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SECURITIES - Fair value of securities available for sale and related unrealized gain and loss (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | $ 1,412,498 | $ 1,498,626
Unrealized Gains | 4,484 | 3,989
Unrealized Losses | (157,845) | (172,134)
Fair Value | 1,259,137 | 1,330,481
Amortized Cost | 1,259,137 |
U.S. Government agencies |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 102,978 | 110,226
Unrealized Gains | 4 | 24
Unrealized Losses | (11,542) | (11,777)
Fair Value | 91,440 | 98,473
Mortgage Backed Securities - residential |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 653,507 | 711,131
Unrealized Gains | 53 | 133
Unrealized Losses | (83,675) | (91,016)
Fair Value | 569,885 | 620,248
Mortgage Backed Securities - commercial |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 7,919 | 10,103
Unrealized Gains | 0 | 0
Unrealized Losses | (436) | (426)
Fair Value | 7,483 | 9,677
Collateralized mortgage obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 209,398 | 228,344
Unrealized Gains | 6 | 60
Unrealized Losses | (28,575) | (24,919)
Fair Value | 180,829 | 203,485
State and municipal obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 397,413 | 396,522
Unrealized Gains | 1,407 | 745
Unrealized Losses | (28,009) | (37,114)
Fair Value | 370,811 | 360,153
Municipal taxable |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 39,872 | 39,321
Unrealized Gains | 12 | 41
Unrealized Losses | (5,599) | (6,847)
Fair Value | 34,285 | 32,515
U.S. Treasury |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 1,411 | 2,979
Unrealized Gains | 0 | 0
Unrealized Losses | (9) | (35)
Fair Value | 1,402 | 2,944
Collateralized debt obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 0 | 0
Unrealized Gains | 3,002 | 2,986
Unrealized Losses | 0 | 0
Fair Value | $ 3,002 | $ 2,986

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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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