CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Interest income:
Interest and fees on loans	$ 79,714	$ 78,565
Interest and dividends on taxable investments	15,175	15,329
Interest and dividends on nontaxable investments	2,776	3,101
Total interest income	97,665	96,995
Interest expense:
Interest on deposits	3,112	5,545
Interest on borrowings	268	558
Interest on subordinated notes payable	38	185
Interest on subordinated debt held by unconsolidated subsidiary trusts	293	653
Total interest expense	3,711	6,941
Net interest income	93,954	90,054
Provision for credit losses	(5,719)	5,594
Net interest income after provision for credit losses	99,673	84,460
Noninterest revenues:
Deposit service fees	14,080	16,283
Mortgage banking	688	916
Other banking services	854	895
Employee benefit services	26,533	25,366
Insurance services	8,153	8,058
Wealth management services	8,199	7,134
Unrealized gain (loss) on equity securities	24	(30)
Total noninterest revenues	58,531	58,622
Noninterest expenses:
Salaries and employee benefits	57,632	58,251
Occupancy and equipment	11,300	10,739
Data processing and communications	12,391	10,413
Amortization of intangible assets	3,351	3,667
Legal and professional fees	3,034	3,151
Business development and marketing	2,030	2,513
Acquisition expenses	27	369
Other expenses	3,481	4,560
Total noninterest expenses	93,246	93,663
Income before income taxes	64,958	49,419
Income taxes	12,108	9,285
Net income	$ 52,850	$ 40,134
Basic earnings per share (in dollars per share)	$ 0.98	$ 0.77
Diluted earnings per share (in dollars per share)	$ 0.97	$ 0.76