Annual report pursuant to Section 13 and 15(d)

AVAILABLE-FOR-SALE AND OTHER SECURITIES - Realized Securities Gains (Losses) (Details)

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AVAILABLE-FOR-SALE AND OTHER SECURITIES - Realized Securities Gains (Losses) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]      
Gross gains on sales of securities $ 23,095 $ 6,730 $ 17,729
Gross (losses) on sales of securities (21,060) (3,546) (175)
Net gain (loss) on sales of securities $ 2,035 $ 3,184 $ 17,554