SECURITIES - Securities Available for Sale (Details) - USD ($)	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	$ 289,595,000		$ 282,256,000
Unrealized Gains	9,757,000		3,146,000
Unrealized Losses	277,000		1,312,000
Estimated Fair Value	299,075,000		284,090,000
Amortized Cost [Abstract]
Within one year	475,000
After one, but within five years	10,439,000
After five, but within ten years	29,271,000
After ten years	1,049,000
Total	41,234,000
Amortized Cost	289,595,000		282,256,000
Fair Value [Abstract]
Within one year	475,000
After one, but within five years	10,779,000
After five, but within ten years	30,541,000
After ten years	1,080,000
Total	42,875,000
Estimated Fair Value	299,075,000		284,090,000
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]
Proceeds form sale of securities resulting in gain (loss)	0	$ 0
Mortgage-backed securities, residential
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	227,180,000		225,029,000
Unrealized Gains	8,025,000		1,471,000
Unrealized Losses	206,000		1,266,000
Estimated Fair Value	234,999,000		225,234,000
Amortized Cost [Abstract]
Without single maturity date	227,180,000
Amortized Cost	227,180,000		225,029,000
Fair Value [Abstract]
Without single maturity date	234,999,000
Estimated Fair Value	234,999,000		225,234,000
Obligations of states and political subdivisions
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	40,984,000		41,265,000
Unrealized Gains	1,641,000		1,580,000
Unrealized Losses	0		0
Estimated Fair Value	42,625,000		42,845,000
Amortized Cost [Abstract]
Amortized Cost	40,984,000		41,265,000
Fair Value [Abstract]
Estimated Fair Value	42,625,000		42,845,000
Corporate bonds and notes
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	250,000		250,000
Unrealized Gains	0		0
Unrealized Losses	0		0
Estimated Fair Value	250,000		250,000
Amortized Cost [Abstract]
Amortized Cost	250,000		250,000
Fair Value [Abstract]
Estimated Fair Value	250,000		250,000
SBA loan pools
Amortized cost and estimated fair value of securities available for sale [Abstract]
Amortized Cost	21,181,000		15,712,000
Unrealized Gains	91,000		95,000
Unrealized Losses	71,000		46,000
Estimated Fair Value	21,201,000		15,761,000
Amortized Cost [Abstract]
Without single maturity date	21,181,000
Amortized Cost	21,181,000		15,712,000
Fair Value [Abstract]
Without single maturity date	21,201,000
Estimated Fair Value	$ 21,201,000		$ 15,761,000

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Name:	us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).