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FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS - Financial Data of Federal Home Loan Bank Advances (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Banking and Thrift [Abstract]      
Weighted-average interest rate at end of year 0.40% 0.29% 0.13%
Average interest rate during the year 0.38% 0.20% 0.36%
Average balance $ 553,162 $ 267,816 $ 74,712
Maximum amount outstanding at any month-end 1,355,000 633,000 250,000
Balance at end of year $ 930,000 $ 633,000 $ 250,000