Consolidated Statements Of Income (Unaudited) - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Interest Income
Interest and fees on loans	$ 33,208,000	$ 33,114,000	$ 65,082,000	$ 67,438,000
Interest and dividends on investment securities:
Taxable	7,547,000	5,932,000	13,770,000	11,174,000
Tax-exempt	1,205,000	1,291,000	2,421,000	2,544,000
Interest on deposits in depository institutions	782,000	162,000	1,020,000	280,000
Total Interest Income	42,742,000	40,499,000	82,293,000	81,436,000
Interest Expense
Interest on deposits	1,328,000	2,460,000	2,849,000	5,740,000
Interest on short-term borrowings	124,000	125,000	238,000	242,000
Total Interest Expense	1,452,000	2,585,000	3,087,000	5,982,000
Net Interest Income	41,290,000	37,914,000	79,206,000	75,454,000
Recovery of credit losses	0	(2,000,000)	(756,000)	(2,440,000)
Net Interest Income After Recovery of Credit Losses	41,290,000	39,914,000	79,962,000	77,894,000
Non-Interest Income
Net securities gains reclassified into earnings	0	29,000	0	312,000
Unrealized (losses) gains recognized on equity securities still held, net	(601,000)	410,000	(1,324,000)	359,000
Bank owned  life insurance	978,000	940,000	2,992,000	2,400,000
Other income	1,243,000	941,000	2,034,000	1,752,000
Total Non-Interest Income	17,849,000	17,448,000	35,297,000	34,078,000
Non-Interest Expense
Salaries and employee benefits	16,413,000	15,559,000	31,990,000	31,230,000
Occupancy related expense	2,620,000	2,525,000	5,329,000	5,147,000
Equipment and software related expense	2,732,000	2,655,000	5,501,000	5,199,000
FDIC insurance expense	409,000	382,000	844,000	787,000
Advertising	951,000	824,000	1,749,000	1,705,000
Bankcard expenses	1,665,000	1,746,000	3,271,000	3,330,000
Postage, delivery, and statement mailings	551,000	568,000	1,187,000	1,160,000
Office supplies	427,000	371,000	837,000	763,000
Legal and professional fees	525,000	589,000	1,052,000	1,264,000
Telecommunications	754,000	676,000	1,338,000	1,366,000
Repossessed asset (gains) losses, net of expenses	(32,000)	1,000	8,000	80,000
Other expenses	3,674,000	3,678,000	7,110,000	7,352,000
Total Non-Interest Expense	30,689,000	29,574,000	60,216,000	59,383,000
Income Before Income Taxes	28,450,000	27,788,000	55,043,000	52,589,000
Income tax expense	5,767,000	5,640,000	11,018,000	10,627,000
Net Income Available to Common Shareholders	$ 22,683,000	$ 22,148,000	$ 44,025,000	$ 41,962,000
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Average shares outstanding, basic (in shares)	14,888	15,573	14,930	15,614
Effect of dilutive securities (in shares)	21	21	24	26
Average shares outstanding, diluted (in shares)	14,909	15,594	14,954	15,640
Earnings Per Share [Abstract]
Basic earnings per common share (in dollars per share)	$ 1.51	$ 1.41	$ 2.92	$ 2.66
Diluted earnings per common share (in dollars per share)	$ 1.51	$ 1.41	$ 2.92	$ 2.66
Service charges
Non-Interest Income
Revenue from contract with customer	$ 7,067,000	$ 5,895,000	$ 13,792,000	$ 11,776,000
Bankcard revenue
Non-Interest Income
Revenue from contract with customer	7,062,000	7,221,000	13,506,000	13,434,000
Trust and investment management fee income
Non-Interest Income
Revenue from contract with customer	$ 2,100,000	$ 2,012,000	$ 4,297,000	$ 4,045,000