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SECURITIES - Investment Securities Available for Sale in Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Fair Value    
Less than 12 months $ 450,318 $ 88,270
12 months or longer 13,385 4,606
Total 463,703 92,876
Unrealized Losses    
Less than 12 months 8,173 368
12 months or longer 225 37
Total 8,398 405
U.S. Treasury notes and bonds    
Fair Value    
Less than 12 months 24,819  
12 months or longer 0  
Total 24,819  
Unrealized Losses    
Less than 12 months 162  
12 months or longer 0  
Total 162  
Mortgage-backed securities, residential    
Fair Value    
Less than 12 months 383,380 70,037
12 months or longer 4,146 970
Total 387,526 71,007
Unrealized Losses    
Less than 12 months 7,707 200
12 months or longer 119 1
Total 7,826 201
Corporate bonds and notes    
Fair Value    
Less than 12 months 2,979 2,988
12 months or longer 2,966 0
Total 5,945 2,988
Unrealized Losses    
Less than 12 months 21 12
12 months or longer 34 0
Total 55 12
SBA loan pools    
Fair Value    
Less than 12 months 39,140 15,245
12 months or longer 6,273 3,636
Total 45,413 18,881
Unrealized Losses    
Less than 12 months 283 156
12 months or longer 72 36
Total $ 355 $ 192