FAIR VALUE - RECURRING BASIS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Financial assets:
Available-for-sale debt securities	$ 572,015		$ 572,015			$ 475,738
Mortgage loans held for sale, at fair value	32,739	$ 7,862	32,739	$ 7,862	$ 13,883	8,971	$ 12,653	$ 5,761
Consumer loans held for investment	1,187		1,187			1,922
Equity securities with readily determinable fair value:
Equity securities with readily determinable fair value	3,367		3,367			2,806
U.S. Treasury securities and U.S. Government agencies
Financial assets:
Available-for-sale debt securities	257,302		257,302			216,873
Private label mortgage backed security
Financial assets:
Available-for-sale debt securities	3,595		3,595			3,712
Mortgage backed securities - residential
Financial assets:
Available-for-sale debt securities	230,694		230,694			169,209
Collateralized mortgage obligations
Financial assets:
Available-for-sale debt securities	66,580		66,580			72,811
Corporate bonds
Financial assets:
Available-for-sale debt securities	9,844		9,844			9,058
Trust preferred security
Financial assets:
Available-for-sale debt securities	4,000		4,000			4,075
Freddie Mac preferred stock
Equity securities with readily determinable fair value:
Equity securities with readily determinable fair value	882		882			410
Community Reinvestment Act mutual fund
Equity securities with readily determinable fair value:
Equity securities with readily determinable fair value	2,485		2,485			2,396
Recurring basis
Financial assets:
Available-for-sale debt securities	572,015		572,015			475,738
Mortgage loans held for sale, at fair value	32,739		32,739			8,971
Consumer loans held for investment	1,187		1,187			1,922
Rate lock loan commitments	1,193		1,193			356
Mandatory forward contracts	211		211
Interest rate swap agreements	6,483		6,483			1,264
Equity securities with readily determinable fair value:
Equity securities with readily determinable fair value	3,367		3,367			2,806
Financial Liabilities:
Mandatory forward contracts						262
Interest rate swap agreements	6,620		6,620			1,149
Transfers between Level 1, 2 or 3	0	$ 0	0	$ 0
Recurring basis | U.S. Treasury securities and U.S. Government agencies
Financial assets:
Available-for-sale debt securities	257,302		257,302			216,873
Recurring basis | Private label mortgage backed security
Financial assets:
Available-for-sale debt securities	3,595		3,595			3,712
Recurring basis | Mortgage backed securities - residential
Financial assets:
Available-for-sale debt securities	230,694		230,694			169,209
Recurring basis | Collateralized mortgage obligations
Financial assets:
Available-for-sale debt securities	66,580		66,580			72,811
Recurring basis | Corporate bonds
Financial assets:
Available-for-sale debt securities	9,844		9,844			9,058
Recurring basis | Trust preferred security
Financial assets:
Available-for-sale debt securities	4,000		4,000			4,075
Recurring basis | Freddie Mac preferred stock
Equity securities with readily determinable fair value:
Equity securities with readily determinable fair value	882		882			410
Recurring basis | Community Reinvestment Act mutual fund
Equity securities with readily determinable fair value:
Equity securities with readily determinable fair value	2,485		2,485			2,396
Recurring basis | Fair Value, Inputs, Level 1
Equity securities with readily determinable fair value:
Equity securities with readily determinable fair value	2,485		2,485			2,396
Recurring basis | Fair Value, Inputs, Level 1 | Community Reinvestment Act mutual fund
Equity securities with readily determinable fair value:
Equity securities with readily determinable fair value	2,485		2,485			2,396
Recurring basis | Fair Value, Inputs, Level 2
Financial assets:
Available-for-sale debt securities	564,420		564,420			467,951
Mortgage loans held for sale, at fair value	32,739		32,739			8,971
Rate lock loan commitments	1,193		1,193			356
Mandatory forward contracts	211		211
Interest rate swap agreements	6,483		6,483			1,264
Equity securities with readily determinable fair value:
Equity securities with readily determinable fair value	882		882			410
Financial Liabilities:
Mandatory forward contracts						262
Interest rate swap agreements	6,620		6,620			1,149
Recurring basis | Fair Value, Inputs, Level 2 | U.S. Treasury securities and U.S. Government agencies
Financial assets:
Available-for-sale debt securities	257,302		257,302			216,873
Recurring basis | Fair Value, Inputs, Level 2 | Mortgage backed securities - residential
Financial assets:
Available-for-sale debt securities	230,694		230,694			169,209
Recurring basis | Fair Value, Inputs, Level 2 | Collateralized mortgage obligations
Financial assets:
Available-for-sale debt securities	66,580		66,580			72,811
Recurring basis | Fair Value, Inputs, Level 2 | Corporate bonds
Financial assets:
Available-for-sale debt securities	9,844		9,844			9,058
Recurring basis | Fair Value, Inputs, Level 2 | Freddie Mac preferred stock
Equity securities with readily determinable fair value:
Equity securities with readily determinable fair value	882		882			410
Recurring basis | Fair Value, Inputs, Level 3
Financial assets:
Available-for-sale debt securities	7,595		7,595			7,787
Consumer loans held for investment	1,187		1,187			1,922
Recurring basis | Fair Value, Inputs, Level 3 | Private label mortgage backed security
Financial assets:
Available-for-sale debt securities	3,595		3,595			3,712
Recurring basis | Fair Value, Inputs, Level 3 | Trust preferred security
Financial assets:
Available-for-sale debt securities	$ 4,000		$ 4,000			$ 4,075