REVENUE FROM CONTRACTS WITH CUSTOMERS - Revenue By Operating Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation of Revenue [Line Items]
Gains (losses) on sales of other real estate	$ (1)	$ 123	$ (87)	$ 119
Net gains on sales of loans held for sale	69	79	146	184
Net gains on security transactions	0	0	19	0
Change in fair value of equity securities	(10)	2,141	106	2,165
Total non-interest income	4,956	7,381	14,967	18,181
Overdraft fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	959	1,035	2,703	2,939
Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	182	196	627	600
Interchange revenue from debit card transactions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	1,058	982	3,113	3,013
WMG fee income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	2,315	2,406	7,115	7,095
CFS fee and commission income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	145	120	502	365
Net gains (losses) on sales of OREO
Disaggregation of Revenue [Line Items]
Gains (losses) on sales of other real estate	(1)	123	(87)	119
Net gains on sales of loans
Disaggregation of Revenue [Line Items]
Net gains on sales of loans held for sale	69	79	146	184
Loan servicing fees
Disaggregation of Revenue [Line Items]
Fees and commissions, mortgage banking and servicing	25	22	76	67
Sale of securities
Disaggregation of Revenue [Line Items]
Net gains on security transactions	0	0	19	0
Other
Disaggregation of Revenue [Line Items]
Other income	214	277	647	1,634
Core Banking
Disaggregation of Revenue [Line Items]
Change in fair value of equity securities	3	2,140	103	2,148
Total non-interest income	2,564	4,987	7,544	10,992
Core Banking | Overdraft fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	959	1,035	2,703	2,939
Core Banking | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	182	196	627	600
Core Banking | Interchange revenue from debit card transactions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	1,058	982	3,113	3,013
Core Banking | WMG fee income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0	0	0
Core Banking | CFS fee and commission income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0	0	0
Core Banking | Net gains (losses) on sales of OREO
Disaggregation of Revenue [Line Items]
Gains (losses) on sales of other real estate	(1)	123	(87)	119
Core Banking | Net gains on sales of loans
Disaggregation of Revenue [Line Items]
Net gains on sales of loans held for sale	69	79	146	184
Core Banking | Loan servicing fees
Disaggregation of Revenue [Line Items]
Fees and commissions, mortgage banking and servicing	25	22	76	67
Core Banking | Sale of securities
Disaggregation of Revenue [Line Items]
Net gains on security transactions	0	0	19	0
Core Banking | Other
Disaggregation of Revenue [Line Items]
Other income	269	410	844	1,922
WMG
Disaggregation of Revenue [Line Items]
Change in fair value of equity securities	0	0	0	0
Total non-interest income	2,315	2,406	7,115	7,095
WMG | Overdraft fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0	0	0
WMG | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0	0	0
WMG | Interchange revenue from debit card transactions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0	0	0
WMG | WMG fee income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	2,315	2,406	7,115	7,095
WMG | CFS fee and commission income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0	0	0
WMG | Net gains (losses) on sales of OREO
Disaggregation of Revenue [Line Items]
Gains (losses) on sales of other real estate	0	0	0	0
WMG | Net gains on sales of loans
Disaggregation of Revenue [Line Items]
Net gains on sales of loans held for sale	0	0	0	0
WMG | Loan servicing fees
Disaggregation of Revenue [Line Items]
Fees and commissions, mortgage banking and servicing	0	0	0	0
WMG | Sale of securities
Disaggregation of Revenue [Line Items]
Net gains on security transactions	0	0	0	0
WMG | Other
Disaggregation of Revenue [Line Items]
Other income	0	0	0	0
Holding Company, CFS, and CRM
Disaggregation of Revenue [Line Items]
Change in fair value of equity securities	(13)	1	3	17
Total non-interest income	77	(12)	308	94
Holding Company, CFS, and CRM | Overdraft fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0	0	0
Holding Company, CFS, and CRM | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0	0	0
Holding Company, CFS, and CRM | Interchange revenue from debit card transactions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0	0	0
Holding Company, CFS, and CRM | WMG fee income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	0	0	0	0
Holding Company, CFS, and CRM | CFS fee and commission income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, excluding assessed tax	145	120	502	365
Holding Company, CFS, and CRM | Net gains (losses) on sales of OREO
Disaggregation of Revenue [Line Items]
Gains (losses) on sales of other real estate	0	0	0	0
Holding Company, CFS, and CRM | Net gains on sales of loans
Disaggregation of Revenue [Line Items]
Net gains on sales of loans held for sale	0	0	0	0
Holding Company, CFS, and CRM | Loan servicing fees
Disaggregation of Revenue [Line Items]
Fees and commissions, mortgage banking and servicing	0	0	0	0
Holding Company, CFS, and CRM | Sale of securities
Disaggregation of Revenue [Line Items]
Net gains on security transactions	0	0	0	0
Holding Company, CFS, and CRM | Other
Disaggregation of Revenue [Line Items]
Other income	$ (55)	$ (133)	$ (197)	$ (288)