Consolidated Statements Of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Interest Income
Interest and fees on loans	$ 33,961	$ 35,761	$ 101,399	$ 114,813
Interest and dividends on investment securities:
Taxable	6,144	6,266	17,318	17,855
Tax-exempt	1,257	1,132	3,801	2,659
Interest on deposits in depository institutions	196	72	476	432
Total Interest Income	41,558	43,231	122,994	135,759
Interest Expense
Interest on deposits	1,955	5,123	7,695	18,324
Interest on short-term borrowings	115	131	357	873
Interest on long-term debt	0	0	0	100
Total Interest Expense	2,070	5,254	8,052	19,297
Net Interest Income	39,488	37,977	114,942	116,462
(Recovery of) provision for credit losses	(725)	1,026	(3,165)	10,248
Net Interest Income After (Recovery of) Provision for Credit Losses	40,213	36,951	118,107	106,214
Non-Interest Income
Net securities gains reclassified into earnings	0	0	312	56
Unrealized gains (losses) recognized on equity securities still held	93	461	452	(1,698)
Bank owned  life insurance	747	1,088	3,147	3,611
Sale of VISA shares	0	0	0	17,837
Other income	1,438	1,232	3,190	3,550
Total Non-Interest Income	17,947	16,985	52,025	64,960
Non-Interest Expense
Salaries and employee benefits	15,321	15,361	46,551	46,085
Occupancy related expense	2,507	2,428	7,654	7,318
Equipment and software related expense	2,554	2,607	7,753	7,540
FDIC insurance expense	396	355	1,183	522
Advertising	804	462	2,509	2,238
Bankcard expenses	1,549	1,517	4,879	4,450
Postage, delivery, and statement mailings	573	513	1,733	1,721
Office supplies	406	396	1,169	1,143
Legal and professional fees	610	548	1,874	1,738
Telecommunications	790	547	2,156	1,589
Repossessed asset (gains) losses, net of expenses	(108)	39	(28)	313
Other expenses	3,776	3,939	11,128	11,992
Total Non-Interest Expense	29,178	28,712	88,561	86,649
Income Before Income Taxes	28,982	25,224	81,571	84,525
Income tax expense	6,250	5,098	16,877	17,151
Net Income Available to Common Shareholders	$ 22,732	$ 20,126	$ 64,694	$ 67,374
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]
Average shares outstanding, basic (in shares)	15,279	15,950	15,501	16,065
Effect of dilutive securities (in shares)	23	20	25	19
Average shares outstanding, diluted (in shares)	15,302	15,970	15,526	16,084
Earnings Per Share [Abstract]
Basic earnings per common share (in dollars per share)	$ 1.47	$ 1.25	$ 4.13	$ 4.15
Diluted earnings per common share (in dollars per share)	$ 1.47	$ 1.25	$ 4.13	$ 4.15
Service charges
Non-Interest Income
Revenue from contract with customer	$ 6,706	$ 6,295	$ 18,482	$ 18,962
Bankcard revenue
Non-Interest Income
Revenue from contract with customer	6,791	6,065	20,225	17,068
Trust and investment management fee income
Non-Interest Income
Revenue from contract with customer	$ 2,172	$ 1,844	$ 6,217	$ 5,574