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
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]    
Securities sold under agreements to repurchase $ 34,543 $ 59,281
Other short-term borrowings 602,000 517,500
Total short-term borrowings 636,543 576,781
Maximum month-end outstanding balance 696,529 678,262
Average outstanding balance during the period $ 586,476 $ 590,074
Average interest rate (year-to-date) 0.81% 0.49%
Average interest rate at end of period 1.02% 0.60%
Other short-term borrowings:    
FHLB $ 602,000 $ 517,500
Other lines of credit $ 0 $ 0