Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
INTEREST AND DIVIDEND INCOME
Interest and Fees on Loans	$ 70,202	$ 62,823	$ 56,856
Interest on Deposits at Banks	348	152	94
Interest and Dividends on Investment Securities:
Fully Taxable	7,884	7,934	8,043
Exempt from Federal Taxes	6,223	6,006	5,745
Total Interest and Dividend Income	84,657	76,915	70,738
INTEREST EXPENSE
Interest-Bearing Checking Accounts	1,510	1,280	1,276
Savings Deposits	1,371	932	741
Time Deposits over $250,000	282	187	76
Other Time Deposits	950	924	1,022
Federal Funds Purchased and Securities Sold Under Agreements to Repurchase	44	33	20
Federal Home Loan Bank Advances	2,083	1,340	1,097
Junior Subordinated Obligations Issued to Unconsolidated Subsidiary Trusts	766	660	581
Total Interest Expense	7,006	5,356	4,813
NET INTEREST INCOME	77,651	71,559	65,925
Provision for Loan Losses	2,736	2,033	1,347
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	74,915	69,526	64,578
NONINTEREST INCOME
Income From Fiduciary Activities	8,417	7,783	7,762
Fees for Other Services to Customers	9,591	9,469	9,220
Net (Loss) Gain on Securities Transactions	(448)	(22)	129
Insurance Commissions	8,612	8,668	8,967
Net Gain on Sales of Loans	546	821	692
Other Operating Income	927	1,113	1,354
Total Noninterest Income	27,645	27,832	28,124
NONINTEREST EXPENSE
Salaries and Employee Benefits	37,166	34,330	33,064
Occupancy Expenses, Net	9,560	9,402	9,267
FDIC Assessments	891	1,076	1,186
Other Operating Expense	15,088	14,801	13,913
Total Noninterest Expense	62,705	59,609	57,430
INCOME BEFORE PROVISION FOR INCOME TAXES	39,855	37,749	35,272
Provision for Income Taxes	10,529	11,215	10,610
NET INCOME	$ 29,326	$ 26,534	$ 24,662
Average Shares Outstanding:
Basic Shares, in Shares	13,893	13,792	13,680
Diluted Shares, in Shares	13,986	13,880	13,730
Per Common Share:
Basic Earnings, in USD Per Share	$ 2.11	$ 1.92	$ 1.80
Diluted Earnings, In USD Per Share	$ 2.10	$ 1.91	$ 1.80