SECURITIES - Held to Maturity Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Held to maturity:
Less than 12 months, Estimated Fair Value	$ 19,788	$ 8,286
Less than 12 months, Gross Unrealized losses	(74)	(26)
Greater than 12 months, Estimated Fair Value	22,707	116,491
Greater than 12 months, Gross Unrealized losses	(268)	(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	0	22,142
Greater than 12 months, Gross Unrealized losses	0	(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	7,268	9,352
Greater than 12 months, Gross Unrealized losses	(54)	(336)
U.S. GSE residential collateralized mortgage obligations
Held to maturity:
Less than 12 months, Estimated Fair Value	6,750	0
Less than 12 months, Gross Unrealized losses	(17)	0
Greater than 12 months, Estimated Fair Value	6,105	40,665
Greater than 12 months, Gross Unrealized losses	(45)	(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	5,034	16,205
Greater than 12 months, Gross Unrealized losses	(82)	(620)
U.S. GSE commercial collateralized mortgage obligations
Held to maturity:
Less than 12 months, Estimated Fair Value	13,038	0
Less than 12 months, Gross Unrealized losses	(57)	0
Greater than 12 months, Estimated Fair Value	4,300	28,127
Greater than 12 months, Gross Unrealized losses	$ (87)	$ (1,466)

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.

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

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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

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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.

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Fair value of investment in debt security measured at amortized cost (held-to-maturity), in continuous unrealized loss position for 12 months or longer.

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