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Student Loans - Credit Quality Indicators (Details) $ in Thousands	Sep. 30, 2021 USD ($) loan	Dec. 31, 2020 USD ($) loan	Sep. 30, 2020 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Total Loans	$ 807,937	$ 655,411	$ 661,482
Accrued Interest	$ 8,246	$ 8,164
Student loan
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans | loan	1,163	1,297
Total Loans	$ 50,193	$ 57,385
Accrued Interest	$ 5,487	$ 4,974
Student loan | School
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans | loan	185	319
Total Loans	$ 6,551	$ 12,905
Accrued Interest	$ 1,918	$ 3,201
Student loan | Grace
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans | loan	108	34
Total Loans	$ 5,076	$ 988
Accrued Interest	$ 1,479	$ 719
Student loan | Repayment
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans | loan	459	623
Total Loans	$ 20,782	$ 28,906
Accrued Interest	$ 549	$ 292
Student loan | Deferment
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans | loan	232	187
Total Loans	$ 9,285	$ 7,407
Accrued Interest	$ 1,025	$ 209
Student loan | Forbearance
Financing Receivable, Credit Quality Indicator [Line Items]
Number of Loans | loan	179	134
Total Loans	$ 8,499	$ 7,179
Accrued Interest	$ 516	$ 553

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