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SECURITIES - Securities Available for Sale (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Amortized cost and estimated fair value of securities available for sale [Abstract] |  |  |  |  |
Amortized Cost | $ 683,712,000 |  | $ 683,712,000 |  | $ 542,362,000
Unrealized Gains | 9,490,000 |  | 9,490,000 |  | 12,654,000
Unrealized Losses | 5,608,000 |  | 5,608,000 |  | 405,000
Estimated Fair Value | 687,594,000 |  | 687,594,000 |  | 554,611,000
Amortized Cost |  |  |  |  |
Within one year | 687,000 |  | 687,000 |  |
After one, but within five years | 55,036,000 |  | 55,036,000 |  |
After five, but within ten years | 14,719,000 |  | 14,719,000 |  |
After ten years | 470,000 |  | 470,000 |  |
Total | 70,912,000 |  | 70,912,000 |  |
Amortized Cost | 683,712,000 |  | 683,712,000 |  | 542,362,000
Fair Value |  |  |  |  |
Within one year | 691,000 |  | 691,000 |  |
After one, but within five years | 56,703,000 |  | 56,703,000 |  |
After five, but within ten years | 15,388,000 |  | 15,388,000 |  |
After ten years | 503,000 |  | 503,000 |  |
Total | 73,285,000 |  | 73,285,000 |  |
Fair value | 687,594,000 |  | 687,594,000 |  | 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 | 20,548,000 |  | 20,548,000 |  |
Unrealized Gains | 1,000 |  | 1,000 |  |
Unrealized Losses | 30,000 |  | 30,000 |  |
Estimated Fair Value | 20,519,000 |  | 20,519,000 |  |
Amortized Cost |  |  |  |  |
Amortized Cost | 20,548,000 |  | 20,548,000 |  |
Fair Value |  |  |  |  |
Fair value | 20,519,000 |  | 20,519,000 |  |
Mortgage-backed securities, residential |  |  |  |  |
Amortized cost and estimated fair value of securities available for sale [Abstract] |  |  |  |  |
Amortized Cost | 552,066,000 |  | 552,066,000 |  | 458,245,000
Unrealized Gains | 6,745,000 |  | 6,745,000 |  | 9,822,000
Unrealized Losses | 5,216,000 |  | 5,216,000 |  | 201,000
Estimated Fair Value | 553,595,000 |  | 553,595,000 |  | 467,866,000
Amortized Cost |  |  |  |  |
Without single maturity date | 552,066,000 |  | 552,066,000 |  |
Amortized Cost | 552,066,000 |  | 552,066,000 |  | 458,245,000
Fair Value |  |  |  |  |
Without single maturity date | 553,595,000 |  | 553,595,000 |  |
Fair value | 553,595,000 |  | 553,595,000 |  | 467,866,000
Obligations of states and political subdivisions |  |  |  |  |
Amortized cost and estimated fair value of securities available for sale [Abstract] |  |  |  |  |
Amortized Cost | 40,364,000 |  | 40,364,000 |  | 40,662,000
Unrealized Gains | 2,308,000 |  | 2,308,000 |  | 2,743,000
Unrealized Losses | 0 |  | 0 |  | 0
Estimated Fair Value | 42,672,000 |  | 42,672,000 |  | 43,405,000
Amortized Cost |  |  |  |  |
Amortized Cost | 40,364,000 |  | 40,364,000 |  | 40,662,000
Fair Value |  |  |  |  |
Fair value | 42,672,000 |  | 42,672,000 |  | 43,405,000
Corporate bonds and notes |  |  |  |  |
Amortized cost and estimated fair value of securities available for sale [Abstract] |  |  |  |  |
Amortized Cost | 10,000,000 |  | 10,000,000 |  | 9,000,000
Unrealized Gains | 129,000 |  | 129,000 |  | 47,000
Unrealized Losses | 35,000 |  | 35,000 |  | 12,000
Estimated Fair Value | 10,094,000 |  | 10,094,000 |  | 9,035,000
Amortized Cost |  |  |  |  |
Amortized Cost | 10,000,000 |  | 10,000,000 |  | 9,000,000
Fair Value |  |  |  |  |
Fair value | 10,094,000 |  | 10,094,000 |  | 9,035,000
SBA loan pools |  |  |  |  |
Amortized cost and estimated fair value of securities available for sale [Abstract] |  |  |  |  |
Amortized Cost | 60,734,000 |  | 60,734,000 |  | 34,455,000
Unrealized Gains | 307,000 |  | 307,000 |  | 42,000
Unrealized Losses | 327,000 |  | 327,000 |  | 192,000
Estimated Fair Value | 60,714,000 |  | 60,714,000 |  | 34,305,000
Amortized Cost |  |  |  |  |
Without single maturity date | 60,734,000 |  | 60,734,000 |  |
Amortized Cost | 60,734,000 |  | 60,734,000 |  | 34,455,000
Fair Value |  |  |  |  |
Without single maturity date | 60,714,000 |  | 60,714,000 |  |
Fair value | $ 60,714,000 |  | $ 60,714,000 |  | $ 34,305,000

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