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INVESTMENT SECURITIES- Investment Portfolio Composition (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Available-for-sale |  |
Amortized Cost | $ 660,732 | $ 321,191
Unrealized Gains | 1,375 | 3,863
Unrealized Losses | 7,460 | 184
Allowance for Credit Loss | (36) | 0
Fair Value | 654,611 | 324,870
Federal Home Loan Bank | 2,000 | 2,900
Federal Reserve Bank stock | 5,100 | 4,800
Held to Maturity |  |
Amortized Cost | 339,601 | 169,939
Unrealized Gains | 2,819 | 5,236
Unrealized Losses | 2,721 | 0
Fair value | 339,699 | 175,175
U.S. Government Treasury [Member] |  |
Available-for-sale |  |
Amortized Cost | 190,409 | 103,547
Unrealized Gains | 65 | 972
Unrealized Losses | 2,606 | 0
Allowance for Credit Loss | 0 | 0
Fair Value | 187,868 | 104,519
Held to Maturity |  |
Amortized Cost | 115,499 | 5,001
Unrealized Gains | 0 | 13
Unrealized Losses | 1,622 | 0
Fair value | 113,877 | 5,014
U.S. Government Agency [Member] |  |
Available-for-sale |  |
Amortized Cost | 238,490 | 205,972
Unrealized Gains | 1,229 | 2,743
Unrealized Losses | 2,141 | 184
Allowance for Credit Loss | 0 | 0
Fair Value | 237,578 | 208,531
States and Political Subdivisions [Member] |  |
Available-for-sale |  |
Amortized Cost | 47,762 | 3,543
Unrealized Gains | 44 | 89
Unrealized Losses | 811 | 0
Allowance for Credit Loss | (15) | 0
Fair Value | 46,980 | 3,632
Mortgage-Backed Securities [Member] |  |
Available-for-sale |  |
Amortized Cost | 89,440 | 456
Unrealized Gains | 27 | 59
Unrealized Losses | 598 | 0
Allowance for Credit Loss | 0 | 0
Fair Value | 88,869 | 515
Held to Maturity |  |
Amortized Cost | 224,102 | 164,938
Unrealized Gains | 2,819 | 5,223
Unrealized Losses | 1,099 | 0
Fair value | 225,822 | 170,161
Corporate Debt Securities [Member] |  |
Available-for-sale |  |
Amortized Cost | 87,537 |
Unrealized Gains | 10 |
Unrealized Losses | 1,304 |
Allowance for Credit Loss | (21) |
Fair Value | 86,222 |
Other Securities [Member] |  |
Available-for-sale |  |
Amortized Cost | 7,094 | 7,673
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Allowance for Credit Loss | 0 | 0
Fair Value | $ 7,094 | $ 7,673

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