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

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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Amount of credit loss expense (reversal of expense) for financing receivable.

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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Allowance for credit losses:
Beginning balance	$ 3,496	$ 1,916	$ 2,240	$ 1,680
Impact of adopting ASC 326			137
Provision for loan losses	1,800	212	3,088	560
Charge-offs	(76)	(32)	(245)	(144)
Ending balance	5,220	2,096	5,220	2,096
Allowance related to Loans individually evaluated	1,273	803	1,273	803	$ 900
Allowance related to Loans collectively evaluated	3,947	1,293	3,947	1,293
Amortized cost related to Loans individually evaluated	270,772	99,905	270,772	99,905
Amortized cost related to Loans collectively evaluated	1,596,009	$ 1,585,843	1,596,009	$ 1,585,843
Commercial - Purchase
Allowance for credit losses:
Beginning balance	352		304
Impact of adopting ASC 326			19
Provision for loan losses	172		280
Charge-offs			(79)
Ending balance	524		524
Allowance related to Loans individually evaluated	181		181
Allowance related to Loans collectively evaluated	342		342
Amortized cost related to Loans individually evaluated	20,615		20,615
Amortized cost related to Loans collectively evaluated	282,759		282,759
Commercial - Refinance
Allowance for credit losses:
Beginning balance	1,594		1,016
Impact of adopting ASC 326			62
Provision for loan losses	1,093		1,609
Ending balance	2,687		2,687
Allowance related to Loans individually evaluated	592		592
Allowance related to Loans collectively evaluated	2,095		2,095
Amortized cost related to Loans individually evaluated	113,350		113,350
Amortized cost related to Loans collectively evaluated	598,046		598,046
Residential 1-4 Unit - Purchase
Allowance for credit losses:
Beginning balance	250		148
Impact of adopting ASC 326			9
Provision for loan losses	211		382
Charge-offs	(58)		(136)
Ending balance	403		403
Allowance related to Loans individually evaluated	96		96
Allowance related to Loans collectively evaluated	307		307
Amortized cost related to Loans individually evaluated	22,017		22,017
Amortized cost related to Loans collectively evaluated	223,561		223,561
Residential 1-4 Unit - Refinance
Allowance for credit losses:
Beginning balance	1,300		772
Impact of adopting ASC 326			47
Provision for loan losses	324		817
Charge-offs	(18)		(30)
Ending balance	1,606		1,606
Allowance related to Loans individually evaluated	404		404
Allowance related to Loans collectively evaluated	1,203		1,203
Amortized cost related to Loans individually evaluated	114,790		114,790
Amortized cost related to Loans collectively evaluated	$ 491,643		$ 491,643