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SECURITIES - Amortized cost and Fair values of securities with maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Amortized Cost
Amortized Cost	$ 851,299	$ 899,700
Fair Value
Fair Value	856,835	922,869
Amortized Cost
Debt securities held-to-maturity Amortized Cost	192,994	68,395
Fair Value
Fair Value	195,608	72,441
Mortgage-backed: Agency residential
Amortized Cost
Amortized Cost	164,942	198,543
Fair Value
Fair Value	169,104	203,252
Amortized Cost
Debt securities held-to-maturity Amortized Cost	20,335	13,031
Fair Value
Fair Value	20,723	13,483
Mortgage-backed: Agency commercial
Amortized Cost
Amortized Cost	208,692	246,649
Fair Value
Fair Value	207,997	250,766
Amortized Cost
Debt securities held-to-maturity Amortized Cost	144,269	32,880
Fair Value
Fair Value	145,307	$ 35,084
Available-for-sale
Amortized Cost
Due in 1 year or less	31,406
Due after 1 year through 5 years	76,138
Due after 5 years through 10 years	242,096
Due after 10 years	128,025
Amortized Cost	851,299
Fair Value
Due in 1 year or less	31,734
Due after 1 year through 5 years	78,807
Due after 5 years through 10 years	242,487
Due after 10 years	126,706
Fair Value	856,835
Available-for-sale | Mortgage-backed: Agency residential
Amortized Cost
Amortized Cost	164,942
Fair Value
Fair Value	169,104
Available-for-sale | Mortgage-backed: Agency commercial
Amortized Cost
Amortized Cost	208,692
Fair Value
Fair Value	207,997
Held-to-maturity
Amortized Cost
Due in 1 year or less	2,772
Due after 1 year through 5 years	12,000
Due after 5 years through 10 years	13,227
Due after 10 years	391
Debt securities held-to-maturity Amortized Cost	192,994
Fair Value
Due in 1 year or less	2,817
Due after 1 year through 5 years	12,770
Due after 5 years through 10 years	13,580
Due after 10 years	411
Fair Value	195,608
Held-to-maturity | Mortgage-backed: Agency residential
Amortized Cost
Debt securities held-to-maturity Amortized Cost	20,335
Fair Value
Fair Value	20,723
Held-to-maturity | Mortgage-backed: Agency commercial
Amortized Cost
Debt securities held-to-maturity Amortized Cost	144,269
Fair Value
Fair Value	$ 145,307

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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)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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