Loans and Allowance for Credit Losses - Investment Loans Allowance Activity (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Allowance for loan losses
Beginning Balance	$ 51,244	$ 45,649	$ 45,377	$ 46,732
Provision for (recoveries of) loan losses	(4,728)	5,534	(3,487)	6,097
Purchased financial assets with credit deterioration	5,000		5,000
Charge-offs and sales	(333)	(1,356)	(506)	(3,014)
Recoveries	(58)	(198)	(259)	(186)
Ending Balance	46,125	49,629	46,125	49,629
Bridge
Allowance for loan losses
Beginning Balance	19,878	17,057	19,519	14,588
Provision for (recoveries of) loan losses	(1,485)	4,121	(1,126)	6,590
Ending Balance	18,393	21,178	18,393	21,178
Construction
Allowance for loan losses
Beginning Balance	5,323
Provision for (recoveries of) loan losses	(201)		122
Purchased financial assets with credit deterioration	5,000		5,000
Ending Balance	5,122		5,122
Fixed rate
Allowance for loan losses
Beginning Balance	6,524	6,753	6,861	7,629
Provision for (recoveries of) loan losses	(302)	612	(639)	736
Charge-offs and sales		(311)		(1,311)
Recoveries		(189)		(189)
Ending Balance	6,222	6,865	6,222	6,865
Residential
Allowance for loan losses
Beginning Balance	60	60	60	52
Provision for (recoveries of) loan losses	(3)	1	(3)	9
Ending Balance	57	61	57	61
SBA 7(a)
Allowance for loan losses
Beginning Balance	13,233	13,599	12,180	14,600
Provision for (recoveries of) loan losses	219	794	1,491	439
Charge-offs and sales	(326)	(1,045)	(499)	(1,703)
Recoveries		2	(46)	14
Ending Balance	13,126	13,350	13,126	13,350
Other
Allowance for loan losses
Beginning Balance	6,226	8,180	6,757	9,863
Provision for (recoveries of) loan losses	(2,956)	6	(3,332)	(1,677)
Charge-offs and sales	(7)		(7)
Recoveries	(58)	(11)	(213)	(11)
Ending Balance	3,205	8,175	3,205	8,175
Unfunded Loan Commitment
Allowance for loan losses
Ending Balance	$ 900	$ 400	$ 900	$ 400

The amount of allowances on purchased credit deteriorated loans.

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- Definition

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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