BORROWED FUNDS (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Balance for the year		$ 5,835	$ 4,942
Average weighted balance		$ 22,481	$ 26,106
Average interest rate paid during the year		3.89%	3.53%
Average interest rate at year end		3.64%	3.67%
Revolving Advances [Member]
Balance for the year	[1]
Highest balance at any month-end	[1]		12,000
Average weighted balance	[1]		$ 2,367
Average interest rate paid during the year	[1]		2.19%
Average interest rate at year end	[1]
Federal Funds Lines [Member]
Balance for the year	[2]		$ 3,630
Highest balance at any month-end	[2]		3,630
Average weighted balance	[2]	$ 10	$ 109
Average interest rate paid during the year	[2]	3.32%	2.80%
Average interest rate at year end	[2]		3.28%
Loans Short-Term[Member]
Balance for the year	[3]		$ 2,000
Highest balance at any month-end	[3]	2,000	2,000
Average weighted balance	[3]	$ 975	$ 1,159
Average interest rate paid during the year	[3]	1.26%	1.43%
Average interest rate at year end	[3]		0.99%
Loans Long-Term [Member]
Balance for the year	[4]	$ 5,000	$ 5,000
Highest balance at any month-end	[4]	5,000	7,000
Average weighted balance	[4]	$ 5,000	$ 5,975
Average interest rate paid during the year	[4]	1.36%	1.28%
Average interest rate at year end	[4]	1.34%	1.34%
NPB Capital Trust I [Member]
Balance for the year	[5]	$ 11,341	$ 11,341
Highest balance at any month-end	[5]	11,341	11,341
Average weighted balance	[5]	$ 11,341	$ 11,341
Average interest rate paid during the year	[5]	5.09%	4.96%
Average interest rate at year end	[5]	4.59%	5.04%
NPB Capital Trust 2 [Member]
Balance for the year	[5]	$ 5,155	$ 5,155
Highest balance at any month-end	[5]	5,155	5,155
Average weighted balance	[5]	$ 5,155	$ 5,155
Average interest rate paid during the year	[5]	4.25%	4.08%
Average interest rate at year end	[5]	3.76%	4.21%

[1] The Bank has the ability to borrow up to an additional $154.4 million from the FHLB under a line of credit which is secured by a blanket lien on residential real estate loans. The Bank had no overnight borrowings subject to daily rate changes from the FHLB at December 31, 2019 or 2018. We have used our line of credit with FHLB to issue letters of credit totaling $17.0 million to the Treasury Board of Virginia for collateral on public funds deposited in the Bank. No draws on the letters of credit have been issued. The letters of credit are considered draws on our FHLB line of credit.

[2] Federal funds lines consist of $20.0 million in unsecured federal funds line of credit facilities with correspondent banks as of both December 31, 2019 and 2018, exclusive of any outstanding balance.

[3] At December 31, 2019, there were no short-term FHLB advance borrowings outstanding. Short-term FHLB advances at December 31, 2018 consisted of $2.0 million at a fixed rate of 0.99% due in 2019.

[4] At December 31, 2019 and 2018, long term FHLB advances consisted of $5.0 million at a fixed rate of 1.34% due in 2021.

[5] TPS I - On July 7, 2004, the Company completed the issuance of $11.3 million in floating rate trust preferred securities offered by its wholly owned subsidiary, NPB Capital Trust I (TPS I). The rate is determined quarterly and floats based on the 3 month LIBOR plus 260 basis points.