Consolidated Statements of Income (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Interest income
Loans, including fees	$ 33,789,000	$ 34,322,000	$ 66,774,000	$ 67,764,000
Securities, taxable	1,204,000	2,187,000	2,239,000	5,628,000
Securities, tax-exempt	598,000	562,000	1,195,000	1,138,000
Other interest-earning assets	183,000	93,000	351,000	568,000
Total interest income	35,774,000	37,164,000	70,559,000	75,098,000
Interest expense
Deposits	2,346,000	3,700,000	5,063,000	8,342,000
Short-term borrowings	40,000	55,000	76,000	94,000
Federal Home Loan Bank advances	2,050,000	2,214,000	4,077,000	4,427,000
Subordinated debentures and other borrowings	467,000	624,000	939,000	1,348,000
Total interest expense	4,903,000	6,593,000	10,155,000	14,211,000
Net interest income	30,871,000	30,571,000	60,404,000	60,887,000
Provision for loan losses	(3,100,000)	7,600,000	(2,800,000)	8,350,000
Net interest income after provision for loan losses	33,971,000	22,971,000	63,204,000	52,537,000
Noninterest income:
Mortgage banking income	7,695,000	7,640,000	16,495,000	10,267,000
Interest rate swap fees	1,495,000	0	2,148,000	0
Payroll services income	405,000	370,000	962,000	947,000
Earnings on bank owned life insurance	297,000	307,000	574,000	643,000
Gain on sale of branch	1,058,000	0	1,058,000	0
Other income	477,000	248,000	821,000	675,000
Total noninterest income	14,556,000	10,984,000	28,019,000	17,534,000
Noninterest expense
Salaries and benefits	16,194,000	14,126,000	31,279,000	27,654,000
Occupancy	1,977,000	1,862,000	3,991,000	3,921,000
Furniture and equipment depreciation, rent and maintenance	902,000	851,000	1,791,000	1,629,000
Data processing costs	2,775,000	2,633,000	5,392,000	5,117,000
Other expense	4,344,000	3,744,000	8,856,000	7,835,000
Total noninterest expenses	26,192,000	23,216,000	51,309,000	46,156,000
Income before federal income tax expense	22,335,000	10,739,000	39,914,000	23,915,000
Federal income tax expense	4,244,000	2,041,000	7,583,000	4,545,000
Net income	$ 18,091,000	$ 8,698,000	$ 32,331,000	$ 19,370,000
Basic earnings per share (in dollars per share)	$ 1.12	$ 0.54	$ 2.00	$ 1.19
Diluted earnings per share (in dollars per share)	1.12	0.54	2.00	1.19
Cash dividends per share (in dollars per share)	$ 0.29	$ 0.28	$ 0.58	$ 0.56
Average basic shares outstanding (in shares)	16,116,070	16,212,500	16,199,096	16,281,391
Average diluted shares outstanding (in shares)	16,116,666	16,213,264	16,199,620	16,282,341
Service Charges on Deposit and Sweep Accounts [Member]
Noninterest income:
Noninterest revenue	$ 1,209,000	$ 1,045,000	$ 2,363,000	$ 2,267,000
Credit and Debit Card [Member]
Noninterest income:
Noninterest revenue	$ 1,920,000	$ 1,374,000	$ 3,598,000	$ 2,735,000