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SECURITIES - Amortized cost and Fair values of securities with gross unrealized gains and losses (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022
--- | --- | --- | ---
Available-for-sale: |  |  |
Amortized Cost | $ 831,624 | $ 934,456 |
Gross Unrealized Gains | 99 | 106 |
Gross Unrealized Losses | (72,262) | (91,038) |
Allowance for Credit Losses | 0 |  |
Fair Value | 759,461 | 843,524 |
Held-to-maturity |  |  |
Amortized Cost | 521,439 | 541,600 | $ 114,850
Gross Unrealized Gains | 394 | 195 |
Gross Unrealized Losses | (55,337) | (62,994) |
Fair Value | 466,496 | 478,801 | 104,131
Allowance for Credit Losses | 0 |  |
U.S. Treasury |  |  |
Available-for-sale: |  |  |
Amortized Cost | 159,715 | 169,860 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | (11,093) | (15,345) |
Allowance for Credit Losses | 0 |  |
Fair Value | 148,622 | 154,515 |
U.S. government agency |  |  |
Available-for-sale: |  |  |
Amortized Cost | 55,359 | 59,291 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | (3,262) | (4,134) |
Allowance for Credit Losses | 0 |  |
Fair Value | 52,097 | 55,157 |
Held-to-maturity |  |  |
Amortized Cost | 88,448 | 88,424 | 78,841
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | (8,292) | (9,728) |
Fair Value | 80,156 | 78,696 | 71,048
Allowance for Credit Losses | 0 |  |
Municipal |  |  |
Available-for-sale: |  |  |
Amortized Cost | 229,030 | 275,972 |
Gross Unrealized Gains | 26 | 46 |
Gross Unrealized Losses | (23,499) | (32,189) |
Allowance for Credit Losses | 0 |  |
Fair Value | 205,557 | 243,829 |
Held-to-maturity |  |  |
Amortized Cost | 38,442 | 42,167 |
Gross Unrealized Gains | 394 | 195 |
Gross Unrealized Losses | (163) | (314) |
Fair Value | 38,673 | 42,048 |
Allowance for Credit Losses | 0 |  |
Agency residential |  |  |
Available-for-sale: |  |  |
Amortized Cost | 188,641 | 213,676 |
Gross Unrealized Gains | 61 | 5 |
Gross Unrealized Losses | (14,718) | (18,240) |
Allowance for Credit Losses | 0 |  |
Fair Value | 173,984 | 195,441 |
Held-to-maturity |  |  |
Amortized Cost | 95,828 | 102,728 | 8,175
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | (5,569) | (6,470) |
Fair Value | 90,259 | 96,258 | 7,651
Allowance for Credit Losses | 0 |  |
Agency commercial |  |  |
Available-for-sale: |  |  |
Amortized Cost | 141,214 | 150,060 |
Gross Unrealized Gains | 3 | 0 |
Gross Unrealized Losses | (14,205) | (17,172) |
Allowance for Credit Losses | 0 |  |
Fair Value | 127,012 | 132,888 |
Held-to-maturity |  |  |
Amortized Cost | 298,721 | 308,281 | 27,834
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | (41,313) | (46,482) |
Fair Value | 257,408 | 261,799 | $ 25,432
Allowance for Credit Losses | 0 |  |
Corporate |  |  |
Available-for-sale: |  |  |
Amortized Cost | 57,665 | 65,597 |
Gross Unrealized Gains | 9 | 55 |
Gross Unrealized Losses | (5,485) | (3,958) |
Allowance for Credit Losses | 0 |  |
Fair Value | $ 52,189 | $ 61,694 |

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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