SECURITIES - Amortized cost and Fair values of securities with maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Amortized Cost
Amortized Cost	$ 972,817	$ 938,360
Fair Value
Fair Value	933,922	942,168
Amortized Cost
Debt securities held-to-maturity	438,054	336,185
Fair Value
Fair Value	416,603	336,027
Mortgage-backed: Agency residential
Amortized Cost
Amortized Cost	244,721	178,236
Fair Value
Fair Value	237,528	179,466
Amortized Cost
Debt securities held-to-maturity	27,100	20,555
Fair Value
Fair Value	26,160	20,649
Mortgage-backed: Agency commercial
Amortized Cost
Amortized Cost	156,806	164,875
Fair Value
Fair Value	149,311	164,061
Amortized Cost
Debt securities held-to-maturity	313,296	287,615
Fair Value
Fair Value	293,157	$ 286,563
Available-for-sale
Amortized Cost
Due in 1 year or less	26,200
Due after 1 year through 5 years	191,896
Due after 5 years through 10 years	268,930
Due after 10 years	84,264
Amortized Cost	972,817
Fair Value
Due in 1 year or less	26,286
Due after 1 year through 5 years	187,331
Due after 5 years through 10 years	253,700
Due after 10 years	79,766
Fair Value	933,922
Available-for-sale | Mortgage-backed: Agency residential
Amortized Cost
Amortized Cost	244,721
Fair Value
Fair Value	237,528
Available-for-sale | Mortgage-backed: Agency commercial
Amortized Cost
Amortized Cost	156,806
Fair Value
Fair Value	149,311
Held-to-maturity
Amortized Cost
Due in 1 year or less	2,136
Due after 1 year through 5 years	14,726
Due after 5 years through 10 years	54,808
Due after 10 years	25,988
Debt securities held-to-maturity	438,054
Fair Value
Due in 1 year or less	2,161
Due after 1 year through 5 years	14,663
Due after 5 years through 10 years	54,474
Due after 10 years	25,988
Fair Value	416,603
Held-to-maturity | Mortgage-backed: Agency residential
Amortized Cost
Debt securities held-to-maturity	27,100
Fair Value
Fair Value	26,160
Held-to-maturity | Mortgage-backed: Agency commercial
Amortized Cost
Debt securities held-to-maturity	313,296
Fair Value
Fair Value	$ 293,157