PARENT COMPANY CONDENSED FINANCIAL STATEMENTS (Details 4) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of income
Interest expense	$ 29,425	$ 26,169	$ 25,281	$ 23,968	$ 23,536	$ 24,343	$ 27,953	$ 27,544	$ 104,843	$ 103,376	$ 112,820
Compensation and net occupancy reimbursement to subsidiary									61,453	61,292	63,815
Other expense									77,462	77,538	71,341
Income tax benefit	(50,403)	(13,321)	(39,632)	(37,155)	(56,680)	(44,892)	(45,673)	(46,799)	(140,511)	(194,044)	(101,145)
NET INCOME	$ 110,734	$ 110,143	$ 103,284	$ 107,516	$ 91,805	$ 94,097	$ 98,748	$ 100,027	431,677	384,677	345,878
Parent Company
Statement of income
Dividends from subsidiaries									100,107	88	111,701
Other income									610	625	7,414
Total income									100,717	713	119,115
Interest expense									5,017	4,636	4,823
Compensation and net occupancy reimbursement to subsidiary									5,001	5,386	4,039
Other expense									15,069	24,829	50,280
Total expense									25,087	34,851	59,142
Income (loss) before income tax benefit and equity in undistributed income of subsidiaries									75,630	(34,138)	59,973
Income tax benefit									26,041	30,849	80,674
Equity in undistributed income of subsidiaries									330,006	387,966	205,231
NET INCOME									$ 431,677	$ 384,677	$ 345,878