Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Interest income
Loans	$ 21,309	$ 18,267
Securities held-to-maturity	13,788	10,288
Securities available-for-sale	2,631	1,992
Federal funds sold and interest-bearing deposits in other banks	1,349	883
Total interest income	39,077	31,430
Interest expense
Savings and NOW deposits	5,466	2,223
Money market accounts	5,343	2,453
Time deposits	2,793	2,363
Securities sold under agreements to repurchase	385	181
Other borrowed funds and subordinated debentures	1,652	1,742
Total interest expense	15,639	8,962
Net interest income	23,438	22,468
Provision for loan losses	375	450
Net interest income after provision for loan losses	23,063	22,018
Other operating income
Service charges on deposit accounts	2,209	2,067
Lockbox fees	1,089	791
Net gains on sales of securities		197
Gains on sales of mortgage loans	15
Other income	1,114	1,138
Total other operating income	4,427	4,193
Operating expenses
Salaries and employee benefits	11,035	11,225
Occupancy	1,701	1,637
Equipment	783	794
FDIC assessments	373	383
Other	4,298	3,962
Total operating expenses	18,190	18,001
Income before income taxes	9,300	8,210
(Benefit) provision for income taxes	(118)	501
Net income	$ 9,418	$ 7,709
Class A Common Stock [Member]
Share data:
Weighted average number of shares outstanding, basic	3,610,329	3,608,029
Weighted average number of shares outstanding, diluted	5,567,909	5,567,909
Basic earnings per share	$ 2.05	$ 1.68
Diluted earnings per share	$ 1.69	$ 1.38
Class B Common Stock [Member]
Share data:
Weighted average number of shares outstanding, basic	1,957,580	1,959,880
Weighted average number of shares outstanding, diluted	1,957,580	1,959,880
Basic earnings per share	$ 1.03	$ 0.84
Diluted earnings per share	$ 1.03	$ 0.84