Consolidated Statements Of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest and dividend income:
Loans	$ 117,171	$ 112,784	$ 97,027
Taxable	15,212	12,040	7,754
Nontaxable	11,467	13,413	13,484
Total interest and dividend income	143,850	138,237	118,265
Interest expense:
Savings, NOW and money market deposits	18,563	12,105	7,113
Time deposits	14,494	10,452	5,479
Short-term borrowings	3,261	4,858	1,345
Long-term debt	7,363	8,315	7,772
Total interest expense	43,681	35,730	21,709
Net interest income	100,169	102,507	96,556
Provision (credit) for loan losses	33	(1,755)	4,854
Net interest income after provision (credit) for loan losses	100,136	104,262	91,702
Noninterest income:
Investment Management Division income	2,010	2,175	2,090
Service charges on deposit accounts	3,214	2,634	2,792
Net gains (losses) on sales of securities	14	(10,406)	(1,866)
Other	5,373	7,876	5,145
Total	10,611	2,279	8,161
Noninterest expense:
Salaries and employee benefits	37,111	36,465	32,641
Occupancy and equipment	11,904	11,686	10,245
Other	11,949	11,755	11,966
Total noninterest expense	60,964	59,906	54,852
Income before income taxes	49,783	46,635	45,011
Income tax expense	8,228	5,062	9,889
Net income	$ 41,555	$ 41,573	$ 35,122
Earnings per share:
Basic	$ 1.68	$ 1.64	$ 1.44
Diluted	1.67	1.63	1.43
Cash dividends declared per share	$ 0.70	$ 0.64	$ 0.58