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SECURITIES - Securities Available for Sale (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Amortized cost and estimated fair value of securities available for sale [Abstract] |  |  |  |  |
Amortized Cost | $ 761,997,000 |  | $ 761,997,000 |  | $ 542,362,000
Unrealized Gains | 7,932,000 |  | 7,932,000 |  | 12,654,000
Unrealized Losses | 8,398,000 |  | 8,398,000 |  | 405,000
Estimated Fair Value | 761,531,000 |  | 761,531,000 |  | 554,611,000
Amortized Cost |  |  |  |  |
Within one year | 686,000 |  | 686,000 |  |
After one, but within five years | 75,962,000 |  | 75,962,000 |  |
After five, but within ten years | 20,712,000 |  | 20,712,000 |  |
After ten years | 470,000 |  | 470,000 |  |
Total | 97,830,000 |  | 97,830,000 |  |
Amortized Cost | 761,997,000 |  | 761,997,000 |  | 542,362,000
Fair Value |  |  |  |  |
Within one year | 689,000 |  | 689,000 |  |
After one, but within five years | 77,278,000 |  | 77,278,000 |  |
After five, but within ten years | 21,285,000 |  | 21,285,000 |  |
After ten years | 498,000 |  | 498,000 |  |
Total | 99,750,000 |  | 99,750,000 |  |
Fair value | 761,531,000 |  | 761,531,000 |  | 554,611,000
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] |  |  |  |  |
Proceeds form sale of securities resulting in gain (loss) | 0 | $ 0 | 0 | $ 0 |
U.S. Treasury notes and bonds |  |  |  |  |
Amortized cost and estimated fair value of securities available for sale [Abstract] |  |  |  |  |
Amortized Cost | 40,499,000 |  | 40,499,000 |  |
Unrealized Gains | 0 |  | 0 |  |
Unrealized Losses | 162,000 |  | 162,000 |  |
Estimated Fair Value | 40,337,000 |  | 40,337,000 |  |
Amortized Cost |  |  |  |  |
Amortized Cost | 40,499,000 |  | 40,499,000 |  |
Fair Value |  |  |  |  |
Fair value | 40,337,000 |  | 40,337,000 |  |
Mortgage-backed securities, residential |  |  |  |  |
Amortized cost and estimated fair value of securities available for sale [Abstract] |  |  |  |  |
Amortized Cost | 588,555,000 |  | 588,555,000 |  | 458,245,000
Unrealized Gains | 5,397,000 |  | 5,397,000 |  | 9,822,000
Unrealized Losses | 7,826,000 |  | 7,826,000 |  | 201,000
Estimated Fair Value | 586,126,000 |  | 586,126,000 |  | 467,866,000
Amortized Cost |  |  |  |  |
Without single maturity date | 588,555,000 |  | 588,555,000 |  |
Amortized Cost | 588,555,000 |  | 588,555,000 |  | 458,245,000
Fair Value |  |  |  |  |
Without single maturity date | 586,126,000 |  | 586,126,000 |  |
Fair value | 586,126,000 |  | 586,126,000 |  | 467,866,000
Obligations of states and political subdivisions |  |  |  |  |
Amortized cost and estimated fair value of securities available for sale [Abstract] |  |  |  |  |
Amortized Cost | 40,331,000 |  | 40,331,000 |  | 40,662,000
Unrealized Gains | 2,021,000 |  | 2,021,000 |  | 2,743,000
Unrealized Losses | 0 |  | 0 |  | 0
Estimated Fair Value | 42,352,000 |  | 42,352,000 |  | 43,405,000
Amortized Cost |  |  |  |  |
Amortized Cost | 40,331,000 |  | 40,331,000 |  | 40,662,000
Fair Value |  |  |  |  |
Fair value | 42,352,000 |  | 42,352,000 |  | 43,405,000
Corporate bonds and notes |  |  |  |  |
Amortized cost and estimated fair value of securities available for sale [Abstract] |  |  |  |  |
Amortized Cost | 17,000,000 |  | 17,000,000 |  | 9,000,000
Unrealized Gains | 116,000 |  | 116,000 |  | 47,000
Unrealized Losses | 55,000 |  | 55,000 |  | 12,000
Estimated Fair Value | 17,061,000 |  | 17,061,000 |  | 9,035,000
Amortized Cost |  |  |  |  |
Amortized Cost | 17,000,000 |  | 17,000,000 |  | 9,000,000
Fair Value |  |  |  |  |
Fair value | 17,061,000 |  | 17,061,000 |  | 9,035,000
SBA loan pools |  |  |  |  |
Amortized cost and estimated fair value of securities available for sale [Abstract] |  |  |  |  |
Amortized Cost | 75,612,000 |  | 75,612,000 |  | 34,455,000
Unrealized Gains | 398,000 |  | 398,000 |  | 42,000
Unrealized Losses | 355,000 |  | 355,000 |  | 192,000
Estimated Fair Value | 75,655,000 |  | 75,655,000 |  | 34,305,000
Amortized Cost |  |  |  |  |
Without single maturity date | 75,612,000 |  | 75,612,000 |  |
Amortized Cost | 75,612,000 |  | 75,612,000 |  | 34,455,000
Fair Value |  |  |  |  |
Without single maturity date | 75,655,000 |  | 75,655,000 |  |
Fair value | $ 75,655,000 |  | $ 75,655,000 |  | $ 34,305,000

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