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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		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	$ 69,342	$ 93,983	$ 93,692
Charge-offs	11	231	2,996	$ 484
Recoveries	33	117	168	353
Provision for (Recapture of) Credit Losses	(4,000)	0	(25,500)	23,500
Ending Balance	65,364	93,869	65,364	93,869
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	55,200	74,928	75,439
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for (Recapture of) Credit Losses	(2,888)	(473)	(23,127)	22,279
Ending Balance	52,312	74,455	52,312	74,455
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	1,825	2,290	1,934
Charge-offs	0	0	0	0
Recoveries	11	3	55	9
Provision for (Recapture of) Credit Losses	(775)	(355)	(928)	416
Ending Balance	1,061	1,938	1,061	1,938
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	2,546	3,651	2,992
Charge-offs	0	47	0	203
Recoveries	5	69	13	72
Provision for (Recapture of) Credit Losses	376	(169)	(78)	364
Ending Balance	2,927	3,504	2,927	3,504
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
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance	5,667	7,991	7,142
Charge-offs	10	161	2,985	172
Recoveries	6	2	10	7
Provision for (Recapture of) Credit Losses	(755)	761	741	2,320
Ending Balance	4,908	8,593	4,908	8,593
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	2,775	3,379	3,949
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for (Recapture of) Credit Losses	391	330	(783)	(1,360)
Ending Balance	3,166	3,709	3,166	3,709
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	67	302	74
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for (Recapture of) Credit Losses	18	(153)	11	(58)
Ending Balance	85	149	85	149
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	284	222	367
Charge-offs	0	0	0	0
Recoveries	0	0	79	206
Provision for (Recapture of) Credit Losses	(94)	15	(256)	(265)
Ending Balance	190	237	190	237
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	978	1,220	1,795
Charge-offs	1	23	11	109
Recoveries	11	43	11	59
Provision for (Recapture of) Credit Losses	(273)	44	(1,080)	(196)
Ending Balance	$ 715	$ 1,284	$ 715	1,284
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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