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INVESTMENT SECURITIES - Total investment securities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Contractual maturities of securities
Available for Sale, Cost Basis, Within 1 year	$ 2,000
Available for Sale, Cost Basis, After 1 year but within 5 years	23,016
Available for Sale, Cost Basis, After 5 years but within 10 years	41,070
Available for Sale, Cost Basis, After 10 years but within 15 years	23,018
Available for Sale, Cost Basis, Over 15 years	50,473
Available for Sale, Cost Basis, Total	$ 139,577	$ 148,514
Available for Sale, Within 1 year, Yield	2.89%
Available for Sale, After 1 year but within 5 years, Yield	3.33%
Available for Sale, After 5 year but within 10 years, Yield	3.59%
Available for Sale, After 10 years but within 15 years, Yield	2.83%
Available for Sale, Over 15 years, Yield	2.89%
Available for Sale, Yield, Total	3.16%
Available for Sale, Fair Value, Within 1 year	$ 2,003
Available for Sale, Fair Value, After 1 year but within 5 years	23,147
Available for Sale, Fair Value, After 5 years but within 10 years	41,708
Available for Sale, Fair Value, After 10 years but within 15 years	23,538
Available for Sale, Fair Value, Over 15 years	51,353
Available for Sale, Fair Value, Total	141,749	146,731
Held to Maturity, Cost Basis, After 1 year but within 5 years	7,544
Held to Maturity, Cost Basis, After 5 years but within 10 years	19,538
Held to Maturity, Cost Basis, After 10 years but within 15 years	7,282
Held to Maturity, Cost Basis, Over 15 years	5,572
Held to Maturity, Cost Basis, Total	39,936	40,760
Held to Maturity, Fair Value, After 1 year but within 5 years	7,606
Held to Maturity, Fair Value, After 5 years but within 10 years	20,243
Held to Maturity, Fair Value, After 10 years but within 15 years	7,562
Held to Maturity, Fair Value, Over 15 years	5,671
Held to Maturity, Fair Value, Total	$ 41,082	40,324
Held to Maturity, After 1 year but within 5 years, Yield	2.96%
Held to Maturity, After 5 years but within 10 years, Yield	3.53%
Held to Maturity, After 10 years but within 15 years, Yield	3.95%
Held to Maturity, Over 15 years, Yield	3.31%
Held to Maturity, Yield, Total	3.47%
U.S. Agency
Contractual maturities of securities
Available for Sale, Cost Basis, After 5 years but within 10 years	$ 2,557
Available for Sale, Cost Basis, Over 15 years	2,527
Available for Sale, Cost Basis, Total	$ 5,084	7,685
Available for Sale, After 5 year but within 10 years, Yield	2.93%
Available for Sale, Over 15 years, Yield	2.68%
Available for Sale, Yield, Total	2.81%
Available for Sale, Fair Value, After 5 years but within 10 years	$ 2,570
Available for Sale, Fair Value, Over 15 years	2,546
Available for Sale, Fair Value, Total	5,116	7,529
Corporate Bonds And Other Securities
Contractual maturities of securities
Available for Sale, Cost Basis, Within 1 year	1,500
Available for Sale, Cost Basis, After 1 year but within 5 years	18,695
Available for Sale, Cost Basis, After 5 years but within 10 years	19,574
Available for Sale, Cost Basis, Total	$ 39,769
Available for Sale, Within 1 year, Yield	3.10%
Available for Sale, After 1 year but within 5 years, Yield	3.43%
Available for Sale, After 5 year but within 10 years, Yield	4.11%
Available for Sale, Yield, Total	3.75%
Available for Sale, Fair Value, Within 1 year	$ 1,503
Available for Sale, Fair Value, After 1 year but within 5 years	18,755
Available for Sale, Fair Value, After 5 years but within 10 years	19,572
Available for Sale, Fair Value, Total	39,830
Held to Maturity, Cost Basis, After 1 year but within 5 years	3,000
Held to Maturity, Cost Basis, After 5 years but within 10 years	3,032
Held to Maturity, Cost Basis, Total	6,032
