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INVESTMENT SECURITIES -Summarized Credit Ratings and Collateral Associated with Investment Portfolio (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Amortized Book $ 488,433 $ 491,492
Fair Value $ 483,936 $ 490,885
Credit Enhancement 6.00%  
Guaranteed by U.S. Government, percentage 97.00%  
Guaranteed by U.S. Government Agencies, percentage 100.00%  
Total Collateral    
Debt Securities, Available-for-sale [Line Items]    
Portfolio Mix 100.00%  
Amortized Book $ 488,328  
Fair Value $ 483,831  
Credit Rating, AAA, Lowest of S&P, Moody's and Fitch | Total Collateral    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 19.00%  
Credit Rating, AA, Lowest of S&P, Moody's and Fitch | Total Collateral    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 61.00%  
Credit Rating, A, Lowest of S&P, Moody's and Fitch | Total Collateral    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 12.00%  
Credit Rating, BBB, Lowest of S&P, Moody's and Fitch | Total Collateral    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 1.00%  
Credit Rating, NR, Lowest of S&P, Moody's and Fitch | Total Collateral    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 7.00%  
Unsecured ABS | Unsecured Consumer Debt    
Debt Securities, Available-for-sale [Line Items]    
Portfolio Mix 2.00%  
Amortized Book $ 10,003  
Fair Value $ 9,694  
Credit Enhancement 41.00%  
Unsecured ABS | Credit Rating, AAA, Lowest of S&P, Moody's and Fitch | Unsecured Consumer Debt    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 6.00%  
Unsecured ABS | Credit Rating, AA, Lowest of S&P, Moody's and Fitch | Unsecured Consumer Debt    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Unsecured ABS | Credit Rating, A, Lowest of S&P, Moody's and Fitch | Unsecured Consumer Debt    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Unsecured ABS | Credit Rating, BBB, Lowest of S&P, Moody's and Fitch | Unsecured Consumer Debt    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Unsecured ABS | Credit Rating, NR, Lowest of S&P, Moody's and Fitch | Unsecured Consumer Debt    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 94.00%  
Student Loan ABS | Seasoned Student Loans    
Debt Securities, Available-for-sale [Line Items]    
Portfolio Mix 3.00%  
Amortized Book $ 12,624  
Fair Value $ 11,777  
Credit Enhancement 26.00%  
Student Loan ABS | Credit Rating, AAA, Lowest of S&P, Moody's and Fitch | Seasoned Student Loans    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Student Loan ABS | Credit Rating, AA, Lowest of S&P, Moody's and Fitch | Seasoned Student Loans    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Student Loan ABS | Credit Rating, A, Lowest of S&P, Moody's and Fitch | Seasoned Student Loans    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Student Loan ABS | Credit Rating, BBB, Lowest of S&P, Moody's and Fitch | Seasoned Student Loans    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Student Loan ABS | Credit Rating, NR, Lowest of S&P, Moody's and Fitch | Seasoned Student Loans    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 100.00%  
Federal Family Education Loan ABS | Federal Family Education Loan    
Debt Securities, Available-for-sale [Line Items]    
Portfolio Mix 37.00%  
Amortized Book $ 182,759  
Fair Value $ 172,613  
Credit Enhancement 6.00%  
Federal Family Education Loan ABS | Credit Rating, AAA, Lowest of S&P, Moody's and Fitch | Federal Family Education Loan    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 4.00%  
Federal Family Education Loan ABS | Credit Rating, AA, Lowest of S&P, Moody's and Fitch | Federal Family Education Loan    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 74.00%  
Federal Family Education Loan ABS | Credit Rating, A, Lowest of S&P, Moody's and Fitch | Federal Family Education Loan    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 22.00%  
Federal Family Education Loan ABS | Credit Rating, BBB, Lowest of S&P, Moody's and Fitch | Federal Family Education Loan    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Federal Family Education Loan ABS | Credit Rating, NR, Lowest of S&P, Moody's and Fitch | Federal Family Education Loan    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
PACE Loan ABS | Pace Loans    
Debt Securities, Available-for-sale [Line Items]    
Portfolio Mix 1.00%  
Amortized Book $ 6,149  
Fair Value $ 6,246  
Credit Enhancement 6.00%  
PACE Loan ABS | Credit Rating, AAA, Lowest of S&P, Moody's and Fitch | Pace Loans    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 100.00%  
PACE Loan ABS | Credit Rating, AA, Lowest of S&P, Moody's and Fitch | Pace Loans    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
PACE Loan ABS | Credit Rating, A, Lowest of S&P, Moody's and Fitch | Pace Loans    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
PACE Loan ABS | Credit Rating, BBB, Lowest of S&P, Moody's and Fitch | Pace Loans    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
PACE Loan ABS | Credit Rating, NR, Lowest of S&P, Moody's and Fitch | Pace Loans    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Non-Agency CMBS | Commercial Real Estate    
Debt Securities, Available-for-sale [Line Items]    
Portfolio Mix 15.00%  
Amortized Book $ 73,388  
Fair Value $ 69,735  
Credit Enhancement 55.00%  
Non-Agency CMBS | Credit Rating, AAA, Lowest of S&P, Moody's and Fitch | Commercial Real Estate    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 80.00%  
Non-Agency CMBS | Credit Rating, AA, Lowest of S&P, Moody's and Fitch | Commercial Real Estate    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 7.00%  
Non-Agency CMBS | Credit Rating, A, Lowest of S&P, Moody's and Fitch | Commercial Real Estate    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 3.00%  
