Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Interest and Loan Fee Income:
Loans	$ 15,278	$ 14,822	$ 29,087	$ 29,619
Equity securities	103	99	206	197
Debt securities available for sale	22,429	17,823	43,744	35,344
Debt securities held to maturity	3,616	4,924	7,524	10,253
Interest-bearing cash	113	1,958	969	3,696
Total Interest and Loan Fee Income	41,539	39,626	81,530	79,109
Interest Expense:
Deposits	424	478	858	963
Short-term borrowed funds	10	9	18	18
Other borrowed funds	1	0	1	0
Total Interest Expense	435	487	877	981
Net Interest and Loan Fee Income	41,104	39,139	80,653	78,128
Provision for Credit Losses	0	0	4,300	0
Net Interest and Loan Fee Income After Provision for Credit Losses	41,104	39,139	76,353	78,128
Noninterest Income:
Securities gains	71	26	71	50
Life insurance gains	0	433	0	433
Other noninterest income	821	889	2,408	1,847
Total Noninterest Income	9,554	12,288	21,202	23,867
Noninterest Expense:
Salaries and related benefits	12,900	13,090	25,918	26,198
Occupancy and equipment	4,791	4,916	9,723	9,964
Outsourced data processing services	2,324	2,367	4,729	4,736
Professional fees	643	481	1,032	1,146
Courier service	508	451	999	893
Amortization of identifiable intangibles	73	79	146	389
Loss contingency	0	553	0	553
Other noninterest expense	3,515	3,624	6,871	6,865
Total Noninterest Expense	24,754	25,561	49,418	50,744
Income Before Income Taxes	25,904	25,866	48,137	51,251
Provision for income taxes	6,342	6,241	11,613	11,980
Net Income	$ 19,562	$ 19,625	$ 36,524	$ 39,271
Average Common Shares Outstanding (in shares)	26,935	26,942	27,001	26,892
Average Diluted Common Shares Outstanding (in shares)	26,951	26,987	27,024	26,950
Per Common Share Data:
Basic earnings (in dollars per share)	$ 0.72	$ 0.73	$ 1.35	$ 1.46
Diluted earnings (in dollars per share)	0.72	0.73	1.35	1.46
Dividends paid (in dollars per share)	$ 0.41	$ 0.41	$ 0.82	$ 0.81
Deposit Account [Member]
Noninterest Income:
Noninterest income revenue	$ 3,151	$ 4,493	$ 7,399	$ 8,997
Credit Card, Merchant Discount [Member]
Noninterest Income:
Noninterest income revenue	2,277	2,657	4,635	5,215
Debit Card [Member]
Noninterest Income:
Noninterest income revenue	1,459	1,641	2,927	3,148
Fiduciary and Trust [Member]
Noninterest Income:
Noninterest income revenue	714	749	1,491	1,466
ATM Processing Fees [Member]
Noninterest Income:
Noninterest income revenue	518	722	1,097	1,355
Financial Service, Other [Member]
Noninterest Income:
Noninterest income revenue	420	585	926	1,162
Financial Services Commission [Member]
Noninterest Income:
Noninterest income revenue	$ 123	$ 93	$ 248	$ 194