Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest income
Loans and leases	$ 246,260	$ 219,314	$ 708,622	$ 651,160
Investment securities:
Total investment securities interest and dividend income	29,706	23,395	89,863	71,139
Overnight investments	8,367	3,785	19,247	10,676
Total interest income	284,333	246,494	817,732	732,975
Interest expense
Deposits	3,839	4,457	12,407	13,717
Short-term borrowings	1,429	540	3,185	1,428
Long-term obligations	5,890	5,648	17,013	17,072
Total interest expense	11,158	10,645	32,605	32,217
Net interest income	273,175	235,849	785,127	700,758
Provision (credit) for loan and lease losses	7,946	7,507	28,501	16,912
Net interest income after provision for loan and lease losses	265,229	228,342	756,626	683,846
Noninterest income
Gain on acquisitions	0	837	134,745	5,831
Cardholder services	24,461	21,537	70,006	61,949
Merchant services	25,879	25,179	77,456	71,392
Service charges on deposit accounts	25,951	23,154	73,955	66,888
Wealth management services	21,234	19,915	64,116	60,840
Securities gains (losses)	1,337	352	4,664	17,509
Other service charges and fees	7,073	7,567	21,302	21,693
Mortgage income	6,775	6,692	19,317	12,540
Insurance commissions	2,894	2,755	9,015	8,198
ATM income	2,596	1,908	6,882	5,518
Adjustments for FDIC shared-loss receivable	(1,770)	(2,773)	(4,671)	(7,673)
Net Impact from FDIC shared-loss termination	0	0	(45)	16,559
Other	8,957	10,718	24,137	22,129
Total noninterest income	125,387	117,841	500,879	363,373
Noninterest expense
Salaries and wages	121,086	107,762	351,518	315,720
Employee benefits	27,030	26,750	83,418	79,761
Occupancy expense	26,594	24,857	77,415	74,824
Equipment expense	23,887	23,736	73,129	68,796
Merchant processing	19,653	18,686	57,624	52,924
Cardholder processing	8,576	7,416	23,092	22,075
FDIC insurance expense	5,449	5,796	16,747	15,173
Foreclosure-related expenses	3,443	4,039	9,582	9,732
Merger-related expenses	562	3,764	8,248	5,187
Other	50,687	44,427	136,145	133,015
Total noninterest expense	286,967	267,233	836,918	777,207
Income before income taxes	103,649	78,950	420,587	270,012
Income taxes	36,585	27,546	151,242	97,220
Net income	$ 67,064	$ 51,404	$ 269,345	$ 172,792
Average shares outstanding (in shares)	12,010,405	12,010,405	12,010,405	12,010,405
Net income per share	$ 5.58	$ 4.28	$ 22.43	$ 14.39