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SECURITIES - Amortized cost and Fair values of securities with gross unrealized gains and losses (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Available-for-sale: |  |
Amortized Cost | $ 854,796 | $ 934,456
Gross Unrealized Gains | 12 | 106
Gross Unrealized Losses | (101,645) | (91,038)
Allowance for Credit Losses | 0 |
Fair Value | 753,163 | 843,524
Held-to-maturity |  |
Amortized Cost | 527,144 | 541,600
Gross Unrealized Gains | 6 | 195
Gross Unrealized Losses | (76,837) | (62,994)
Fair Value | 450,313 | 478,801
Allowance for Credit Losses | 0 |
U.S. Treasury |  |
Available-for-sale: |  |
Amortized Cost | 169,751 | 169,860
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (15,357) | (15,345)
Allowance for Credit Losses | 0 |
Fair Value | 154,394 | 154,515
U.S. government agency |  |
Available-for-sale: |  |
Amortized Cost | 55,483 | 59,291
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (4,768) | (4,134)
Allowance for Credit Losses | 0 |
Fair Value | 50,715 | 55,157
Held-to-maturity |  |
Amortized Cost | 88,442 | 88,424
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (12,392) | (9,728)
Fair Value | 76,050 | 78,696
Allowance for Credit Losses | 0 |
Municipal |  |
Available-for-sale: |  |
Amortized Cost | 231,444 | 275,972
Gross Unrealized Gains | 1 | 46
Gross Unrealized Losses | (36,244) | (32,189)
Allowance for Credit Losses | 0 |
Fair Value | 195,201 | 243,829
Held-to-maturity |  |
Amortized Cost | 39,344 | 42,167
Gross Unrealized Gains | 6 | 195
Gross Unrealized Losses | (1,686) | (314)
Fair Value | 37,664 | 42,048
Allowance for Credit Losses | 0 |
Agency residential |  |
Available-for-sale: |  |
Amortized Cost | 197,549 | 213,676
Gross Unrealized Gains | 9 | 5
Gross Unrealized Losses | (20,508) | (18,240)
Allowance for Credit Losses | 0 |
Fair Value | 177,050 | 195,441
Held-to-maturity |  |
Amortized Cost | 98,115 | 102,728
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (9,281) | (6,470)
Fair Value | 88,834 | 96,258
Allowance for Credit Losses | 0 |
Agency commercial |  |
Available-for-sale: |  |
Amortized Cost | 142,920 | 150,060
Gross Unrealized Gains | 2 | 0
Gross Unrealized Losses | (18,593) | (17,172)
Allowance for Credit Losses | 0 |
Fair Value | 124,329 | 132,888
Held-to-maturity |  |
Amortized Cost | 301,243 | 308,281
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (53,478) | (46,482)
Fair Value | 247,765 | 261,799
Allowance for Credit Losses | 0 |
Corporate |  |
Available-for-sale: |  |
Amortized Cost | 57,649 | 65,597
Gross Unrealized Gains | 0 | 55
Gross Unrealized Losses | (6,175) | (3,958)
Allowance for Credit Losses | 0 |
Fair Value | $ 51,474 | $ 61,694

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