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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

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