Quarterly report pursuant to Section 13 or 15(d)

BORROWINGS (Short-Term Borrowings) (Details)

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BORROWINGS (Short-Term Borrowings) (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]    
Securities sold under agreements to repurchase $ 64,225 $ 84,977
Other short-term borrowings 601,500 304,000
Total short-term borrowings 665,725 388,977
Maximum month-end outstanding balance 678,262 445,761
Average outstanding balance during the period $ 583,418 $ 379,783
Average interest rate (year-to-date) 0.48% 0.25%
Average interest rate at end of period 0.48% 0.27%
Other short-term borrowings:    
Federal funds purchased $ 6,000 $ 0
FHLB 579,500 304,000
Other lines of credit $ 16,000 $ 0