Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest income
Loans and leases	$ 235,732	$ 215,442	$ 462,362	$ 431,846
Investment securities:
Total investment securities interest and dividend income	30,406	24,702	60,157	47,744
Overnight investments	6,404	3,225	10,880	6,891
Total interest income	272,542	243,369	533,399	486,481
Interest expense
Deposits	4,132	4,601	8,568	9,260
Short-term borrowings	1,176	454	1,756	888
Long-term obligations	5,625	6,125	11,123	11,424
Total interest expense	10,933	11,180	21,447	21,572
Net interest income	261,609	232,189	511,952	464,909
Provision (credit) for loan and lease losses	12,324	4,562	20,555	9,405
Net interest income after provision for loan and lease losses	249,285	227,627	491,397	455,504
Noninterest income
Gain on acquisitions	122,728	3,290	134,745	4,994
Cardholder services	24,287	21,054	45,545	40,412
Merchant services	26,590	24,236	51,577	46,213
Service charges on deposit accounts	25,862	21,884	48,004	43,734
Wealth management services	21,920	21,291	42,882	40,925
Securities gains (losses)	3,351	12,529	3,327	17,157
Other service charges and fees	6,628	7,137	14,229	14,126
Mortgage income	4,966	4,537	12,542	5,848
Insurance commissions	2,563	2,265	6,121	5,443
ATM income	2,513	1,845	4,286	3,610
Adjustments for FDIC shared-loss receivable	(1,273)	(2,367)	(2,901)	(4,900)
Net Impact from FDIC shared-loss termination	0	16,559	(45)	16,559
Other	8,065	5,990	15,180	11,411
Total noninterest income	248,200	140,250	375,492	245,532
Noninterest expense
Salaries and wages	118,169	104,059	230,432	207,958
Employee benefits	27,095	25,661	56,388	53,011
Occupancy expense	26,059	24,955	50,821	49,967
Equipment expense	24,654	22,715	49,242	45,060
Merchant processing	19,677	17,925	37,971	34,238
Cardholder processing	7,709	7,372	14,516	14,659
FDIC insurance expense	5,705	4,588	11,298	9,377
Foreclosure-related expenses	580	(1,116)	3,051	615
Merger-related expenses	6,853	1,385	7,686	1,423
Other	49,105	50,759	88,546	93,666
Total noninterest expense	285,606	258,303	549,951	509,974
Income before income taxes	211,879	109,574	316,938	191,062
Income taxes	77,219	40,258	114,657	69,674
Net income	$ 134,660	$ 69,316	$ 202,281	$ 121,388
Average shares outstanding (in shares)	12,010,405	12,010,405	12,010,405	12,010,405
Net income per share	$ 11.21	$ 5.77	$ 16.84	$ 10.11