Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Interest Income
Interest and fees on LHFS & LHFI	$ 274,433	$ 263,582	$ 258,550
Interest and fees on acquired loans	51,152	76,736	76,336
Interest on securities:
Taxable	80,730	80,148	72,818
Tax exempt	4,323	4,869	5,145
Interest on federal funds sold and securities purchased under reverse repurchase agreements	8	23	31
Other interest income	1,579	1,524	1,466
Total Interest Income	412,225	426,882	414,346
Interest Expense
Interest on deposits	12,598	15,323	19,718
Interest on federal funds purchased and securities sold under repurchase agreements	801	550	379
Other interest expense	7,061	5,673	5,762
Total Interest Expense	20,460	21,546	25,859
Net Interest Income	391,765	405,336	388,487
Provision for loan losses, LHFI	8,375	1,211	(13,421)
Provision for loan losses, acquired loans	3,425	6,171	6,039
Net Interest Income After Provision for Loan Losses	379,965	397,954	395,869
Noninterest Income
Service charges on deposit accounts	47,366	48,671	51,576
Bank card and other fees	28,298	32,966	35,961
Mortgage banking, net	30,176	24,780	33,504
Insurance commissions	36,424	33,468	30,826
Wealth management	31,369	32,343	29,480
Other, net	(484)	614	(7,973)
Securities gains, net		300	485
Total Noninterest Income	173,149	173,142	173,859
Noninterest Expense
Salaries and employee benefits	230,198	226,694	221,727
Services and fees	57,534	56,598	53,904
Net occupancy - premises	25,318	26,468	25,961
Equipment expense	23,859	23,860	24,538
ORE/Foreclosure expense	4,903	11,321	15,039
FDIC assessment expense	10,728	10,197	9,001
Other expense	49,122	53,867	65,561
Total Noninterest Expense	401,662	409,005	415,731
Income Before Income Taxes	151,452	162,091	153,997
Income taxes	35,414	38,529	36,937
Net Income	$ 116,038	$ 123,562	$ 117,060
Earnings Per Share
Basic	$ 1.72	$ 1.83	$ 1.75
Diluted	$ 1.71	$ 1.83	$ 1.75