SECURITIES - Available for Sale Securities in a Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Available for sale:
Less than 12 months, Estimated Fair Value	$ 114,404	$ 99,812
Less than 12 months, Gross Unrealized Losses	(498)	(779)
Greater than 12 months, Estimated Fair Value	412,561	424,638
Greater than 12 months, Gross Unrealized Losses	(12,422)	(16,685)
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	39,475	29,050
Greater than 12 months, Gross Unrealized Losses	(496)	(947)
State and municipal obligations
Available for sale:
Less than 12 months, Estimated Fair Value	0	6,655
Less than 12 months, Gross Unrealized Losses	0	(15)
Greater than 12 months, Estimated Fair Value	10,061	21,273
Greater than 12 months, Gross Unrealized Losses	(72)	(339)
U.S. GSE residential mortgage-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	87,040	88,762
Greater than 12 months, Gross Unrealized Losses	(1,858)	(3,036)
U.S. GSE residential collateralized mortgage obligations
Available for sale:
Less than 12 months, Estimated Fair Value	67,391	46,452
Less than 12 months, Gross Unrealized Losses	(248)	(141)
Greater than 12 months, Estimated Fair Value	166,790	172,468
Greater than 12 months, Gross Unrealized Losses	(3,870)	(5,813)
U.S. GSE commercial mortgage-backed securities
Available for sale:
Less than 12 months, Estimated Fair Value		0
Less than 12 months, Gross Unrealized Losses		0
Greater than 12 months, Estimated Fair Value		3,508
Greater than 12 months, Gross Unrealized Losses		(28)
U.S. GSE commercial collateralized mortgage obligations
Available for sale:
Less than 12 months, Estimated Fair Value	47,013	46,705
Less than 12 months, Gross Unrealized Losses	(250)	(623)
Greater than 12 months, Estimated Fair Value	43,390	43,933
Greater than 12 months, Gross Unrealized Losses	(1,681)	(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	23,098	23,219
Greater than 12 months, Gross Unrealized Losses	(1,152)	(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	42,707	42,425
Greater than 12 months, Gross Unrealized Losses	$ (3,293)	$ (3,575)

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- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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

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- Definition

Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer.

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