FAIR VALUE (Details 7) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financial Liabilities:
Other borrowings		$ 20,000
Estimated Fair Value
Financial Assets:
Cash and cash equivalents	895,820	1,323,106
Short-term investments	257,473	366,378
Securities purchased under resale agreements	1,279,406	1,442,302
Loans held for sale	212,469	180,349
Loans receivable, net	16,741,674	14,743,218
Investment in Federal Home Loan Bank stock	62,330	107,275
Investment in Federal Reserve Bank stock	48,333	48,003
Accrued interest receivable	116,314	94,837
Financial Liabilities:
Demand, savings and money market deposits	14,588,570	12,187,740
Time deposits	5,791,659	6,115,530
Federal Home Loan Bank advances	308,521	333,060
Securities sold under repurchase agreements	1,134,774	1,173,830
Other borrowings		20,000
Accrued interest payable	11,178	10,855
Long-term debt	184,415	83,762
Level 1
Financial Assets:
Cash and cash equivalents	895,820	1,323,106
Level 2
Financial Assets:
Short-term investments	257,473	366,378
Securities purchased under resale agreements	1,279,406	1,442,302
Loans held for sale	212,469	180,349
Investment in Federal Home Loan Bank stock	62,330	107,275
Investment in Federal Reserve Bank stock	48,333	48,003
Accrued interest receivable	116,314	94,837
Financial Liabilities:
Demand, savings and money market deposits	14,588,570	12,187,740
Federal Home Loan Bank advances	308,521	333,060
Securities sold under repurchase agreements	1,134,774	1,173,830
Other borrowings		20,000
Accrued interest payable	11,178	10,855
Long-term debt	184,415	83,762
Level 3
Financial Assets:
Loans receivable, net	16,741,674	14,743,218
Financial Liabilities:
Time deposits	$ 5,791,659	$ 6,115,530