Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
INTEREST INCOME
Interest and Fees on Loans	$ 151,658	$ 152,481	$ 112,084
Interest on Federal Funds Sold and Other Short-term Investments	382	522	308
Interest and Dividends on Securities:
Taxable	10,447	13,910	12,398
Non-taxable	11,882	9,561	8,959
TOTAL INTEREST INCOME	174,369	176,474	133,749
INTEREST EXPENSE
Interest on Deposits	13,696	23,805	13,625
Interest on FHLB Advances and Other Borrowings	5,430	7,444	5,514
TOTAL INTEREST EXPENSE	19,126	31,249	19,139
NET INTEREST INCOME	155,243	145,225	114,610
Provision for Credit Losses	17,550	5,325	2,070
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES	137,693	139,900	112,540
NON-INTEREST INCOME
Company Owned Life Insurance	2,307	2,005	1,243
Other Operating Income	3,388	3,229	2,785
Net Gains on Sales of Loans	9,908	4,633	3,004
Net Gains on Securities	4,081	1,248	706
TOTAL NON-INTEREST INCOME	54,474	45,501	37,070
NON-INTEREST EXPENSE
Salaries and Employee Benefits	68,112	63,885	51,306
Occupancy Expense	10,033	9,988	7,735
Furniture and Equipment Expense	3,991	3,788	3,142
FDIC Premiums	740	533	1,033
Data Processing Fees	6,889	7,927	6,942
Professional Fees	3,998	4,674	5,362
Advertising and Promotion	3,589	4,230	3,492
Intangible Amortization	3,539	3,721	1,752
Other Operating Expenses	16,232	15,416	12,789
TOTAL NON-INTEREST EXPENSE	117,123	114,162	93,553
Income before Income Taxes	75,044	71,239	56,057
Income Tax Expense	12,834	12,017	9,528
NET INCOME	$ 62,210	$ 59,222	$ 46,529
Basic Earnings per Share (in USD per share)	$ 2.34	$ 2.29	$ 1.99
Diluted Earnings per Share (in USD per share)	2.34	2.29	1.99
Dividends per Share (in USD per share)	$ 0.76	$ 0.68	$ 0.60
Trust and Investment Product Fees
NON-INTEREST INCOME
Non-interest Income	$ 8,005	$ 7,278	$ 6,680
Service Charges on Deposit Accounts
NON-INTEREST INCOME
Non-interest Income	7,334	8,718	7,044
Insurance Revenues
NON-INTEREST INCOME
Non-interest Income	8,922	8,940	8,330
Interchange Fee Income
NON-INTEREST INCOME
Non-interest Income	$ 10,529	$ 9,450	$ 7,278