Held to Maturity, Fair Value, After 1 year but within 5 years	2,953
Held to Maturity, Fair Value, After 5 years but within 10 years	3,090
Held to Maturity, Fair Value, Total	$ 6,043
Held to Maturity, After 1 year but within 5 years, Yield	2.95%
Held to Maturity, After 5 years but within 10 years, Yield	4.40%
Held to Maturity, Yield, Total	3.68%
U.S. Agency mortgage-backed securities
Contractual maturities of securities
Available for Sale, Cost Basis, After 1 year but within 5 years	$ 1,200
Available for Sale, Cost Basis, After 5 years but within 10 years	7,882
Available for Sale, Cost Basis, After 10 years but within 15 years	23,018
Available for Sale, Cost Basis, Over 15 years	47,946
Available for Sale, Cost Basis, Total	$ 80,046	90,169
Available for Sale, After 1 year but within 5 years, Yield	2.46%
Available for Sale, After 5 year but within 10 years, Yield	2.99%
Available for Sale, After 10 years but within 15 years, Yield	2.83%
Available for Sale, Over 15 years, Yield	2.90%
Available for Sale, Yield, Total	2.88%
Available for Sale, Fair Value, After 1 year but within 5 years	$ 1,213
Available for Sale, Fair Value, After 5 years but within 10 years	8,075
Available for Sale, Fair Value, After 10 years but within 15 years	23,538
Available for Sale, Fair Value, Over 15 years	48,807
Available for Sale, Fair Value, Total	81,633	89,527
Held to Maturity, Cost Basis, After 1 year but within 5 years	1,977
Held to Maturity, Cost Basis, After 10 years but within 15 years	2,232
Held to Maturity, Cost Basis, Over 15 years	5,257
Held to Maturity, Cost Basis, Total	9,466	9,983
Held to Maturity, Fair Value, After 1 year but within 5 years	2,009
Held to Maturity, Fair Value, After 10 years but within 15 years	2,353
Held to Maturity, Fair Value, Over 15 years	5,351
Held to Maturity, Fair Value, Total	$ 9,713	$ 9,929
Held to Maturity, After 1 year but within 5 years, Yield	2.50%
Held to Maturity, After 10 years but within 15 years, Yield	3.62%
Held to Maturity, Over 15 years, Yield	3.30%
Held to Maturity, Yield, Total	3.21%
Municipal
Contractual maturities of securities
Available for Sale, Cost Basis, Within 1 year	$ 500
Available for Sale, Cost Basis, After 1 year but within 5 years	3,121
Available for Sale, Cost Basis, After 5 years but within 10 years	11,057
Available for Sale, Cost Basis, Total	$ 14,678
Available for Sale, Within 1 year, Yield	2.25%
Available for Sale, After 1 year but within 5 years, Yield	3.09%
Available for Sale, After 5 year but within 10 years, Yield	3.26%
Available for Sale, Yield, Total	3.19%
Available for Sale, Fair Value, Within 1 year	$ 500
Available for Sale, Fair Value, After 1 year but within 5 years	3,179
Available for Sale, Fair Value, After 5 years but within 10 years	11,491
Available for Sale, Fair Value, Total	15,170
Held to Maturity, Cost Basis, After 1 year but within 5 years	2,567
Held to Maturity, Cost Basis, After 5 years but within 10 years	16,506
Held to Maturity, Cost Basis, After 10 years but within 15 years	5,050
Held to Maturity, Cost Basis, Over 15 years	315
Held to Maturity, Cost Basis, Total	24,438
Held to Maturity, Fair Value, After 1 year but within 5 years	2,644
Held to Maturity, Fair Value, After 5 years but within 10 years	17,153
Held to Maturity, Fair Value, After 10 years but within 15 years	5,209
Held to Maturity, Fair Value, Over 15 years	320
Held to Maturity, Fair Value, Total	$ 25,326
Held to Maturity, After 1 year but within 5 years, Yield	3.33%
Held to Maturity, After 5 years but within 10 years, Yield	3.37%
Held to Maturity, After 10 years but within 15 years, Yield	4.10%
Held to Maturity, Over 15 years, Yield	3.50%
Held to Maturity, Yield, Total	3.52%

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