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SECURITIES - Securities Available for Sale (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Amortized cost and estimated fair value of debt securities available-for-sale |  |
Amortized Cost | $ 795,409,000 | $ 542,362,000
Estimated Fair Value | 792,026,000 | 554,611,000
Unrealized Gains | 6,587,000 | 12,654,000
Unrealized Losses | 9,970,000 | 405,000
Amortized Cost |  |
Within one year | 1,302,000 |
After one, but within five years | 37,598,000 |
After five, but within ten years | 25,087,000 |
After ten years | 470,000 |
Total | 795,409,000 | 542,362,000
Fair Value |  |
Within one year | 1,307,000 |
After one, but within five years | 39,099,000 |
After five, but within ten years | 25,652,000 |
After ten years | 500,000 |
Total | 792,026,000 | 554,611,000
Proceeds from sales and calls of securities resulting in gains or losses |  |
Proceeds | 0 | 0
U.S. treasury notes and bonds |  |
Amortized cost and estimated fair value of debt securities available-for-sale |  |
Amortized Cost | 61,084,000 | 0
Estimated Fair Value | 60,431,000 | 0
Unrealized Gains | 27,000 | 0
Unrealized Losses | 680,000 | 0
Amortized Cost |  |
Without single maturity date | 59,676,000 |
Total | 61,084,000 | 0
Fair Value |  |
Without single maturity date | 59,024,000 |
Total | 60,431,000 | 0
Mortgage-backed securities, residential |  |
Amortized cost and estimated fair value of debt securities available-for-sale |  |
Amortized Cost | 582,060,000 | 458,245,000
Estimated Fair Value | 577,361,000 | 467,866,000
Unrealized Gains | 4,032,000 | 9,822,000
Unrealized Losses | 8,731,000 | 201,000
Amortized Cost |  |
Without single maturity date | 582,060,000 |
Total | 582,060,000 | 458,245,000
Fair Value |  |
Without single maturity date | 577,361,000 |
Total | 577,361,000 | 467,866,000
Obligations of states and political subdivisions |  |
Amortized cost and estimated fair value of debt securities available-for-sale |  |
Amortized Cost | 40,299,000 | 40,662,000
Estimated Fair Value | 42,303,000 | 43,405,000
Unrealized Gains | 2,004,000 | 2,743,000
Unrealized Losses | 0 | 0
Amortized Cost |  |
Total | 40,299,000 | 40,662,000
Fair Value |  |
Total | 42,303,000 | 43,405,000
Corporate bonds and notes |  |
Amortized cost and estimated fair value of debt securities available-for-sale |  |
Amortized Cost | 22,750,000 | 9,000,000
Estimated Fair Value | 22,848,000 | 9,035,000
Unrealized Gains | 180,000 | 47,000
Unrealized Losses | 82,000 | 12,000
Amortized Cost |  |
Total | 22,750,000 | 9,000,000
Fair Value |  |
Total | 22,848,000 | 9,035,000
SBA loan pools |  |
Amortized cost and estimated fair value of debt securities available-for-sale |  |
Amortized Cost | 89,216,000 | 34,455,000
Estimated Fair Value | 89,083,000 | 34,305,000
Unrealized Gains | 344,000 | 42,000
Unrealized Losses | 477,000 | 192,000
Amortized Cost |  |
Without single maturity date | 89,216,000 |
Total | 89,216,000 | 34,455,000
Fair Value |  |
Without single maturity date | 89,083,000 |
Total | $ 89,083,000 | $ 34,305,000

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