COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Credit Extensions
Allowance for loan losses	$ 260,238	$ 264,959
Unfunded Lending Commitments
Credit Extensions
Allowance for loan losses	21,414	20,360	$ 15,632	$ 12,712
Unfunded Lending Commitments | Accrued Expenses and Other Liabilities
Credit Extensions
Allowance for loan losses	20,800	19,800
Undisbursed Loan Commitments
Credit Extensions
Loan commitments	3,859,835	3,370,271
Commercial and Standby Letters of Credit
Credit Extensions
Commercial and standby letters of credit (“SBLCs”)	1,254,590	$ 1,293,547
Commercial Letters Of Credit
Credit Extensions
Commercial and standby letters of credit (“SBLCs”)	45,800
Standby Letters of Credit
Credit Extensions
Commercial and standby letters of credit (“SBLCs”)	$ 1,210,000