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SECURITIES - Held to Maturity Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Held to maturity: |  |
Less than 12 months, Estimated Fair Value | $ 0 | $ 8,286
Less than 12 months, Gross Unrealized losses | 0 | (26)
Greater than 12 months, Estimated Fair Value | 57,152 | 116,491
Greater than 12 months, Gross Unrealized losses | (1,061) | (3,802)
State and municipal obligations |  |
Held to maturity: |  |
Less than 12 months, Estimated Fair Value | 0 | 8,286
Less than 12 months, Gross Unrealized losses | 0 | (26)
Greater than 12 months, Estimated Fair Value | 405 | 22,142
Greater than 12 months, Gross Unrealized losses | (1) | (250)
U.S. GSE residential mortgage-backed securities |  |
Held to maturity: |  |
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 | 8,791 | 9,352
Greater than 12 months, Gross Unrealized losses | (109) | (336)
U.S. GSE residential collateralized mortgage obligations |  |
Held to maturity: |  |
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 | 24,594 | 40,665
Greater than 12 months, Gross Unrealized losses | (315) | (1,130)
U.S. GSE commercial mortgage-backed securities |  |
Held to maturity: |  |
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 | 5,216 | 16,205
Greater than 12 months, Gross Unrealized losses | (70) | (620)
U.S. GSE commercial collateralized mortgage obligations |  |
Held to maturity: |  |
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 | 18,146 | 28,127
Greater than 12 months, Gross Unrealized losses | $ (566) | $ (1,466)

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- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for 12 months or longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for less than 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 + Details
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity), in continuous unrealized loss position for less than 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 + Details
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