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SECURITIES - Amortized cost and Fair values of securities with maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Amortized Cost
Amortized Cost	$ 899,700	$ 584,507
Fair Value
Fair Value	922,869	592,404
Amortized Cost
Debt securities held-to-maturity	68,395	88,477
Fair Value
Fair Value	72,441	90,529
Mortgage-backed: Agency residential
Amortized Cost
Amortized Cost	198,543	198,184
Fair Value
Fair Value	203,252	200,678
Amortized Cost
Debt securities held-to-maturity	13,031	19,072
Fair Value
Fair Value	13,483	19,063
Mortgage-backed: Agency commercial
Amortized Cost
Amortized Cost	246,649	133,730
Fair Value
Fair Value	250,766	134,954
Amortized Cost
Debt securities held-to-maturity	32,880	24,166
Fair Value
Fair Value	35,084	$ 24,887
Available-for-sale
Amortized Cost
Due in 1 year or less	28,332
Due after 1 year through 5 years	82,778
Due after 5 years through 10 years	210,971
Due after 10 years	132,427
Amortized Cost	899,700
Fair Value
Due in 1 year or less	28,626
Due after 1 year through 5 years	85,859
Due after 5 years through 10 years	218,710
Due after 10 years	135,656
Fair Value	922,869
Available-for-sale | Mortgage-backed: Agency residential
Amortized Cost
Amortized Cost	198,543
Fair Value
Fair Value	203,252
Available-for-sale | Mortgage-backed: Agency commercial
Amortized Cost
Amortized Cost	246,649
Fair Value
Fair Value	250,766
Held-to-maturity
Amortized Cost
Due in 1 year or less	1,396
Due after 1 year through 5 years	13,895
Due after 5 years through 10 years	6,302
Due after 10 years	891
Debt securities held-to-maturity	68,395
Fair Value
Due in 1 year or less	1,424
Due after 1 year through 5 years	14,806
Due after 5 years through 10 years	6,723
Due after 10 years	921
Fair Value	72,441
Held-to-maturity | Mortgage-backed: Agency residential
Amortized Cost
Debt securities held-to-maturity	13,031
Fair Value
Fair Value	13,483
Held-to-maturity | Mortgage-backed: Agency commercial
Amortized Cost
Debt securities held-to-maturity	32,880
Fair Value
Fair Value	$ 35,084

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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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