FAIR VALUES OF FINANCIAL INSTRUMENTS - Summary of Estimated Fair Values of Company's Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Financial assets:
Federal funds sold		$ 387
Investment securities	$ 246,886	259,805
Financial liabilities:
Junior subordinated debt	5,923	5,897
Carrying Amount
Financial assets:
Cash and due from banks	130,964	44,308
Investment securities	260,939	274,214
Equity securities	19,398	19,315
Loans, net of allowance	1,797,314	1,681,275
Derivative financial instruments		687
Financial liabilities:
Deposits, noninterest-bearing	469,095	351,905
Deposits, interest-bearing	1,420,493	1,355,801
FHLB short-term advances and repurchase agreements	84,908	56,095
FHLB long-term advances	78,500	78,500
Junior subordinated debt	5,923	5,897
Subordinated debt	43,600	43,600
Derivative financial instruments	4,247
Estimated Fair Value
Financial assets:
Cash and due from banks	130,964	44,308
Federal funds sold		387
Investment securities	261,151	274,285
Equity securities	19,398	19,316
Loans, net of allowance	1,814,786	1,680,364
Derivative financial instruments		687
Financial liabilities:
Deposits, noninterest-bearing	469,095	351,905
Deposits, interest-bearing	1,485,774	1,368,194
FHLB short-term advances and repurchase agreements	84,908	56,095
FHLB long-term advances	77,870	76,635
Junior subordinated debt	3,863	7,747
Subordinated debt	42,480	56,399
Derivative financial instruments	4,247
Level 1 | Estimated Fair Value
Financial assets:
Cash and due from banks	130,964	44,308
Federal funds sold		387
Investment securities	0	0
Equity securities	2,518	2,097
Loans, net of allowance	0	0
Derivative financial instruments		0
Financial liabilities:
Deposits, noninterest-bearing	0	0
Deposits, interest-bearing	0	0
FHLB short-term advances and repurchase agreements	0	0
FHLB long-term advances	0	0
Junior subordinated debt	0	0
Subordinated debt	0	0
Derivative financial instruments	0
Level 2 | Estimated Fair Value
Financial assets:
Cash and due from banks	0	0
Federal funds sold		0
Investment securities	233,593	245,410
Equity securities	16,880	17,219
Loans, net of allowance	0	0
Derivative financial instruments		687
Financial liabilities:
Deposits, noninterest-bearing	469,095	351,905
Deposits, interest-bearing	0	0
FHLB short-term advances and repurchase agreements	84,908	56,095
FHLB long-term advances	0	0
Junior subordinated debt	0	0
Subordinated debt	42,480	56,399
Derivative financial instruments	4,247
Level 3 | Estimated Fair Value
Financial assets:
Cash and due from banks	0	0
Federal funds sold		0
Investment securities	27,558	28,875
Equity securities	0	0
Loans, net of allowance	1,814,786	1,680,364
Derivative financial instruments		0
Financial liabilities:
Deposits, noninterest-bearing	0	0
Deposits, interest-bearing	1,485,774	1,368,194
FHLB short-term advances and repurchase agreements	0	0
FHLB long-term advances	77,870	76,635
Junior subordinated debt	3,863	7,747
Subordinated debt	0	$ 0
Derivative financial instruments	$ 0