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INVESTMENT SECURITIES- (Investment Portfolio Composition) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | ---
Available-for-sale |  |  |  |  |
Amortized Cost | $ 455,232 | $ 461,646 | $ 643,679 | $ 655,927 | $ 660,732
Unrealized Gains | 49 |  |  |  | 1,375
Unrealized Losses | 41,946 |  |  |  | 7,460
Allowance for Credit Loss | (41) |  |  |  | (36)
Fair Value | 413,294 | 416,745 | 601,405 | 624,361 | 654,611
Federal Home Loan Bank | 2,100 |  |  |  | 2,000
Federal Reserve Bank stock | 5,100 |  |  |  | 5,100
Held to Maturity |  |  |  |  |
Amortized Cost | 660,744 | 676,178 | 528,258 | 518,678 | 339,601
Unrealized Gains | 8 |  |  |  | 2,819
Unrealized Losses | 48,051 |  |  |  | 2,721
Fair value | 612,701 | $ 623,628 | $ 498,963 | $ 501,277 | 339,699
U.S. Government Treasury [Member] |  |  |  |  |
Available-for-sale |  |  |  |  |
Amortized Cost | 23,977 |  |  |  | 190,409
Unrealized Gains | 1 |  |  |  | 65
Unrealized Losses | 1,928 |  |  |  | 2,606
Allowance for Credit Loss | 0 |  |  |  | 0
Fair Value | 22,050 |  |  |  | 187,868
Held to Maturity |  |  |  |  |
Amortized Cost | 457,374 |  |  |  | 115,499
Unrealized Gains | 0 |  |  |  | 0
Unrealized Losses | 25,641 |  |  |  | 1,622
Fair value | 431,733 |  |  |  | 113,877
U.S. Government Agency [Member] |  |  |  |  |
Available-for-sale |  |  |  |  |
Amortized Cost | 198,888 |  |  |  | 238,490
Unrealized Gains | 27 |  |  |  | 1,229
Unrealized Losses | 12,863 |  |  |  | 2,141
Allowance for Credit Loss | 0 |  |  |  | 0
Fair Value | 186,052 |  |  |  | 237,578
States and Political Subdivisions [Member] |  |  |  |  |
Available-for-sale |  |  |  |  |
Amortized Cost | 47,197 |  |  |  | 47,762
Unrealized Gains | 0 |  |  |  | 44
Unrealized Losses | 6,855 |  |  |  | 811
Allowance for Credit Loss | 13 |  |  |  | (15)
Fair Value | 40,329 |  |  |  | 46,980
Mortgage-Backed Securities [Member] |  |  |  |  |
Available-for-sale |  |  |  |  |
Amortized Cost | 80,829 |  |  |  | 89,440
Unrealized Gains | 2 |  |  |  | 27
Unrealized Losses | 11,426 |  |  |  | 598
Allowance for Credit Loss | 0 |  |  |  | 0
Fair Value | 69,405 |  |  |  | 88,869
Held to Maturity |  |  |  |  |
Amortized Cost | 203,370 |  |  |  | 224,102
Unrealized Gains | 8 |  |  |  | 2,819
Unrealized Losses | 22,410 |  |  |  | 1,099
Fair value | 180,968 |  |  |  | 225,822
Corporate Debt Securities [Member] |  |  |  |  |
Available-for-sale |  |  |  |  |
Amortized Cost | 97,119 |  |  |  | 87,537
Unrealized Gains | 19 |  |  |  | 10
Unrealized Losses | 8,874 |  |  |  | 1,304
Allowance for Credit Loss | 28 |  |  |  | (21)
Fair Value | 88,236 |  |  |  | 86,222
Other Securities [Member] |  |  |  |  |
Available-for-sale |  |  |  |  |
Amortized Cost | 7,222 |  |  |  | 7,094
Unrealized Gains | 0 |  |  |  | 0
Unrealized Losses | 0 |  |  |  | 0
Allowance for Credit Loss | 0 |  |  |  | 0
Fair Value | $ 7,222 |  |  |  | $ 7,094

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