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SECURITIES - Amortized cost and Fair values of securities with maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Amortized Cost
Amortized Cost	$ 821,935	$ 899,700
Fair Value
Fair Value	836,267	922,869
Amortized Cost
Debt securities held-to-maturity	309,132	68,395
Fair Value
Fair Value	314,924	72,441
Mortgage-backed: Agency residential
Amortized Cost
Amortized Cost	143,657	198,543
Fair Value
Fair Value	147,147	203,252
Amortized Cost
Debt securities held-to-maturity	24,063	13,031
Fair Value
Fair Value	24,567	13,483
Mortgage-backed: Agency commercial
Amortized Cost
Amortized Cost	131,172	246,649
Fair Value
Fair Value	133,440	250,766
Amortized Cost
Debt securities held-to-maturity	258,563	32,880
Fair Value
Fair Value	262,582	$ 35,084
Available-for-sale
Amortized Cost
Due in 1 year or less	30,667
Due after 1 year through 5 years	86,096
Due after 5 years through 10 years	303,175
Due after 10 years	127,168
Amortized Cost	821,935
Fair Value
Due in 1 year or less	30,905
Due after 1 year through 5 years	89,035
Due after 5 years through 10 years	307,785
Due after 10 years	127,955
Fair Value	836,267
Available-for-sale | Mortgage-backed: Agency residential
Amortized Cost
Amortized Cost	143,657
Fair Value
Fair Value	147,147
Available-for-sale | Mortgage-backed: Agency commercial
Amortized Cost
Amortized Cost	131,172
Fair Value
Fair Value	133,440
Held-to-maturity
Amortized Cost
Due in 1 year or less	3,049
Due after 1 year through 5 years	12,129
Due after 5 years through 10 years	10,937
Due after 10 years	391
Debt securities held-to-maturity	309,132
Fair Value
Due in 1 year or less	3,082
Due after 1 year through 5 years	12,901
Due after 5 years through 10 years	11,384
Due after 10 years	408
Fair Value	314,924
Held-to-maturity | Mortgage-backed: Agency residential
Amortized Cost
Debt securities held-to-maturity	24,063
Fair Value
Fair Value	24,567
Held-to-maturity | Mortgage-backed: Agency commercial
Amortized Cost
Debt securities held-to-maturity	258,563
Fair Value
Fair Value	$ 262,582

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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
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