PARENT COMPANY CONDENSED FINANCIAL STATEMENTS (Details 2) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
ASSETS
Cash and due from banks	$ 460,559	$ 340,717
Interest-bearing cash with banks	1,417,944	1,020,170
Cash and cash equivalents	1,878,503	1,360,887	$ 1,039,885	$ 895,820
Available-for-sale investment securities, fair value	3,335,795	3,773,226
Other assets	782,420	804,584
TOTAL	34,788,840	32,350,922	28,743,592
LIABILITIES
Long-term debt	186,327	206,084
Total liabilities	31,361,099	29,227,972
STOCKHOLDERS’ EQUITY
Common stock, $0.001 par value, 200,000,000 shares authorized; 164,604,072 and 164,246,517 shares issued in 2016 and 2015, respectively.	164	164
Additional paid-in capital	1,727,434	1,701,295
Retained earnings	2,187,676	1,872,594
Treasury stock at cost — 20,436,621 shares in 2016 and 20,337,284 shares in 2015.	(439,387)	(436,162)
Accumulated other comprehensive loss, net of tax	(48,146)	(14,941)
Total stockholders’ equity	3,427,741	3,122,950	2,856,111	2,366,373
TOTAL	34,788,840	32,350,922
Parent Company
ASSETS
Cash and due from banks	38,699	18,334
Interest-bearing cash with banks	565	564
Cash and cash equivalents	39,264	18,898	$ 211,053	$ 79,934
Available-for-sale investment securities, fair value	9,338	8,731
Investment in subsidiaries	3,552,659	3,233,206
Tax credit investments, net	32,245	47,488
Other assets	4,812	46,894
TOTAL	3,638,318	3,355,217
LIABILITIES
Long-term debt	186,327	206,084
Other liabilities	24,250	26,183
Total liabilities	210,577	232,267
STOCKHOLDERS’ EQUITY
Common stock, $0.001 par value, 200,000,000 shares authorized; 164,604,072 and 164,246,517 shares issued in 2016 and 2015, respectively.	164	164
Additional paid-in capital	1,727,434	1,701,295
Retained earnings	2,187,676	1,872,594
Treasury stock at cost — 20,436,621 shares in 2016 and 20,337,284 shares in 2015.	(439,387)	(436,162)
Accumulated other comprehensive loss, net of tax	(48,146)	(14,941)
Total stockholders’ equity	3,427,741	3,122,950
TOTAL	$ 3,638,318	$ 3,355,217