Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest income
Loans and leases	$ 874,892	$ 700,525	$ 757,197
Investment securities:
U. S. Treasury	15,353	11,656	1,645
Government agency	6,843	7,410	12,265
Residential mortgage-backed securities	65,815	36,492	22,642
State, county and municipal	33	13	12
Other	206	640	320
Total investment securities interest and dividend income	88,250	56,211	36,884
Overnight investments	6,067	3,712	2,723
Total interest income	969,209	760,448	796,804
Interest expense
Deposits	21,230	24,786	34,495
Short-term borrowings	4,660	9,177	2,724
Long-term obligations	18,414	16,388	19,399
Total interest expense	44,304	50,351	56,618
Net interest income (loss)	924,905	710,097	740,186
Provision for loan and lease losses	20,664	640	(32,255)
Net interest income after provision for loan and lease losses	904,241	709,457	772,441
Noninterest income
Gain on acquisition	42,930	0	0
Cardholder and merchant services	77,342	59,607	48,360
Merchant Discount Fees	84,207	64,075	56,024
Service charges on deposit accounts	90,546	69,100	60,661
Wealth management services	82,865	66,115	59,628
Fees from processing services	180	17,989	22,821
Securities gains (losses)	10,817	29,096	0
Other service charges and fees	23,807	17,760	15,696
Mortgage income	18,168	5,828	11,065
Insurance commissions	11,757	11,129	10,694
ATM income	7,119	5,388	5,026
Adjustments to FDIC receivable	(19,009)	(32,151)	(72,342)
Other	36,359	29,277	49,749
Total noninterest income	467,088	343,213	267,382
Noninterest expense
Salaries and wages	429,742	349,279	308,936
Employee benefits	113,309	79,898	90,479
Occupancy expense	98,191	86,775	75,713
Equipment expense	92,639	79,084	75,538
FDIC insurance expense	18,340	12,979	10,175
Foreclosure-related expenses	2,662	17,368	17,134
Merger-related expenses	14,174	13,064	391
Other	269,858	210,629	193,014
Total noninterest expense	1,038,915	849,076	771,380
Income before income taxes	332,414	203,594	268,443
Income taxes	122,028	65,032	101,574
Income taxes	121,478	98,371	53,928
Net income	$ 210,386	$ 138,562	$ 166,869
Average shares outstanding (in shares)	12,010,405	10,221,721	9,618,952
Cash dividends (in dollars per share)	$ 1.20	$ 1.20	$ 1.20
Net income per share	$ 17.52	$ 13.56	$ 17.35