Consolidated Statements Of Income (Unaudited) - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Interest Income
Interest and fees on loans	$ 38,493,000	$ 33,961,000	$ 103,575,000	$ 101,399,000
Interest and dividends on investment securities:
Taxable	9,556,000	6,144,000	23,327,000	17,318,000
Tax-exempt	1,228,000	1,257,000	3,650,000	3,801,000
Interest on deposits in depository institutions	1,530,000	196,000	2,549,000	476,000
Total Interest Income	50,807,000	41,558,000	133,101,000	122,994,000
Interest Expense
Interest on deposits	1,585,000	1,955,000	4,433,000	7,695,000
Interest on short-term borrowings	440,000	115,000	677,000	357,000
Total Interest Expense	2,025,000	2,070,000	5,110,000	8,052,000
Net Interest Income	48,782,000	39,488,000	127,991,000	114,942,000
Provision for (recovery of) credit losses	730,000	(725,000)	(26,000)	(3,165,000)
Net Interest Income After Provision for (Recovery of) Credit Losses	48,052,000	40,213,000	128,017,000	118,107,000
Non-Interest Income
Net securities gains reclassified into earnings	0	0	0	312,000
Unrealized gains (losses) recognized on equity securities still held, net	1,000	93,000	(1,322,000)	452,000
Bank owned  life insurance	754,000	747,000	3,746,000	3,147,000
Other income	792,000	1,438,000	2,825,000	3,190,000
Total Non-Interest Income	18,244,000	17,947,000	53,543,000	52,025,000
Non-Interest Expense
Salaries and employee benefits	17,398,000	15,321,000	49,386,000	46,551,000
Occupancy related expense	2,664,000	2,507,000	7,993,000	7,654,000
Equipment and software related expense	2,949,000	2,554,000	8,452,000	7,753,000
FDIC insurance expense	416,000	396,000	1,259,000	1,183,000
Advertising	854,000	804,000	2,603,000	2,509,000
Bankcard expenses	1,405,000	1,549,000	4,676,000	4,879,000
Postage, delivery, and statement mailings	578,000	573,000	1,765,000	1,733,000
Office supplies	466,000	406,000	1,303,000	1,169,000
Legal and professional fees	532,000	610,000	1,584,000	1,874,000
Telecommunications	651,000	790,000	1,988,000	2,156,000
Repossessed asset (gains) losses, net of expenses	(3,000)	(108,000)	4,000	(28,000)
Other expenses	3,591,000	3,776,000	10,701,000	11,128,000
Total Non-Interest Expense	31,501,000	29,178,000	91,714,000	88,561,000
Income Before Income Taxes	34,795,000	28,982,000	89,846,000	81,571,000
Income tax expense	7,421,000	6,250,000	18,438,000	16,877,000
Net Income Available to Common Shareholders	$ 27,374,000	$ 22,732,000	$ 71,408,000	$ 64,694,000
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Average shares outstanding, basic (in shares)	14,776	15,279	14,878	15,501
Effect of dilutive securities (in shares)	24	23	23	25
Average shares outstanding, diluted (in shares)	14,800	15,302	14,901	15,526
Earnings Per Share [Abstract]
Basic earnings per common share (in dollars per share)	$ 1.84	$ 1.47	$ 4.75	$ 4.13
Diluted earnings per common share (in dollars per share)	$ 1.83	$ 1.47	$ 4.75	$ 4.13
Service charges
Non-Interest Income
Revenue from contract with customer	$ 7,487,000	$ 6,706,000	$ 21,281,000	$ 18,482,000
Bankcard revenue
Non-Interest Income
Revenue from contract with customer	7,052,000	6,791,000	20,558,000	20,225,000
Trust and investment management fee income
Non-Interest Income
Revenue from contract with customer	$ 2,158,000	$ 2,172,000	$ 6,455,000	$ 6,217,000