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SECURITIES - Amortized cost and Fair values of securities with maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Amortized Cost
Amortized Cost	$ 887,562	$ 899,700
Fair Value
Fair Value	896,218	922,869
Amortized Cost
Debt securities held-to-maturity	318,730	68,395
Fair Value
Fair Value	321,156	72,441
Mortgage-backed: Agency residential
Amortized Cost
Amortized Cost	172,372	198,543
Fair Value
Fair Value	175,112	203,252
Amortized Cost
Debt securities held-to-maturity	22,065	13,031
Fair Value
Fair Value	22,418	13,483
Mortgage-backed: Agency commercial
Amortized Cost
Amortized Cost	164,999	246,649
Fair Value
Fair Value	165,901	250,766
Amortized Cost
Debt securities held-to-maturity	265,657	32,880
Fair Value
Fair Value	266,620	$ 35,084
Available-for-sale
Amortized Cost
Due in 1 year or less	37,707
Due after 1 year through 5 years	74,925
Due after 5 years through 10 years	309,565
Due after 10 years	127,994
Amortized Cost	887,562
Fair Value
Due in 1 year or less	38,206
Due after 1 year through 5 years	77,508
Due after 5 years through 10 years	311,729
Due after 10 years	127,762
Fair Value	896,218
Available-for-sale | Mortgage-backed: Agency residential
Amortized Cost
Amortized Cost	172,372
Fair Value
Fair Value	175,112
Available-for-sale | Mortgage-backed: Agency commercial
Amortized Cost
Amortized Cost	164,999
Fair Value
Fair Value	165,901
Held-to-maturity
Amortized Cost
Due in 1 year or less	3,055
Due after 1 year through 5 years	17,110
Due after 5 years through 10 years	10,452
Due after 10 years	391
Debt securities held-to-maturity	318,730
Fair Value
Due in 1 year or less	3,072
Due after 1 year through 5 years	17,797
Due after 5 years through 10 years	10,844
Due after 10 years	405
Fair Value	321,156
Held-to-maturity | Mortgage-backed: Agency residential
Amortized Cost
Debt securities held-to-maturity	22,065
Fair Value
Fair Value	22,418
Held-to-maturity | Mortgage-backed: Agency commercial
Amortized Cost
Debt securities held-to-maturity	265,657
Fair Value
Fair Value	$ 266,620

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- Definition

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+ References

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-Publisher FASB
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