REVENUE FROM CONTRACTS WITH CUSTOMERS - Revenue By Operating Segment (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Total non-interest income	$ 5,475,000	$ 4,847,000
Overdraft fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, including assessed tax	965,000	979,000
Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, including assessed tax	199,000	205,000
Interchange revenue from debit card transactions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, including assessed tax	1,035,000	920,000
WMG fee income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, including assessed tax	2,316,000	2,109,000
CFS fee and commission income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, including assessed tax	110,000	139,000
Net gains on sales of OREO
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, including assessed tax	44,000	17,000
Net gains on sales of loans
Disaggregation of Revenue [Line Items]
Financial services revenue	46,000	69,000
Loan servicing fees
Disaggregation of Revenue [Line Items]
Financial services revenue	22,000	20,000
Other
Disaggregation of Revenue [Line Items]
Financial services revenue	738,000	389,000
Core Banking
Disaggregation of Revenue [Line Items]
Total non-interest income	3,183,000	2,605,000
Core Banking | Overdraft fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, including assessed tax	965,000	979,000
Core Banking | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, including assessed tax	199,000	205,000
Core Banking | Interchange revenue from debit card transactions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, including assessed tax	1,035,000	920,000
Core Banking | WMG fee income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, including assessed tax	0	0
Core Banking | CFS fee and commission income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, including assessed tax	0	0
Core Banking | Net gains on sales of OREO
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, including assessed tax	44,000	17,000
Core Banking | Net gains on sales of loans
Disaggregation of Revenue [Line Items]
Financial services revenue	46,000	69,000
Core Banking | Loan servicing fees
Disaggregation of Revenue [Line Items]
Financial services revenue	22,000	20,000
Core Banking | Other
Disaggregation of Revenue [Line Items]
Financial services revenue	872,000	395,000
WMG
Disaggregation of Revenue [Line Items]
Total non-interest income	2,316,000	2,109,000
WMG | Overdraft fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, including assessed tax	0	0
WMG | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, including assessed tax	0	0
WMG | Interchange revenue from debit card transactions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, including assessed tax	0	0
WMG | WMG fee income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, including assessed tax	2,316,000	2,109,000
WMG | CFS fee and commission income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, including assessed tax	0	0
WMG | Net gains on sales of OREO
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, including assessed tax	0	0
WMG | Net gains on sales of loans
Disaggregation of Revenue [Line Items]
Financial services revenue	0	0
WMG | Loan servicing fees
Disaggregation of Revenue [Line Items]
Financial services revenue	0	0
WMG | Other
Disaggregation of Revenue [Line Items]
Financial services revenue	0	0
Holding Company, CFS, and CRM
Disaggregation of Revenue [Line Items]
Total non-interest income	(24,000)	133,000
Holding Company, CFS, and CRM | Overdraft fees
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, including assessed tax	0	0
Holding Company, CFS, and CRM | Other
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, including assessed tax	0	0
Holding Company, CFS, and CRM | Interchange revenue from debit card transactions
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, including assessed tax	0	0
Holding Company, CFS, and CRM | WMG fee income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, including assessed tax	0	0
Holding Company, CFS, and CRM | CFS fee and commission income
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, including assessed tax	110,000	139,000
Holding Company, CFS, and CRM | Net gains on sales of OREO
Disaggregation of Revenue [Line Items]
Revenue from contract with customer, including assessed tax	0	0
Holding Company, CFS, and CRM | Net gains on sales of loans
Disaggregation of Revenue [Line Items]
Financial services revenue	0	0
Holding Company, CFS, and CRM | Loan servicing fees
Disaggregation of Revenue [Line Items]
Financial services revenue	0	0
Holding Company, CFS, and CRM | Other
Disaggregation of Revenue [Line Items]
Financial services revenue	$ (134,000)	$ (6,000)