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LOANS - Major Classifications of Loans and Lending Risk (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2019 USD ($)	Sep. 30, 2019 USD ($) family	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2015 USD ($)
Classifications of loans
Total loans		$ 3,500,968	$ 3,268,772
Net deferred loan costs and fees		7,364	7,039
Total loans held for investment		3,508,332	3,275,811
Allowance for loan losses	$ (31,171)	(32,173)	(31,418)	$ (31,869)	$ (31,652)	$ (31,707)
Loans, net		3,476,159	3,244,393
Commercial Real Estate
Classifications of loans
Mortgage loan reclassified from loans held for investment to loans held for sale		12,600
Loans held for investment to loans held for sale and written down		16,300
Mortgage loan, charge-off recognized	3,700
Commercial Real Estate \| Mortgage loans
Classifications of loans
Total loans		1,519,807	1,373,556
Allowance for loan losses	(10,878)	(11,929)	(10,792)	(11,409)	(11,206)	(11,048)
Lending Risk
Loan amount beyond which annual financial information is sought		1,000
Multi-family
Classifications of loans
Allowance for loan losses		(2,990)	(2,566)	(2,793)		(4,521)
Multi-family \| Mortgage loans
Classifications of loans
Total loans		673,909	585,827
Allowance for loan losses	(2,545)	$ (2,990)	(2,566)	(2,793)	(2,466)
Lending Risk
Number of families having income producing residential investment properties \| family		5
Residential real estate mortgage loans
Classifications of loans
Allowance for loan losses		$ (1,908)	(3,935)	(4,443)		(2,438)
Residential real estate mortgage loans \| Mortgage loans
Classifications of loans
Total loans		497,842	519,763
Allowance for loan losses	(2,620)	(1,908)	(3,935)	(4,443)	(4,237)
Commercial, industrial and agricultural loans
Classifications of loans
Total loans		667,949	645,724
Allowance for loan losses	(13,558)	(14,081)	(12,722)	(11,808)	(12,358)	(12,838)
Real estate construction and land loans
Classifications of loans
Total loans		116,463	123,393
Allowance for loan losses	(1,333)	(998)	(1,297)	(1,301)	(1,263)	(740)
Installment/consumer loans
Classifications of loans
Total loans		24,998	20,509
Allowance for loan losses	$ (237)	(267)	(106)	$ (115)	$ (122)	$ (122)
CNB
Classifications of loans
Addition in acquired loans recorded at fair value							$ 729,400
Fair value of loans acquired		$ 235,700	275,000
Maximum \| Multi-family \| Mortgage loans
Lending Risk
Loan-to-value ratio (as a percent)		75.00%
Home equity \| Residential real estate mortgage loans \| Mortgage loans
Classifications of loans
Total loans		$ 68,888	71,248
Home equity \| Minimum \| Residential real estate mortgage loans \| Mortgage loans
Lending Risk
Loan-to-value ratio (as a percent)		80.00%
Carrying Amount
Classifications of loans
Fair value of loans acquired		$ 3,476,159	3,244,393
Loans held for sale		$ 12,643	$ 0