Non-Agency CMBS | Credit Rating, BBB, Lowest of S&P, Moody's and Fitch | Commercial Real Estate    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 10.00%  
Non-Agency CMBS | Credit Rating, NR, Lowest of S&P, Moody's and Fitch | Commercial Real Estate    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Non-Agency RMBS | Reverse Mortgages    
Debt Securities, Available-for-sale [Line Items]    
Portfolio Mix 4.00%  
Amortized Book $ 17,213  
Fair Value $ 17,310  
Credit enhancement, percentage expected 33.00%  
Non-Agency RMBS | Credit Rating, AAA, Lowest of S&P, Moody's and Fitch | Reverse Mortgages    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 100.00%  
Non-Agency RMBS | Credit Rating, AA, Lowest of S&P, Moody's and Fitch | Reverse Mortgages    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Non-Agency RMBS | Credit Rating, A, Lowest of S&P, Moody's and Fitch | Reverse Mortgages    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Non-Agency RMBS | Credit Rating, BBB, Lowest of S&P, Moody's and Fitch | Reverse Mortgages    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Non-Agency RMBS | Credit Rating, NR, Lowest of S&P, Moody's and Fitch | Reverse Mortgages    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Municipal - General Obligation | Uncollateralized    
Debt Securities, Available-for-sale [Line Items]    
Portfolio Mix 11.00%  
Amortized Book $ 53,984  
Fair Value $ 58,963  
Municipal - General Obligation | Credit Rating, AAA, Lowest of S&P, Moody's and Fitch | Uncollateralized    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 3.00%  
Municipal - General Obligation | Credit Rating, AA, Lowest of S&P, Moody's and Fitch | Uncollateralized    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 84.00%  
Municipal - General Obligation | Credit Rating, A, Lowest of S&P, Moody's and Fitch | Uncollateralized    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 12.00%  
Municipal - General Obligation | Credit Rating, BBB, Lowest of S&P, Moody's and Fitch | Uncollateralized    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Municipal - General Obligation | Credit Rating, NR, Lowest of S&P, Moody's and Fitch | Uncollateralized    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Municipal - Revenue | Uncollateralized    
Debt Securities, Available-for-sale [Line Items]    
Portfolio Mix 10.00%  
Amortized Book $ 51,138  
Fair Value $ 54,132  
Municipal - Revenue | Credit Rating, AAA, Lowest of S&P, Moody's and Fitch | Uncollateralized    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Municipal - Revenue | Credit Rating, AA, Lowest of S&P, Moody's and Fitch | Uncollateralized    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 61.00%  
Municipal - Revenue | Credit Rating, A, Lowest of S&P, Moody's and Fitch | Uncollateralized    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 19.00%  
Municipal - Revenue | Credit Rating, BBB, Lowest of S&P, Moody's and Fitch | Uncollateralized    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Municipal - Revenue | Credit Rating, NR, Lowest of S&P, Moody's and Fitch | Uncollateralized    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 20.00%  
SBA ReRemic | SBA Guarantee    
Debt Securities, Available-for-sale [Line Items]    
Portfolio Mix 3.00%  
Amortized Book $ 12,647  
Fair Value $ 12,439  
SBA ReRemic | Credit Rating, AAA, Lowest of S&P, Moody's and Fitch | SBA Guarantee    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
SBA ReRemic | Credit Rating, AA, Lowest of S&P, Moody's and Fitch | SBA Guarantee    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 100.00%  
SBA ReRemic | Credit Rating, A, Lowest of S&P, Moody's and Fitch | SBA Guarantee    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
SBA ReRemic | Credit Rating, BBB, Lowest of S&P, Moody's and Fitch | SBA Guarantee    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
SBA ReRemic | Credit Rating, NR, Lowest of S&P, Moody's and Fitch | SBA Guarantee    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Agency MBS | Residential Mortgages    
Debt Securities, Available-for-sale [Line Items]    
Portfolio Mix 14.00%  
Amortized Book $ 68,174  
Fair Value $ 70,673  
Agency MBS | Credit Rating, AAA, Lowest of S&P, Moody's and Fitch | Residential Mortgages    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Agency MBS | Credit Rating, AA, Lowest of S&P, Moody's and Fitch | Residential Mortgages    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 100.00%  
Agency MBS | Credit Rating, A, Lowest of S&P, Moody's and Fitch | Residential Mortgages    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Agency MBS | Credit Rating, BBB, Lowest of S&P, Moody's and Fitch | Residential Mortgages    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Agency MBS | Credit Rating, NR, Lowest of S&P, Moody's and Fitch | Residential Mortgages    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Bank CDs | FDIC    
Debt Securities, Available-for-sale [Line Items]    
Portfolio Mix 0.00%  
Amortized Book $ 249  
Fair Value $ 249  
Bank CDs | Credit Rating, AAA, Lowest of S&P, Moody's and Fitch | FDIC    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Bank CDs | Credit Rating, AA, Lowest of S&P, Moody's and Fitch | FDIC    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Bank CDs | Credit Rating, A, Lowest of S&P, Moody's and Fitch | FDIC    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Bank CDs | Credit Rating, BBB, Lowest of S&P, Moody's and Fitch | FDIC    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
Bank CDs | Credit Rating, NR, Lowest of S&P, Moody's and Fitch | FDIC    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 100.00%