (in shares) at Jun. 30, 2019	15,332,550
Balance at Mar. 31, 2019	$ 113,001	3,135	170,258	(2,326)	284,068
Balance (in shares) at Mar. 31, 2019	15,328,030
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			8,829		8,829
Other comprehensive income, net of tax				6,552	6,552
Exercise of stock options	$ 60	(14)			46
Exercise of stock options (in shares)	4,520
Stock compensation costs		116			116
Cash dividends			(2,759)		(2,759)
Balance at Jun. 30, 2019	$ 113,061	3,237	176,328	4,226	296,852
Balance (in shares) at Jun. 30, 2019	15,332,550
Balance at Dec. 31, 2019	$ 113,179	3,307	186,867	5,932	309,285
Balance (in shares) at Dec. 31, 2019	15,284,538
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			16,110		16,110
Other comprehensive income, net of tax				10,247	10,247
Exercise of stock options	$ 295	(80)			215
Exercise of stock options (in shares)	20,350
Stock compensation costs		235			235
Stock repurchase	$ (829)		(1,733)		(2,562)
Stock repurchase (in shares)	(112,050)
Cash dividends			(6,097)		(6,097)
Balance at Jun. 30, 2020	$ 112,645	3,462	195,147	16,179	327,433
Balance (in shares) at Jun. 30, 2020	15,192,838
Balance at Mar. 31, 2020	$ 112,600	3,367	189,882	13,610	319,459
Balance (in shares) at Mar. 31, 2020	15,190,038
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income			8,303		8,303
Other comprehensive income, net of tax				2,569	2,569
Exercise of stock options	$ 45	(11)			34
Exercise of stock options (in shares)	2,800
Stock compensation costs		106			106
Cash dividends			(3,038)		(3,038)
Balance at Jun. 30, 2020	$ 112,645	$ 3,462	$ 195,147	$ 16,179	$ 327,433
Balance (in shares) at Jun. 30, 2020	15,192,838