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Student Loans - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($) loan	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 807,937,000	$ 661,482,000	$ 807,937,000	$ 661,482,000		$ 655,411,000
Accrued Interest	8,246,000		8,246,000			8,164,000
Allowance for losses	9,144,000	8,708,000	9,144,000	8,708,000	$ 9,200,000	8,522,000	$ 8,862,000	$ 7,908,000
TDRs	2,762,000	4,571,000	2,762,000	4,571,000	$ 3,073,000	3,426,000	$ 5,155,000	$ 5,187,000
Accrued interest receivable, charged against interest income	(9,337,000)	(7,598,000)	(26,274,000)	(24,043,000)
Student loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	50,193,000		50,193,000			57,385,000
Accrued Interest	$ 5,487,000		$ 5,487,000			$ 4,974,000
Number of Loans | loan	1,163		1,163			1,297
Allowance for losses	$ 2,597,000		$ 2,597,000			$ 2,546,000
TDRs	0		0			0
Accrued interest receivable, charged against interest income	(54,000)	(9,000)	(97,000)	(59,000)
Charge-off of loans	530,000	$ 174,000	1,183,000	$ 1,121,000
Student loan | Special mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 318,000		$ 318,000			$ 513,000
Student loan | Repayment, Deferment, and Forbearance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans | loan	870		870			944
Student loan | School
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 6,551,000		$ 6,551,000			$ 12,905,000
Accrued Interest	$ 1,918,000		$ 1,918,000			$ 3,201,000
Number of Loans | loan	185		185			319
Student loan | Grace
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 5,076,000		$ 5,076,000			$ 988,000
Accrued Interest	$ 1,479,000		$ 1,479,000			$ 719,000
Number of Loans | loan	108		108			34
Student loan | Repayment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 20,782,000		$ 20,782,000			$ 28,906,000
Accrued Interest	$ 549,000		$ 549,000			$ 292,000
Number of Loans | loan	459		459			623
Student loan | Deferment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 9,285,000		$ 9,285,000			$ 7,407,000
Accrued Interest	$ 1,025,000		$ 1,025,000			$ 209,000
Number of Loans | loan	232		232			187
Student loan | Forbearance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 8,499,000		$ 8,499,000			$ 7,179,000
Accrued Interest	$ 516,000		$ 516,000			$ 553,000
Number of Loans | loan	179		179			134

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