Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest income
Loans and leases	$ 251,982	$ 226,630
Investment securities:
Total investment securities interest and dividend income	35,020	29,751
Overnight investments	5,599	4,476
Total interest income	292,601	260,857
Interest expense
Deposits	3,756	4,436
Short-term borrowings	1,434	580
Long-term obligations	2,974	5,498
Total interest expense	8,164	10,514
Net interest income	284,437	250,343
Provision (credit) for loan and lease losses	7,605	8,231
Net interest income after provision for loan and lease losses	276,832	242,112
Noninterest income
Gain on acquisitions	0	12,017
Cardholder services	14,782	11,907
Merchant services	6,177	6,693
Service charges on deposit accounts	26,543	22,142
Wealth management services	23,569	20,962
Securities gains (losses), net	0	(24)
Marketable equity securities gain (loss), net	971	0
Other service charges and fees	7,480	7,601
Mortgage income	4,237	7,576
Insurance commissions	3,776	3,558
ATM income	2,171	1,773
Adjustments for FDIC shared-loss receivable	(1,478)	(1,628)
Net Impact from FDIC shared-loss termination	0	(45)
Gain (Loss) on Extinguishment of Debt	25,814	0
Other	8,642	7,115
Total noninterest income	122,684	99,647
Noninterest expense
Salaries and wages	129,203	116,362
Employee benefits	32,091	27,178
Occupancy expense	27,954	24,762
Equipment expense	24,974	24,588
Merchant processing		18,300
Cardholder processing		6,800
FDIC insurance expense	5,733	5,593
Foreclosure-related expenses	4,146	3,763
Merger-related expenses	598	833
Other	43,364	33,621
Total noninterest expense	268,063	236,700
Income before income taxes	131,453	105,059
Income taxes	31,222	37,438
Net income	$ 100,231	$ 67,621
Average shares outstanding (in shares)	12,010,405	12,010,405
Net income per share	$ 8.35	$ 5.63