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SECURITIES - Investment Securities Available for Sale in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Fair Value    
Less than 12 months $ 398,967 $ 88,270
12 months or longer 137,808 4,606
Total 536,775 92,876
Unrealized Losses    
Less than 12 months 5,550 368
12 months or longer 4,420 37
Total 9,970 405
U.S. treasury notes and bonds    
Fair Value    
Less than 12 months 49,084  
12 months or longer 0  
Total 49,084  
Unrealized Losses    
Less than 12 months 680  
12 months or longer 0  
Total 680  
Mortgage-backed securities, residential    
Fair Value    
Less than 12 months 293,720 70,037
12 months or longer 122,050 970
Total 415,770 71,007
Unrealized Losses    
Less than 12 months 4,502 200
12 months or longer 4,229 1
Total 8,731 201
Corporate bonds and notes    
Fair Value    
Less than 12 months 4,928 2,988
12 months or longer 1,989 0
Total 6,917 2,988
Unrealized Losses    
Less than 12 months 72 12
12 months or longer 10 0
Total 82 12
SBA loan pools    
Fair Value    
Less than 12 months 51,235 15,245
12 months or longer 13,769 3,636
Total 65,004 18,881
Unrealized Losses    
Less than 12 months 296 156
12 months or longer 181 36
Total $ 477 $ 192