BORROWING ARRANGEMENTS - Maturities Table (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Less than 1 Year	$ 373,188
1-2 Years	365,289
2-3 Years	11,483
3-4 Years	0
4-5 Years	0
Thereafter	5,915
Total	755,875
Federal funds purchased and repurchase agreements:
Debt Instrument [Line Items]
Less than 1 Year	36,686
1-2 Years	124
2-3 Years	0
3-4 Years	0
4-5 Years	0
Thereafter	0
Total	36,810
FHLB borrowings:
Debt Instrument [Line Items]
Less than 1 Year	336,502
1-2 Years	365,165
2-3 Years	11,483
3-4 Years	0
4-5 Years	0
Thereafter	5,915
Total	$ 719,065