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, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Securities sold under agreements to repurchase $ 50,299 $ 49,152
Other short-term borrowings 742,900 745,000
Total short-term borrowings 793,199 794,152
Maximum month-end outstanding balance 1,265,110 794,152
Average outstanding balance during the period $ 1,133,761 $ 602,553
Average interest rate (during the period) 1.67% 1.00%
Average interest rate at end of period 1.81% 1.32%