Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Interest income
Loans	$ 21,680	$ 19,179	$ 42,989	$ 37,446
Securities held-to-maturity	14,595	11,135	28,383	21,423
Securities available-for-sale	2,490	2,329	5,121	4,321
Federal funds sold and interest-bearing deposits in other banks	927	765	2,276	1,648
Total interest income	39,692	33,408	78,769	64,838
Interest expense
Savings and NOW deposits	5,877	2,583	11,342	4,806
Money market accounts	5,412	2,934	10,756	5,387
Time deposits	2,893	2,531	5,686	4,894
Securities sold under agreements to repurchase	490	188	875	369
Other borrowed funds and subordinated debentures	1,770	1,973	3,422	3,715
Total interest expense	16,442	10,209	32,081	19,171
Net interest income	23,250	23,199	46,688	45,667
Provision for loan losses	250	450	625	900
Net interest income after provision for loan losses	23,000	22,749	46,063	44,767
Other operating income
Service charges on deposit accounts	2,282	2,064	4,491	4,131
Lockbox fees	992	621	2,081	1,412
Net gains on sales of securities	7		7	197
Gains on sales of mortgage loans	139		154
Other income	1,577	1,037	2,691	2,175
Total other operating income	4,997	3,722	9,424	7,915
Operating expenses
Salaries and employee benefits	10,916	10,536	21,951	21,761
Occupancy	1,522	1,461	3,223	3,098
Equipment	795	780	1,578	1,574
FDIC assessments	349	359	722	742
Other	4,682	4,023	8,980	7,985
Total operating expenses	18,264	17,159	36,454	35,160
Income before income taxes	9,733	9,312	19,033	17,522
Provision for income taxes	267	314	149	815
Net income	$ 9,466	$ 8,998	$ 18,884	$ 16,707
Class A Common Stock [Member]
Share data:
Weighted average number of shares outstanding, basic	3,620,449	3,608,029	3,615,389	3,608,029
Weighted average number of shares outstanding, diluted	5,567,909	5,567,909	5,567,909	5,567,909
Basic earnings per share	$ 2.06	$ 1.96	$ 4.11	$ 3.64
Diluted earnings per share	$ 1.70	$ 1.62	$ 3.39	$ 3.00
Class B Common Stock [Member]
Share data:
Weighted average number of shares outstanding, basic	1,947,460	1,959,880	1,952,520	1,959,880
Weighted average number of shares outstanding, diluted	1,947,460	1,959,880	1,952,520	1,959,880
Basic earnings per share	$ 1.03	$ 0.98	$ 2.06	$ 1.82
Diluted earnings per share	$ 1.03	$ 0.98	$ 2.06	$ 1.82