CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Interest income:
Interest and fees on loans	$ 75,907	$ 78,720	$ 155,621	$ 157,285
Interest and dividends on taxable investments	16,789	15,423	31,964	30,752
Interest and dividends on nontaxable investments	2,664	3,049	5,440	6,150
Total interest income	95,360	97,192	193,025	194,187
Interest expense:
Interest on deposits	2,963	4,173	6,075	9,718
Interest on borrowings	253	430	521	988
Interest on subordinated notes payable	39	184	77	369
Interest on subordinated debt held by unconsolidated subsidiary trusts	0	454	293	1,107
Total interest expense	3,255	5,241	6,966	12,182
Net interest income	92,105	91,951	186,059	182,005
Provision for credit losses	(4,338)	9,774	(10,057)	15,368
Net interest income after provision for credit losses	96,443	82,177	196,116	166,637
Noninterest revenues:
Deposit service fees	14,236	12,179	28,316	28,462
Mortgage banking	331	1,375	1,019	2,291
Other banking services	980	755	1,834	1,650
Employee benefit services	27,477	24,068	54,010	49,434
Insurance services	8,209	8,183	16,362	16,241
Wealth management services	8,227	6,366	16,426	13,500
Unrealized gain (loss) on equity securities	0	12	24	(18)
Total noninterest revenues	59,460	52,938	117,991	111,560
Noninterest expenses:
Salaries and employee benefits	57,892	54,721	115,524	112,972
Occupancy and equipment	10,270	9,754	21,570	20,493
Data processing and communications	12,766	10,833	25,157	21,246
Amortization of intangible assets	3,246	3,524	6,597	7,191
Legal and professional fees	2,499	3,061	5,533	6,212
Business development and marketing	2,659	1,504	4,689	4,017
Acquisition expenses	4	3,372	31	3,741
Other expenses	4,207	4,134	7,688	8,694
Total noninterest expenses	93,543	90,903	186,789	184,566
Income before income taxes	62,360	44,212	127,318	93,631
Income taxes	14,416	8,964	26,524	18,249
Net income	$ 47,944	$ 35,248	$ 100,794	$ 75,382
Basic earnings per share (in dollars per share)	$ 0.89	$ 0.67	$ 1.86	$ 1.44
Diluted earnings per share (in dollars per share)	$ 0.88	$ 0.66	$ 1.85	$ 1.43