Loans Held for Investment and Loans Held for Investment at Fair Value - Activity in Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Allowance for credit losses:
Beginning balance	$ 4,663	$ 5,881	$ 4,262	$ 5,845
Provision for loan losses	279	(1,000)	1,009	(895)
Charge-offs	(37)	(918)	(366)	(987)
Ending balance	4,905	3,963	4,905	3,963
Allowance for Loans Individually Evaluated	1,164	1,949	1,164	1,949	$ 1,406
Allowance related to Loans collectively evaluated	3,741	2,014	3,741	2,014
Amortized cost related to Loans individually evaluated	255,202	318,974	255,202	318,974
Amortized cost related to Loans collectively evaluated	2,868,502	1,768,742	2,868,502	1,768,742
Commercial - Purchase
Allowance for credit losses:
Beginning balance	518	328	385	373
Provision for loan losses	94	48	374	3
Charge-offs		(114)	(147)	(114)
Ending balance	612	262	612	262
Allowance for Loans Individually Evaluated	6	57	6	57	9
Allowance related to Loans collectively evaluated	606	205	606	205
Amortized cost related to Loans individually evaluated	14,911	19,314	14,911	19,314
Amortized cost related to Loans collectively evaluated	662,580	347,423	662,580	347,423
Commercial - Refinance
Allowance for credit losses:
Beginning balance	2,140	1,990	2,144	2,093
Provision for loan losses	(125)	28	(123)	(76)
Charge-offs	(19)	(95)	(25)	(94)
Ending balance	1,996	1,923	1,996	1,923
Allowance for Loans Individually Evaluated	434	1,005	434	1,005	826
Allowance related to Loans collectively evaluated	1,562	918	1,562	918
Amortized cost related to Loans individually evaluated	80,442	92,397	80,442	92,397
Amortized cost related to Loans collectively evaluated	832,332	598,567	832,332	598,567
Residential 1-4 Unit - Purchase
Allowance for credit losses:
Beginning balance	389	322	400	333
Provision for loan losses	51	(41)	40	(15)
Charge-offs				(37)
Ending balance	440	281	440	281
Allowance for Loans Individually Evaluated	52	120	52	120	96
Allowance related to Loans collectively evaluated	388	161	388	161
Amortized cost related to Loans individually evaluated	22,885	21,084	22,885	21,084
Amortized cost related to Loans collectively evaluated	506,911	255,812	506,911	255,812
Residential 1-4 Unit - Refinance
Allowance for credit losses:
Beginning balance	1,029	1,227	948	1,216
Provision for loan losses	241	(229)	427	(218)
Charge-offs		(151)	(105)	(151)
Ending balance	1,270	847	1,270	847
Allowance for Loans Individually Evaluated	196	342	196	342	138
Allowance related to Loans collectively evaluated	1,074	507	1,074	507
Amortized cost related to Loans individually evaluated	96,649	112,294	96,649	112,294
Amortized cost related to Loans collectively evaluated	791,071	496,249	791,071	496,249
Short Term 1-4 Unit - Purchase
Allowance for credit losses:
Beginning balance	50	386	43	595
Provision for loan losses	(16)	(313)	(9)	(508)
Charge-offs				(14)
Ending balance	34	73	34	73
Allowance for Loans Individually Evaluated		56		56	31
Allowance related to Loans collectively evaluated	34	16	34	16
Amortized cost related to Loans individually evaluated	2,302	23,883	2,302	23,883
Amortized cost related to Loans collectively evaluated	55,671	16,322	55,671	16,322
Short Term 1-4 Unit - Refinance
Allowance for credit losses:
Beginning balance	537	1,628	342	1,235
Provision for loan losses	34	(493)	300	(81)
Charge-offs	(18)	(558)	(89)	(577)
Ending balance	553	577	553	577
Allowance for Loans Individually Evaluated	476	369	476	369	$ 306
Allowance related to Loans collectively evaluated	77	207	77	207
Amortized cost related to Loans individually evaluated	38,013	50,002	38,013	50,002
Amortized cost related to Loans collectively evaluated	$ 19,937	$ 54,369	$ 19,937	$ 54,369

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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