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INVESTMENT SECURITIES -Summarized Credit Ratings and Collateral Associated with Investment Portfolio (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Amortized Book $ 403,090 $ 460,999
Fair Value $ 407,690 $ 466,465
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 $ 402,951  
Fair Value $ 407,551  
Credit Rating, AAA, Lowest of S&P, Moody's and Fitch | Total Collateral    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 7.00%  
Credit Rating, AA, Lowest of S&P, Moody's and Fitch | Total Collateral    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 72.00%  
Credit Rating, A, Lowest of S&P, Moody's and Fitch | Total Collateral    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 14.00%  
Credit Rating, BBB, Lowest of S&P, Moody's and Fitch | Total Collateral    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 0.00%  
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 1.00%  
Amortized Book $ 5,313  
Fair Value $ 5,382  
Credit Enhancement 50.00%  
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 0.00%  
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 100.00%  
Student Loan ABS | Seasoned Student Loans    
Debt Securities, Available-for-sale [Line Items]    
Portfolio Mix 3.00%  
Amortized Book $ 10,610  
Fair Value $ 10,516  
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 44.00%  
Amortized Book $ 178,213  
Fair Value $ 178,012  
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 73.00%  
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 23.00%  
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 $ 4,839  
Fair Value $ 4,917  
Credit Enhancement 5.00%  
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 RMBS | Reverse Mortgages    
Debt Securities, Available-for-sale [Line Items]    
Portfolio Mix 4.00%  
Amortized Book $ 16,030  
Fair Value $ 16,502  
Credit enhancement, percentage expected 37.00%  
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 19.00%  
Amortized Book $ 77,342  
Fair Value $ 81,116  
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 2.00%  
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 89.00%  
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 8.00%  
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 13.00%  
Amortized Book $ 50,872  
Fair Value $ 52,557  
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 $ 10,298  
Fair Value $ 10,277  
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 12.00%  
Amortized Book $ 49,185  
Fair Value $ 48,023  
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%