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SECURITIES - Fair value of securities available for sale and related unrealized gain and loss (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Amortized cost and fair value of investments classified as available for sale |  |
Unrealized Gains | $ 3,989 | $ 30,126
Unrealized Losses | (172,134) | (10,182)
Securities available-for-sale | 1,330,481 | 1,359,514
Fair Value | 1,330,481 | 1,359,514
Amortized Cost | 1,498,626 | 1,339,570
U.S. Government agencies |  |
Amortized cost and fair value of investments classified as available for sale |  |
Unrealized Gains | 24 | 2,688
Unrealized Losses | (11,777) | (741)
Fair Value | 98,473 | 120,123
Amortized Cost | 110,226 | 118,176
Mortgage Backed Securities - residential |  |
Amortized cost and fair value of investments classified as available for sale |  |
Unrealized Gains | 133 | 4,387
Unrealized Losses | (91,016) | (6,879)
Fair Value | 620,248 | 626,428
Amortized Cost | 711,131 | 628,920
Mortgage Backed Securities - commercial |  |
Amortized cost and fair value of investments classified as available for sale |  |
Unrealized Gains | 0 | 191
Unrealized Losses | (426) | 0
Fair Value | 9,677 | 15,671
Amortized Cost | 10,103 | 15,480
Collateralized Mortgage Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Unrealized Gains | 60 | 1,272
Unrealized Losses | (24,919) | (1,768)
Fair Value | 203,485 | 175,005
Amortized Cost | 228,344 | 175,501
State and municipal obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Unrealized Gains | 745 | 17,833
Unrealized Losses | (37,114) | (578)
Fair Value | 360,153 | 380,098
Amortized Cost | 396,522 | 362,843
Municipal taxable |  |
Amortized cost and fair value of investments classified as available for sale |  |
Unrealized Gains | 41 | 396
Unrealized Losses | (6,847) | (215)
Fair Value | 32,515 | 38,626
Amortized Cost | 39,321 | 38,445
U.S. Treasury |  |
Amortized cost and fair value of investments classified as available for sale |  |
Unrealized Gains | 0 | 0
Unrealized Losses | (35) | (1)
Fair Value | 2,944 | 204
Amortized Cost | 2,979 | 205
Collateralized debt obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Unrealized Gains | 2,986 | 3,359
Unrealized Losses | 0 | 0
Fair Value | 2,986 | 3,359
Amortized Cost | $ 0 | $ 0

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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