PARENT COMPANY CONDENSED FINANCIAL STATEMENTS (Details) - USD ($) $ / shares in Units, $ in Thousands		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents		$ 1,360,887		$ 1,039,885		$ 895,820	$ 1,323,106
Available-for-sale investment securities, at fair value		3,773,226		2,626,617
Other assets	[1]	992,040		1,084,171
TOTAL		32,350,922	[1]	28,743,592	[1]	24,732,216
LIABILITIES
Long-term debt		206,084		225,848
Total liabilities		29,227,972		25,887,481
STOCKHOLDERS’ EQUITY
Common stock, $0.001 par value, 200,000,000 shares authorized; 164,246,517 and 163,772,218 shares issued in 2015 and 2014, respectively.		$ 164		$ 164
Common stock, par value (in dollars per share)		$ 0.001		$ 0.001
Common stock, shares authorized		200,000,000		200,000,000
Common stock, shares issued		164,246,517		163,772,218
Additional paid in capital		$ 1,701,295		$ 1,677,767
Retained earnings	[1]	1,872,594		1,604,141
Treasury stock at cost—20,337,284 shares in 2015 and 20,189,989 shares in 2014.		$ (436,162)		$ (430,198)
Treasury stock, shares		20,337,284		20,189,989
Accumulated other comprehensive (loss) income, net of tax		$ (14,941)		$ 4,237		(30,459)	4,669
Total stockholders' equity	[1]	3,122,950		2,856,111		2,366,373	2,385,991
TOTAL	[1]	32,350,922		28,743,592
Parent Company
ASSETS
Cash and cash equivalents		18,898		211,053		$ 79,934	$ 64,489
Available-for-sale investment securities, at fair value		8,731		8,370
Investment in subsidiaries		3,233,206		2,847,227
Tax credit investments, net		47,488		41,054
Other assets		46,894		22,474
TOTAL		3,355,217		3,130,178
LIABILITIES
Long-term debt		206,084		225,848
Other liabilities		26,183		48,219
Total liabilities		232,267		274,067
STOCKHOLDERS’ EQUITY
Common stock, $0.001 par value, 200,000,000 shares authorized; 164,246,517 and 163,772,218 shares issued in 2015 and 2014, respectively.		$ 164		$ 164
Common stock, par value (in dollars per share)		$ 0.001		$ 0.001
Common stock, shares authorized		200,000,000		200,000,000
Common stock, shares issued		164,246,517		163,772,218
Additional paid in capital		$ 1,701,295		$ 1,677,767
Retained earnings		1,872,594		1,604,141
Treasury stock at cost—20,337,284 shares in 2015 and 20,189,989 shares in 2014.		$ (436,162)		$ (430,198)
Treasury stock, shares		20,337,284		20,189,989
Accumulated other comprehensive (loss) income, net of tax		$ (14,941)		$ 4,237
Total stockholders' equity		3,122,950		2,856,111
TOTAL		$ 3,355,217		$ 3,130,178

[1] Prior period was restated to reflect the retrospective application of adopting the new accounting guidance related to the Company’s investments in qualified affordable housing projects Accounting Standards Update (“ASU”) 2014-01. Please see Note 9 — Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net to the Consolidated Financial Statements for additional information.