Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Interest income
Interest and fees on loans	$ 158,854	$ 164,871
Interest on federal funds sold and other short-term investments	3,965	5,837
Interest and dividends on securities:
Taxable	16,969	17,363
Tax-exempt	694	1,026
Total interest income	180,482	189,097
Interest expense
Interest on deposits	27,477	32,638
Interest on short-term borrowings	458	691
Interest on long-term borrowings	11,029	11,600
Total interest expense	38,964	44,929
Net interest income	141,518	144,168
Provision for credit losses	27,119	4,996
Net interest income after provision for credit losses	114,399	139,172
Other income
Income from bank-owned life insurance	2,388	1,827
Net investment securities gains (losses)	196	(159)
Other income	724	356
Total other income	36,806	31,223
Other expense
Employee compensation	44,541	38,949
Employee benefits	10,786	9,431
Net occupancy expense	9,062	8,751
Other real estate owned (OREO) expense	906	1,416
Equipment expense	3,845	3,315
Data processing expense	5,506	5,162
Bankcard processing expense	477	480
FDIC insurance expense	2,400	3,300
Other expense	23,610	18,621
Total other expense	101,133	89,425
Income before income taxes	50,072	80,970
Income taxes	9,889	17,328
Net income	$ 40,183	$ 63,642
Earnings per common share:
Basic	$ 0.40	$ 0.62
Diluted	$ 0.40	$ 0.62
Average outstanding shares:
Basic	101,295,073	101,894,786
Diluted	101,399,181	102,162,704
Fees From Trust Services [Member]
Other income
Revenue from contract	$ 3,483	$ 3,264
Fees from Brokerage Services [Member]
Other income
Revenue from contract	2,916	2,524
Fees from Deposit Services [Member]
Other income
Revenue from contract	7,957	8,053
Bankcard Fees and Merchant Discounts [Member]
Other income
Revenue from contract	993	1,156
Other Service Charges, Commissions, and Fees [Member]
Other income
Revenue from contract	518	521
Mortgage Banking [Member]
Other income
Revenue from contract	$ 17,631	$ 13,681