CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of period at Dec. 31, 2018		6,627,358
Balance in the beginning of period at Dec. 31, 2018	$ 193,703	$ 41,094	$ 1,042	$ 159,073	$ (7,506)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,696			5,696
Stock incentive plan	49		49
Issuance of shares of common stock through exercise of stock options (in shares)		7,200
Issuance of shares of common stock through exercise of stock options	80	$ 80
Issuance of shares of common stock as board compensation (in shares)		2,368
Issuance of shares of common stock as board compensation	97	$ 97
Cash dividend	(1,326)			(1,326)
Other comprehensive income (loss)	3,885				3,885
Balance at the end of period at Mar. 31, 2019		6,636,926
Balance at the end of period at Mar. 31, 2019	202,184	$ 41,271	1,091	163,443	(3,621)
Balance at the beginning of period at Dec. 31, 2018		6,627,358
Balance in the beginning of period at Dec. 31, 2018	193,703	$ 41,094	1,042	159,073	(7,506)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	11,234
Other comprehensive income (loss)	7,213
Balance at the end of period at Jun. 30, 2019		7,300,246
Balance at the end of period at Jun. 30, 2019	237,911	$ 68,082	1,141	168,981	(293)
Balance at the beginning of period at Mar. 31, 2019		6,636,926
Balance in the beginning of period at Mar. 31, 2019	202,184	$ 41,271	1,091	163,443	(3,621)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	5,538			5,538
Stock incentive plan	50		50
Issuance of shares of common stock through IPO (in shares)		663,320
Issuance of shares of common stock through IPO	26,812	$ 26,812
Board compensation adjustment	(1)	$ (1)
Other comprehensive income (loss)	3,328				3,328
Balance at the end of period at Jun. 30, 2019		7,300,246
Balance at the end of period at Jun. 30, 2019	$ 237,911	$ 68,082	1,141	168,981	(293)
Balance at the beginning of period at Dec. 31, 2019	7,306,221	7,306,221
Balance in the beginning of period at Dec. 31, 2019	$ 251,898	$ 68,082	1,269	182,571	(24)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,745			6,745
Stock incentive plan	64		64
Issuance of shares of common stock through exercise of stock options (in shares)		14,720
Issuance of shares of common stock through exercise of stock options	8	$ 8
Issuance of shares of common stock as board compensation (in shares)		1,591
Issuance of shares of common stock as board compensation	87	$ 87
Cash dividend	(439)			(439)
Other comprehensive income (loss)	5,812				5,812
Balance at the end of period at Mar. 31, 2020		7,322,532
Balance at the end of period at Mar. 31, 2020	$ 264,175	$ 68,177	1,333	188,877	5,788
Balance at the beginning of period at Dec. 31, 2019	7,306,221	7,306,221
Balance in the beginning of period at Dec. 31, 2019	$ 251,898	$ 68,082	1,269	182,571	(24)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	13,599
Other comprehensive income (loss)	$ 6,244
Balance at the end of period at Jun. 30, 2020	7,322,532	7,322,532
Balance at the end of period at Jun. 30, 2020	$ 271,117	$ 68,177	1,429	195,291	6,220
Balance at the beginning of period at Mar. 31, 2020		7,322,532
Balance in the beginning of period at Mar. 31, 2020	264,175	$ 68,177	1,333	188,877	5,788
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,854			6,854
Stock incentive plan	96		96
Cash dividend	(440)			(440)
Other comprehensive income (loss)	$ 432				432
Balance at the end of period at Jun. 30, 2020	7,322,532	7,322,532
Balance at the end of period at Jun. 30, 2020	$ 271,117	$ 68,177	$ 1,429	$ 195,291	$ 6,220