Loans and Allowance for Loan Losses - Investment Loans Allowance Activity (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Allowance for loan losses
Beginning Balance	$ 8,814	$ 9,666	$ 8,320	$ 11,746
Provision for (Recoveries of) loan losses	693	800	2,559	571
Charge-offs and sales	(1,127)	(817)	(2,090)	(1,792)
Recoveries	(415)	(762)	(824)	(1,638)
Ending Balance	7,965	8,887	7,965	8,887
Originated SBC loans
Allowance for loan losses
Beginning Balance	421	95	11	637
Provision for (Recoveries of) loan losses	33	(94)	443	(467)
Charge-offs and sales	(127)		(127)	(169)
Ending Balance	327	1	327	1
Originated Transitional loans
Allowance for loan losses
Beginning Balance	367	226	353
Provision for (Recoveries of) loan losses	(79)	101	(65)	327
Charge-offs and sales	2		2
Ending Balance	290	327	290	327
Acquired loans
Allowance for loan losses
Beginning Balance	5,072	6,167	5,052	7,264
Provision for (Recoveries of) loan losses	180	890	675	1,120
Charge-offs and sales	(783)	(766)	(784)	(1,050)
Recoveries	(537)	(829)	(1,011)	(1,872)
Ending Balance	3,932	5,462	3,932	5,462
Acquired SBA 7(a) loans
Allowance for loan losses
Beginning Balance	2,194	2,634	2,318	3,527
Provision for (Recoveries of) loan losses	(183)	(70)	590	(608)
Charge-offs and sales	(93)	(51)	(1,055)	(573)
Recoveries, adjustments	122	67	187	234
Ending Balance	2,040	2,580	2,040	2,580
Originated SBA 7(a) loans
Allowance for loan losses
Beginning Balance	694	544	586	318
Provision for (Recoveries of) loan losses	746	(27)	854	199
Charge-offs and sales	(126)		(126)
Ending Balance	1,314	$ 517	1,314	$ 517
Acquired Transitional loans
Allowance for loan losses
Beginning Balance	66
Provision for (Recoveries of) loan losses	(4)		62
Ending Balance	$ 62		$ 62

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

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

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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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