Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
INTEREST INCOME
Interest and Fees on Loans	$ 112,084	$ 91,745	$ 86,202
Interest on Federal Funds Sold and Other Short-term Investments	308	134	74
Interest and Dividends on Securities:
Taxable	12,398	10,898	9,638
Non-taxable	8,959	8,253	7,451
TOTAL INTEREST INCOME	133,749	111,030	103,365
INTEREST EXPENSE
Interest on Deposits	13,625	7,094	5,187
Interest on FHLB Advances and Other Borrowings	5,514	4,027	3,274
TOTAL INTEREST EXPENSE	19,139	11,121	8,461
NET INTEREST INCOME	114,610	99,909	94,904
Provision for Loan Losses	2,070	1,750	1,200
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	112,540	98,159	93,704
NON-INTEREST INCOME
Company Owned Life Insurance	1,243	1,341	987
Other Operating Income	2,785	2,641	3,703
Net Gains on Sales of Loans	3,004	3,280	3,359
Net Gains on Securities	706	596	1,979
TOTAL NON-INTEREST INCOME	37,070	31,854	32,013
NON-INTEREST EXPENSE
Salaries and Employee Benefits	51,306	46,642	43,961
Occupancy Expense	7,735	6,609	6,297
Furniture and Equipment Expense	3,142	2,621	2,261
FDIC Premiums	1,033	954	1,151
Data Processing Fees	6,942	4,276	5,686
Professional Fees	5,362	2,817	3,672
Advertising and Promotion	3,492	3,543	2,657
Intangible Amortization	1,752	942	1,062
Other Operating Expenses	12,789	9,399	9,840
TOTAL NON-INTEREST EXPENSE	93,553	77,803	76,587
Income before Income Taxes	56,057	52,210	49,130
Income Tax Expense	9,528	11,534	13,946
NET INCOME	$ 46,529	$ 40,676	$ 35,184
Basic Earnings per Share (in USD per share)	$ 1.99	$ 1.77	$ 1.57
Diluted Earnings per Share (in USD per share)	1.99	1.77	1.57
Dividends per Share (in USD per share)	$ 0.60	$ 0.52	$ 0.48
Trust and Investment Product Fees
NON-INTEREST INCOME
Non-interest Income	$ 6,680	$ 5,272	$ 4,644
Service Charges on Deposit Accounts
NON-INTEREST INCOME
Non-interest Income	7,044	6,178	5,973
Insurance Revenues
NON-INTEREST INCOME
Non-interest Income	8,330	7,979	7,741
Interchange Fee Income
NON-INTEREST INCOME
Non-interest Income	$ 7,278	$ 4,567	$ 3,627