REPURCHASE AGREEMENTS (Details) - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements		$ 256,181	$ 245,868
Retail Customers | March 31, 2019
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	[1],[2]	256,181	245,868
Retail Customers | Obligations of states and political subdivisions | March 31, 2019
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	[1],[2]	1,409	1,455
Retail Customers | Mortgage-backed securities issued or guaranteed by U.S. government-sponsored enterprises | March 31, 2019
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	[1],[2]	126,267	125,590
Retail Customers | Collateralized mortgage obligations issued or guaranteed by U.S. government-sponsored enterprises | March 31, 2019
Assets Sold under Agreements to Repurchase [Line Items]
Repurchase Agreements	[1],[2]	128,505	118,823
Collateral Pledged [Member] | March 31, 2019
Assets Sold under Agreements to Repurchase [Line Items]
Certificates of Deposit, at Carrying Value		$ 1,000	$ 923

[1] (1)Presented within short-term borrowings on the consolidated statements of condition.

[2] (2)All customer repurchase agreements mature continuously or overnight for the dates indicated.