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SECURITIES - Available for Sale Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Amortized Cost, Available for sale:
Within one year	$ 54,145
One to five years	41,972
Five to ten years	59,075
Beyond ten years	373,590
Total	528,782	$ 639,463
Estimated Fair Value, Available for sale:
Within one year	54,168
One to five years	42,698
Five to ten years	58,277
Beyond ten years	382,603
Estimated Fair Value	537,746	638,291
U.S. Treasury securities
Amortized Cost, Available for sale:
Total	49,999	50,833
Estimated Fair Value, Available for sale:
Estimated Fair Value	49,999	50,822
U.S. GSE securities
Amortized Cost, Available for sale:
Total		5,000
Estimated Fair Value, Available for sale:
Estimated Fair Value		4,995
State and municipal obligations
Amortized Cost, Available for sale:
Total	36,009	34,303
Estimated Fair Value, Available for sale:
Estimated Fair Value	37,479	34,964
U.S. GSE residential mortgage-backed securities
Amortized Cost, Available for sale:
Total	75,298	84,550
Estimated Fair Value, Available for sale:
Estimated Fair Value	77,777	84,691
U.S. GSE residential collateralized mortgage obligations
Amortized Cost, Available for sale:
Total	179,542	278,149
Estimated Fair Value, Available for sale:
Estimated Fair Value	182,551	277,851
U.S. GSE commercial mortgage-backed securities
Amortized Cost, Available for sale:
Total	16,611	13,656
Estimated Fair Value, Available for sale:
Estimated Fair Value	16,916	13,609
U.S. GSE commercial collateralized mortgage obligations
Amortized Cost, Available for sale:
Total	98,073	102,722
Estimated Fair Value, Available for sale:
Estimated Fair Value	102,201	104,156
Other asset backed securities
Amortized Cost, Available for sale:
Total	24,250	24,250
Estimated Fair Value, Available for sale:
Estimated Fair Value	23,875	23,401
Corporate bonds
Amortized Cost, Available for sale:
Total	49,000	46,000
Estimated Fair Value, Available for sale:
Estimated Fair Value	$ 46,948	$ 43,802

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454

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