Consolidated Statements of Income (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest income
Loans, including fees	$ 33,656,000	$ 33,664,000	$ 100,430,000	$ 101,428,000
Securities, taxable	1,341,000	1,212,000	3,580,000	6,840,000
Securities, tax-exempt	600,000	576,000	1,795,000	1,714,000
Other interest-earning assets	291,000	142,000	642,000	711,000
Total interest income	35,888,000	35,594,000	106,447,000	110,693,000
Interest expense
Deposits	2,184,000	3,466,000	7,247,000	11,808,000
Short-term borrowings	46,000	38,000	122,000	132,000
Federal Home Loan Bank advances	2,072,000	2,072,000	6,149,000	6,499,000
Subordinated debentures and other borrowings	462,000	509,000	1,401,000	1,857,000
Total interest expense	4,764,000	6,085,000	14,919,000	20,296,000
Net interest income	31,124,000	29,509,000	91,528,000	90,397,000
Provision for loan losses	1,900,000	3,200,000	(900,000)	11,550,000
Net interest income after provision for loan losses	29,224,000	26,309,000	92,428,000	78,847,000
Noninterest income:
Mortgage banking income	6,554,000	9,479,000	23,049,000	19,746,000
Interest rate swap fees	3,938,000	0	6,086,000	0
Payroll services income	412,000	399,000	1,374,000	1,346,000
Earnings on bank owned life insurance	298,000	290,000	872,000	933,000
Gain on sale of branch	0	0	1,058,000	0
Other income	1,095,000	368,000	1,916,000	1,042,000
Total noninterest income	15,568,000	13,307,000	43,587,000	30,839,000
Noninterest expense
Salaries and benefits	15,975,000	16,734,000	47,255,000	44,388,000
Occupancy	2,030,000	2,023,000	6,021,000	5,944,000
Furniture and equipment depreciation, rent and maintenance	929,000	871,000	2,719,000	2,500,000
Data processing costs	2,746,000	2,676,000	8,138,000	7,793,000
Other expense	4,530,000	4,119,000	13,386,000	11,954,000
Total noninterest expense	26,210,000	26,423,000	77,519,000	72,579,000
Income before federal income tax expense	18,582,000	13,193,000	58,496,000	37,107,000
Federal income tax expense	3,531,000	2,507,000	11,114,000	7,051,000
Net income	$ 15,051,000	$ 10,686,000	$ 47,382,000	$ 30,056,000
Basic earnings per share (in dollars per share)	$ 0.95	$ 0.66	$ 2.95	$ 1.85
Diluted earnings per share (in dollars per share)	0.95	0.66	2.95	1.85
Cash dividends per share (in dollars per share)	$ 0.30	$ 0.28	$ 0.88	$ 0.84
Average basic shares outstanding (in shares)	15,859,955	16,233,196	16,084,806	16,265,208
Average diluted shares outstanding (in shares)	15,860,314	16,233,666	16,085,274	16,265,986
Service Charges on Deposit and Sweep Accounts [Member]
Noninterest income:
Noninterest revenue	$ 1,324,000	$ 1,135,000	$ 3,687,000	$ 3,401,000
Credit and Debit Card [Member]
Noninterest income:
Noninterest revenue	$ 1,947,000	$ 1,636,000	$ 5,545,000	$ 4,371,000