SECURITIES - Held to Maturity Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
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	102,029	116,491
Greater than 12 months, Gross Unrealized losses	(2,694)	(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	11,768	22,142
Greater than 12 months, Gross Unrealized losses	(35)	(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	9,075	9,352
Greater than 12 months, Gross Unrealized losses	(234)	(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	37,415	40,665
Greater than 12 months, Gross Unrealized losses	(746)	(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	16,251	16,205
Greater than 12 months, Gross Unrealized losses	(393)	(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	27,520	28,127
Greater than 12 months, Gross Unrealized losses	$ (1,286)	$ (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=82897076&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=82897076&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.

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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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