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SECURITIES - Securities by Remaining Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Within 1 year $ 331,233 $ 379,700
1-5 years 188,544 207,590
5-10 years 138 130
After 10 years 0 0
Total 519,895 587,400
Allowance for current expected credit losses (20) (20)
Equity securities 100 100
CMBS    
Debt Securities, Available-for-sale [Line Items]    
Within 1 year 304,060 346,272
1-5 years 181,131 195,061
5-10 years 0 0
After 10 years 0 0
Total 485,191 541,333
CMBS interest-only    
Debt Securities, Available-for-sale [Line Items]    
Within 1 year 2,365 937
1-5 years 7,172 9,506
5-10 years 0 0
After 10 years 0 0
Total 9,537 10,443
GNMA interest-only    
Debt Securities, Available-for-sale [Line Items]    
Within 1 year 36 40
1-5 years 210 111
5-10 years 138 130
After 10 years 0 0
Total 384 281
Agency securities    
Debt Securities, Available-for-sale [Line Items]    
Within 1 year 0 0
1-5 years 31 35
5-10 years 0 0
After 10 years 0 0
Total 31 35
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Within 1 year 24,772 32,451
1-5 years 0 2,877
5-10 years 0 0
After 10 years 0 0
Total $ 24,772 $ 35,328