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Mortgage Servicing Rights - Narrative (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Transfers and Servicing [Abstract]
Moving average of weekly prepayment data (in months)	3 months
Anticipated loan prepayment rate of servicing assets (in hundredths)	15.24%
Servicing assets and servicing liabilities at fair value, assumptions used to estimate fair value, discount rate adjustment factor (in hundredths)	9.00%
Mortgage servicing rights capitalized	$ 328,000	$ 129,000
Amortization of mortgage servicing rights	151,000	66,000
Fair value of mortgage servicing rights	2,608,000	2,126,000	$ 1,985,000
Outstanding principal balance of loans serviced for others	335,938,000	268,077,000	318,459,000
Mortgage servicing rights impairment	$ 92,000	$ 0	$ 358,000

X

- Definition

The moving average period of weekly prepayment data used as assumption in evaluating the carrying value of mortgage servicing rights.

+ References

No definition available.

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- Definition

Dollar amount of principal outstanding on loans being serviced for others at the balance sheet date.

+ References

No definition available.

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X

- Definition

The amount of rate spread added to the ten-year US Treasury rate to derive the discount rate used in the fair value calculation for the loan servicing portfolio.

+ References

No definition available.

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- Definition

The periodic amortization (in proportion to and over the period of estimated net servicing income or loss) of capitalized servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

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- Definition

Amount of other-than-temporary impairment (OTTI) applied to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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- Definition

The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

+ References

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- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

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- Definition

Estimated rate of prepayments of principal on servicing assets and servicing liabilities.

+ References

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