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INVESTMENT SECURITIES -Summarized Credit Ratings and Collateral Associated with Investment Portfolio (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Amortized Book $ 497,454 $ 491,492
Fair Value $ 479,599 $ 490,885
Credit Enhancement 5.00%  
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 $ 497,356  
Fair Value $ 479,502  
Credit Rating, AAA, Lowest of S&P, Moody's and Fitch | Total Collateral    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 20.00%  
Credit Rating, AA, Lowest of S&P, Moody's and Fitch | Total Collateral    
Debt Securities, Available-for-sale [Line Items]    
Credit rating, percentage 60.00%  
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 $ 12,112  
Fair Value $ 11,098  
Credit Enhancement 37.00%  
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 7.00%  
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 93.00%  
Student Loan ABS | Seasoned Student Loans    
Debt Securities, Available-for-sale [Line Items]    
Portfolio Mix 3.00%  
Amortized Book $ 13,450  
Fair Value $ 12,212  
Credit Enhancement 25.00%  
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 $ 184,009  
Fair Value $ 170,418  
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 $ 6,488  
Fair Value $ 6,563  
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 CMBS | Commercial Real Estate    
Debt Securities, Available-for-sale [Line Items]    
Portfolio Mix 15.00%  
Amortized Book $ 73,978  
Fair Value $ 66,134  
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 87.00%  
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 0.00%  
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 $ 17,161  
Fair Value $ 16,679  
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 $ 54,310  
Fair Value $ 58,332  
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 13.00%  
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 $ 51,263  
Fair Value $ 52,725  
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 $ 13,402  
Fair Value $ 13,020  
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 $ 70,684  
Fair Value $ 71,821  
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 $ 499  
Fair Value $ 499  
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%