Loans and Allowance for Loan Losses - Investment Loans Allowance Activity (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Allowance for loan losses
Beginning Balance	$ 7,441	$ 8,320
Cumulative-effect adjustment upon adoption of ASU 2016-13	11,125
Provision for (recoveries of) loan losses	39,804	518
Charge-offs and sales	(468)	(329)
Recoveries	66	(232)
Ending Balance	57,968	8,277
Originated SBC loans
Allowance for loan losses
Beginning Balance	304	11
Cumulative-effect adjustment upon adoption of ASU 2016-13	2,400
Provision for (recoveries of) loan losses	7,658	(11)
Ending Balance	10,362
Originated Transitional loans
Allowance for loan losses
Beginning Balance	188	353
Cumulative-effect adjustment upon adoption of ASU 2016-13	1,906
Provision for (recoveries of) loan losses	22,170	(131)
Ending Balance	24,264	222
Acquired loans
Allowance for loan losses
Beginning Balance	3,054	5,052
Cumulative-effect adjustment upon adoption of ASU 2016-13	1,878
Provision for (recoveries of) loan losses	5,722	235
Charge-offs and sales	(8)
Recoveries		(246)
Ending Balance	10,646	5,041
Acquired SBA 7(a) loans
Allowance for loan losses
Beginning Balance	2,114	2,318
Cumulative-effect adjustment upon adoption of ASU 2016-13	3,562
Provision for (recoveries of) loan losses	12	271
Charge-offs and sales	(131)	(329)
Recoveries	65	14
Ending Balance	5,622	2,274
Originated SBA 7(a) loans
Allowance for loan losses
Beginning Balance	1,781	586
Cumulative-effect adjustment upon adoption of ASU 2016-13	1,379
Provision for (recoveries of) loan losses	4,242	154
Charge-offs and sales	(329)
Recoveries	1
Ending Balance	$ 7,074	$ 740

Amount of addition (reduction) in allowance reserve for credit loss from cumulative effect of adoption of new ASU.

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Amount of other addition (reduction) in allowance reserve for credit loss.

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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 loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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Amount of expense related to estimated loss from loan and lease transactions.

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