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Loans and Lease Finance Receivables and Allowance for Credit Losses - Schedule of Balance and Activity Related to Allowance for Loan Losses for Held-for-Investment Loans by Type (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	$ 93,692
Charge-offs	(2,475)	$ (86)
Recoveries	88	227
Provision for (Recapture of) loan losses	(19,500)	12,000
Ending Balance	71,805	82,641
Previously Reported [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		68,660
Impact of ASU 2016-13 Adoption [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		1,840
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	75,439
Charge-offs	0	0
Recoveries	0
Provision for (Recapture of) loan losses	(18,867)	6,251
Ending Balance	56,572	58,427
Commercial Real Estate [Member] | Previously Reported [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		48,629
Commercial Real Estate [Member] | Impact of ASU 2016-13 Adoption [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		3,547
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	1,934
Charge-offs	0	0
Recoveries	3	3
Provision for (Recapture of) loan losses	(59)	3,116
Ending Balance	1,878	4,632
Construction [Member] | Previously Reported [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		858
Construction [Member] | Impact of ASU 2016-13 Adoption [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		655
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	2,992
Charge-offs	0	0
Recoveries	4
Provision for (Recapture of) loan losses	(484)	675
Ending Balance	2,512	3,946
Small Business Administration [Member] | Previously Reported [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		1,453
Small Business Administration [Member] | Impact of ASU 2016-13 Adoption [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		1,818
SBA - Paycheck Protection Program (PPP) [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	0
Charge-offs	0
Recoveries	0
Provision for (Recapture of) loan losses	0
Ending Balance	0
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	7,142
Charge-offs	(2,475)	0
Recoveries	2	2
Provision for (Recapture of) loan losses	1,770	2,947
Ending Balance	6,439	9,387
Commercial and Industrial [Member] | Previously Reported [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		8,880
Commercial and Industrial [Member] | Impact of ASU 2016-13 Adoption [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		(2,442)
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	3,949
Charge-offs	0	0
Recoveries	0
Provision for (Recapture of) loan losses	(1,227)	(803)
Ending Balance	2,722	4,266
Dairy & Livestock and Agribusiness [Member] | Previously Reported [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		5,255
Dairy & Livestock and Agribusiness [Member] | Impact of ASU 2016-13 Adoption [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		(186)
Municipal Lease Finance Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	74
Charge-offs	0	0
Recoveries	0
Provision for (Recapture of) loan losses	(39)	70
Ending Balance	35	277
Municipal Lease Finance Receivables [Member] | Previously Reported [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		623
Municipal Lease Finance Receivables [Member] | Impact of ASU 2016-13 Adoption [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		(416)
SFR Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	367
Charge-offs	0	0
Recoveries	79	206
Provision for (Recapture of) loan losses	(148)	(221)
Ending Balance	298	281
SFR Mortgage [Member] | Previously Reported [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		2,339
SFR Mortgage [Member] | Impact of ASU 2016-13 Adoption [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		(2,043)
Consumer and Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	1,795
Charge-offs	0	(86)
Recoveries	0	16
Provision for (Recapture of) loan losses	(446)	(35)
Ending Balance	$ 1,349	1,425
Consumer and Other Loans [Member] | Previously Reported [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		623
Consumer and Other Loans [Member] | Impact of ASU 2016-13 Adoption [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance		$ 907

X

- Definition

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

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