Loans Held for Investment and Loans Held for Investment at Fair Value - Schedule of Activity in Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Allowance for credit losses:
Beginning balance	$ 4,626	$ 4,905	$ 4,893	$ 4,262
Provision for loan losses	154	580	1,088	1,589
Recoveries (charge-offs)	(95)	(155)	(1,296)	(521)
Ending balance	4,685	5,330	4,685	5,330
Allowance for Loans Individually Evaluated	854	874	854	874	$ 1,096
Allowance related to Loans collectively evaluated	3,831	4,456	3,831	4,456
Amortized cost related to Loans individually evaluated	347,300	256,257	347,300	256,257
Amortized cost related to Loans collectively evaluated	2,603,225	3,194,636	2,603,225	3,194,636
Commercial - Purchase
Allowance for credit losses:
Beginning balance	732	612	639	385
Provision for loan losses	228	78	321	452
Recoveries (charge-offs)				(147)
Ending balance	960	690	960	690
Allowance for Loans Individually Evaluated	137	6	137	6	28
Allowance related to Loans collectively evaluated	823	684	823	684
Amortized cost related to Loans individually evaluated	24,013	19,033	24,013	19,033
Amortized cost related to Loans collectively evaluated	623,111	703,835	623,111	703,835
Commercial - Refinance
Allowance for credit losses:
Beginning balance	2,026	1,996	2,031	2,144
Provision for loan losses	(312)	66	(238)	(57)
Recoveries (charge-offs)			(79)	(25)
Ending balance	1,714	2,062	1,714	2,062
Allowance for Loans Individually Evaluated	415	369	415	369	517
Allowance related to Loans collectively evaluated	1,299	1,693	1,299	1,693
Amortized cost related to Loans individually evaluated	93,080	81,204	93,080	81,204
Amortized cost related to Loans collectively evaluated	734,957	852,282	734,957	852,282
Residential 1-4 Unit - Purchase
Allowance for credit losses:
Beginning balance	403	440	542	400
Provision for loan losses	217	182	104	222
Recoveries (charge-offs)	(59)	(7)	(85)	(7)
Ending balance	561	615	561	615
Allowance for Loans Individually Evaluated		118		118	118
Allowance related to Loans collectively evaluated	561	497	561	497
Amortized cost related to Loans individually evaluated	40,235	21,731	40,235	21,731
Amortized cost related to Loans collectively evaluated	491,798	608,338	491,798	608,338
Residential 1-4 Unit - Refinance
Allowance for credit losses:
Beginning balance	1,264	1,270	1,272	948
Provision for loan losses	(1)	227	2	654
Recoveries (charge-offs)			(11)	(105)
Ending balance	1,263	1,497	1,263	1,497
Allowance for Loans Individually Evaluated	171	176	171	176	175
Allowance related to Loans collectively evaluated	1,092	1,321	1,092	1,321
Amortized cost related to Loans individually evaluated	138,951	91,368	138,951	91,368
Amortized cost related to Loans collectively evaluated	706,689	922,258	706,689	922,258
Short Term 1-4 Unit - Purchase
Allowance for credit losses:
Beginning balance	59	34	21	43
Provision for loan losses	(407)	9	410
Recoveries (charge-offs)	393		(386)
Ending balance	45	43	45	43
Allowance for Loans Individually Evaluated	23		23
Allowance related to Loans collectively evaluated	22	43	22	43
Amortized cost related to Loans individually evaluated	7,804	7,076	7,804	7,076
Amortized cost related to Loans collectively evaluated	36,812	65,929	36,812	65,929
Short Term 1-4 Unit - Refinance
Allowance for credit losses:
Beginning balance	142	553	388	342
Provision for loan losses	429	18	489	318
Recoveries (charge-offs)	(429)	(148)	(735)	(237)
Ending balance	142	423	142	423
Allowance for Loans Individually Evaluated	108	205	108	205	$ 258
Allowance related to Loans collectively evaluated	34	218	34	218
Amortized cost related to Loans individually evaluated	43,217	35,845	43,217	35,845
Amortized cost related to Loans collectively evaluated	$ 9,858	$ 41,994	$ 9,858	$ 41,994

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

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