Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest income
Loans	$ 22,117	$ 20,167	$ 65,106	$ 57,613
Securities held-to-maturity	14,623	11,507	43,006	32,930
Securities available-for-sale	2,184	2,500	7,305	6,821
Federal funds sold and interest-bearing deposits in other banks	928	591	3,204	2,239
Total interest income	39,852	34,765	118,621	99,603
Interest expense
Savings and NOW deposits	5,445	2,972	16,788	7,778
Money market accounts	5,050	3,652	15,805	9,039
Time deposits	3,038	2,571	8,724	7,465
Securities sold under agreements to repurchase	697	288	1,572	657
Other borrowed funds and subordinated debentures	1,852	2,078	5,274	5,793
Total interest expense	16,082	11,561	48,163	30,732
Net interest income	23,770	23,204	70,458	68,871
Provision for loan losses	75		700	900
Net interest income after provision for loan losses	23,695	23,204	69,758	67,971
Other operating income
Service charges on deposit accounts	2,310	2,137	6,801	6,268
Lockbox fees	937	892	3,018	2,304
Net gains on sales of securities	53	105	61	302
Gains on sales of mortgage loans	0		154
Other income	986	1,035	3,676	3,210
Total other operating income	4,286	4,169	13,710	12,084
Operating expenses
Salaries and employee benefits	10,670	10,570	32,621	32,331
Occupancy	1,463	1,481	4,686	4,579
Equipment	862	781	2,440	2,355
Other	4,467	4,516	14,170	13,243
Total operating expenses	17,462	17,348	53,917	52,508
Income before income taxes	10,519	10,025	29,551	27,547
Provision for income taxes	435	444	584	1,259
Net income	$ 10,084	$ 9,581	$ 28,967	$ 26,288
Class A Common Stock [Member]
Share data:
Weighted average number of shares outstanding, basic	3,650,449	3,608,329	3,627,076	3,608,129
Weighted average number of shares outstanding, diluted	5,567,909	5,567,909	5,567,909	5,567,909
Basic earnings per share	$ 2.19	$ 2.09	$ 6.30	$ 5.73
Diluted earnings per share	$ 1.81	$ 1.72	$ 5.20	$ 4.72
Class B Common Stock [Member]
Share data:
Weighted average number of shares outstanding, basic	1,917,460	1,959,580	1,940,833	1,959,780
Weighted average number of shares outstanding, diluted	1,917,460	1,959,580	1,940,833	1,959,780
Basic earnings per share	$ 1.09	$ 1.04	$ 3.15	$ 2.86
Diluted earnings per share	$ 1.09	$ 1.04	$ 3.15	$ 2.86