DEPOSITS (Deposit Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Deposits:
Non-interest-bearing accounts	$ 3,190,293	$ 2,619,618
Interest-bearing checking	853,594	1,159,846
Regular savings accounts	1,387,123	1,284,642
Money market accounts	1,557,951	1,637,092
Total interest-bearing transaction and saving accounts	3,798,668	4,081,580
Certificates of deposit less than or equal to $250,000	956,968	1,168,495
Certificates of deposit greater than $250,000	166,043	185,375
Total certificates of deposit	1,123,011	1,353,870
Total deposits	8,111,972	8,055,068
Included in total deposits:
Public fund transaction and savings accounts	201,665	209,430
Public fund interest-bearing certificates	26,734	31,281
Total public deposits	228,399	240,711
Total brokered deposits	$ 60,290	$ 162,936