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SECURITIES - Investment Securities Available for Sale in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair Value
Less than 12 months	$ 365,276	$ 88,270
12 months or longer	11,470	4,606
Total	376,746	92,876
Unrealized Losses
Less than 12 months	9,342	368
12 months or longer	96	37
Total	9,438	405
Mortgage-backed securities, residential
Fair Value
Less than 12 months	339,140	70,037
12 months or longer	0	970
Total	339,140	71,007
Unrealized Losses
Less than 12 months	9,175	200
12 months or longer	0	1
Total	9,175	201
Corporate bonds and notes
Fair Value
Less than 12 months	2,964	2,988
12 months or longer	0	0
Total	2,964	2,988
Unrealized Losses
Less than 12 months	36	12
12 months or longer	0	0
Total	36	12
SBA loan pools
Fair Value
Less than 12 months	23,172	15,245
12 months or longer	11,470	3,636
Total	34,642	18,881
Unrealized Losses
Less than 12 months	131	156
12 months or longer	96	36
Total	$ 227	$ 192

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