Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Interest income:
Loans, including fees	$ 169,002	$ 186,870	$ 512,444	$ 561,990
Securities:
Taxable	22,560	32,122	71,950	87,125
Tax-exempt	58,073	57,328	175,968	175,067
Interest-bearing deposits	1,512	8,759	10,894	27,226
Federal funds sold and resell agreements	19	1,194	884	4,323
Total interest income	251,166	286,273	772,140	855,731
Interest expense:
Deposits	5,397	25,637	27,677	79,655
Federal funds purchased and repurchase agreements	482	5,040	4,005	15,276
Junior subordinated deferrable interest debentures	700	1,425	2,893	4,401
Subordinated notes	1,164	1,164	3,492	3,492
Federal Home Loan Bank advances	0	0	318	0
Total interest expense	7,743	33,266	38,385	102,824
Net interest income	243,423	253,007	733,755	752,907
Credit loss expense	20,302	8,001	227,474	25,404
Net interest income after credit loss expense	223,121	245,006	506,281	727,503
Non-interest income:
Trust and investment management fees	31,469	31,649	97,002	93,794
Service charges on deposit accounts	19,812	22,941	60,043	65,529
Insurance commissions and fees	11,456	11,683	38,609	40,207
Interchange and debit card transaction fees	3,503	4,117	9,724	11,265
Other charges, commissions and fees	8,370	10,108	25,398	28,103
Net gain (loss) on securities transactions	0	96	108,989	265
Other	8,991	8,630	34,352	29,484
Total non-interest income	83,601	89,224	374,117	268,647
Non-interest expense:
Salaries and wages	93,323	93,812	282,485	277,078
Employee benefits	16,074	21,002	59,824	64,579
Net occupancy	25,466	24,202	76,116	64,602
Technology, furniture and equipment	26,482	22,415	77,768	66,236
Deposit insurance	2,372	2,491	7,796	7,752
Intangible amortization	212	274	710	904
Other	38,221	44,668	121,293	132,722
Total non-interest expense	202,150	208,864	625,992	613,873
Income before income taxes	104,572	125,366	254,406	382,277
Income taxes	9,516	13,530	11,525	42,359
Net income	95,056	111,836	242,881	339,918
Preferred stock dividends	0	2,016	2,016	6,047
Redemption of preferred stock	0	0	5,514	0
Net income available to common shareholders	$ 95,056	$ 109,820	$ 235,351	$ 333,871
Earnings per common share:
Basic	$ 1.50	$ 1.74	$ 3.72	$ 5.28
Diluted	$ 1.50	$ 1.73	$ 3.71	$ 5.24