Loans and Allowance for Loan Losses - Investment Loans Allowance Activity (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for loan losses
Beginning Balance	$ 7,441	$ 8,320
Provision for (recoveries of) loan losses	33,785	3,684	$ 1,701
Charge-offs and sales	(5,795)	(3,069)
Recoveries	176	(1,494)
Ending Balance	46,732	7,441	8,320
Cumulative Effect, Period of Adoption, Adjustment
Allowance for loan losses
Beginning Balance	11,125
Ending Balance		11,125
Originated SBC loans
Allowance for loan losses
Beginning Balance	304	11
Provision for (recoveries of) loan losses	6,335	420
Charge-offs and sales	(199)	(127)
Ending Balance	8,840	304	11
Originated SBC loans \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for loan losses
Beginning Balance	2,400
Ending Balance		2,400
Originated Transitional loans
Allowance for loan losses
Beginning Balance	188	353
Provision for (recoveries of) loan losses	16,247	(167)
Charge-offs and sales	(3,346)
Recoveries		2
Ending Balance	14,995	188	353
Originated Transitional loans \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for loan losses
Beginning Balance	1,906
Ending Balance		1,906
Acquired loans
Allowance for loan losses
Beginning Balance	3,054	5,052
Provision for (recoveries of) loan losses	3,502	781
Charge-offs and sales	(137)	(1,144)
Recoveries		(1,635)
Ending Balance	8,297	3,054	5,052
Acquired loans \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for loan losses
Beginning Balance	1,878
Ending Balance		1,878
Acquired SBA 7(a) loans
Allowance for loan losses
Beginning Balance	2,114	2,318
Provision for (recoveries of) loan losses	141	939
Charge-offs and sales	(1,396)	(1,282)
Recoveries	128	139
Ending Balance	4,549	2,114	2,318
Acquired SBA 7(a) loans \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for loan losses
Beginning Balance	3,562
Ending Balance		3,562
Originated SBA 7(a) loans
Allowance for loan losses
Beginning Balance	1,781	586
Provision for (recoveries of) loan losses	7,560	1,711
Charge-offs and sales	(717)	(516)
Recoveries	48
Ending Balance	10,051	1,781	$ 586
Originated SBA 7(a) loans \| Cumulative Effect, Period of Adoption, Adjustment
Allowance for loan losses
Beginning Balance	1,379
Ending Balance		1,379
Unfunded Loan Commitment
Allowance for loan losses
Beginning Balance	0
Ending Balance	$ 900	$ 0

Amount of other addition (reduction) in 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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