Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Interest income
Loans and leases	$ 226,630	$ 216,404
Investment securities:
Total investment securities interest and dividend income	29,751	23,042
Overnight investments	4,476	3,666
Total interest income	260,857	243,112
Interest expense
Deposits	4,436	4,659
Short-term borrowings	580	434
Long-term obligations	5,498	5,299
Total interest expense	10,514	10,392
Net interest income	250,343	232,720
Provision (credit) for loan and lease losses	8,231	4,843
Net interest income after provision for loan and lease losses	242,112	227,877
Noninterest income
Gain on acquisitions	12,017	1,704
Cardholder services	21,258	19,358
Merchant services	24,987	21,977
Service charges on deposit accounts	22,142	21,850
Wealth management services	20,962	19,634
Securities gains (losses)	(24)	4,628
Other service charges and fees	7,601	6,989
Mortgage income	7,576	1,311
Insurance commissions	3,558	3,178
ATM income	1,773	1,765
Adjustments for FDIC shared-loss receivable	(1,628)	(2,533)
Net Impact from FDIC shared-loss termination	(45)	0
Other	7,115	5,421
Total noninterest income	127,292	105,282
Noninterest expense
Salaries and wages	112,263	103,899
Employee benefits	29,293	27,350
Occupancy expense	24,762	25,012
Equipment expense	24,588	22,345
Merchant processing	16,783	15,087
Cardholder processing	5,553	6,084
FDIC insurance expense	5,593	4,789
Foreclosure-related expenses	2,471	1,731
Merger-related expenses	833	38
Other	42,206	45,336
Total noninterest expense	264,345	251,671
Income before income taxes	105,059	81,488
Income taxes	37,438	29,416
Net income	$ 67,621	$ 52,072
Average shares outstanding (in shares)	12,010,405	12,010,405
Net income per share	$ 5.63	$ 4.34