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SECURITIES - Available for Sale Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Available for sale: |  |
Less than 12 months, Estimated Fair Value | $ 175,474 | $ 99,812
Less than 12 months, Gross Unrealized Losses | (778) | (779)
Greater than 12 months, Estimated Fair Value | 214,908 | 424,638
Greater than 12 months, Gross Unrealized Losses | (4,619) | (16,685)
U.S. Treasury securities |  |
Available for sale: |  |
Less than 12 months, Estimated Fair Value | 50,822 |
Less than 12 months, Gross Unrealized Losses | (11) |
U.S. GSE securities |  |
Available for sale: |  |
Less than 12 months, Estimated Fair Value | 0 | 0
Less than 12 months, Gross Unrealized Losses | 0 | 0
Greater than 12 months, Estimated Fair Value | 4,995 | 29,050
Greater than 12 months, Gross Unrealized Losses | (5) | (947)
State and municipal obligations |  |
Available for sale: |  |
Less than 12 months, Estimated Fair Value | 4,982 | 6,655
Less than 12 months, Gross Unrealized Losses | (42) | (15)
Greater than 12 months, Estimated Fair Value | 76 | 21,273
Greater than 12 months, Gross Unrealized Losses | (1) | (339)
U.S. GSE residential mortgage-backed securities |  |
Available for sale: |  |
Less than 12 months, Estimated Fair Value | 2,935 | 0
Less than 12 months, Gross Unrealized Losses | (30) | 0
Greater than 12 months, Estimated Fair Value | 39,617 | 88,762
Greater than 12 months, Gross Unrealized Losses | (438) | (3,036)
U.S. GSE residential collateralized mortgage obligations |  |
Available for sale: |  |
Less than 12 months, Estimated Fair Value | 81,377 | 46,452
Less than 12 months, Gross Unrealized Losses | (480) | (141)
Greater than 12 months, Estimated Fair Value | 93,403 | 172,468
Greater than 12 months, Gross Unrealized Losses | (984) | (5,813)
U.S. GSE commercial mortgage-backed securities |  |
Available for sale: |  |
Less than 12 months, Estimated Fair Value | 6,648 | 0
Less than 12 months, Gross Unrealized Losses | (70) | 0
Greater than 12 months, Estimated Fair Value | 0 | 3,508
Greater than 12 months, Gross Unrealized Losses | 0 | (28)
U.S. GSE commercial collateralized mortgage obligations |  |
Available for sale: |  |
Less than 12 months, Estimated Fair Value | 28,710 | 46,705
Less than 12 months, Gross Unrealized Losses | (145) | (623)
Greater than 12 months, Estimated Fair Value | 9,614 | 43,933
Greater than 12 months, Gross Unrealized Losses | (144) | (1,916)
Other asset backed securities |  |
Available for sale: |  |
Less than 12 months, Estimated Fair Value | 0 | 0
Less than 12 months, Gross Unrealized Losses | 0 | 0
Greater than 12 months, Estimated Fair Value | 23,401 | 23,219
Greater than 12 months, Gross Unrealized Losses | (849) | (1,031)
Corporate bonds |  |
Available for sale: |  |
Less than 12 months, Estimated Fair Value | 0 | 0
Less than 12 months, Gross Unrealized Losses | 0 | 0
Greater than 12 months, Estimated Fair Value | 43,802 | 42,425
Greater than 12 months, Gross Unrealized Losses | $ (2,198) | $ (3,575)

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