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 and Leases	$ 417,498	$ 439,012	$ 410,597
Income on Investment Securities
Available-for-Sale	61,294	62,174	50,152
Held-to-Maturity	66,055	81,616	84,310
Deposits	14	41	34
Funds Sold	902	3,553	3,723
Other	661	1,001	1,357
Total Interest Income	546,424	587,397	550,173
Interest Expense
Deposits	32,966	68,374	41,143
Securities Sold Under Agreements to Repurchase	15,281	17,522	18,519
Funds Purchased	95	840	609
Short-Term Borrowings	62	38	145
Other Debt	1,698	2,908	3,405
Total Interest Expense	50,102	89,682	63,821
Net Interest Income	496,322	497,715	486,352
Provision for Credit Losses	117,800	16,000	13,425
Net Interest Income After Provision for Credit Losses	378,522	481,715	472,927
Noninterest Income
Trust and Asset Management	43,456	44,233	43,877
Mortgage Banking	17,871	13,686	8,437
Service Charges on Deposit Accounts	24,910	30,074	28,811
Fees, Exchange, and Other Service Charges	47,056	57,893	57,482
Investment Securities Gains (Losses), Net	9,932	(3,986)	(3,938)
Annuity and Insurance	3,362	6,934	5,822
Bank-Owned Life Insurance	7,388	7,015	7,199
Other	30,434	27,489	21,233
Total Noninterest Income	184,409	183,338	168,923
Noninterest Expense
Salaries and Benefits	207,329	216,106	213,208
Net Occupancy	39,533	33,800	34,742
Net Equipment	35,448	29,295	23,852
Data Processing	18,499	18,757	17,846
Professional Fees	12,186	10,071	9,992
FDIC Insurance	5,780	5,192	7,732
Other	55,032	66,006	64,252
Total Noninterest Expense	373,807	379,227	371,624
Income Before Provision for Income Taxes	189,124	285,826	270,226
Provision for Income Taxes	35,320	59,913	50,624
Net Income	$ 153,804	$ 225,913	$ 219,602
Basic Earnings Per Share	$ 3.87	$ 5.59	$ 5.26
Diluted Earnings Per Share	3.86	5.56	5.23
Dividends Declared Per Share	$ 2.68	$ 2.59	$ 2.34
Basic Weighted Average Shares	39,726,210	40,384,328	41,714,770
Diluted Weighted Average Shares	39,892,107	40,649,570	41,999,399