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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								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				$ 68,660				$ 63,613	$ 68,660	$ 63,613
Beginning Balance								63,613		63,613	$ 59,585
Charge-offs									(666)	(454)	(291)
Recoveries									358	501	2,819
Provision for loan losses	$ 0	$ 0	$ 11,500	12,000	$ 0	$ 1,500	$ 2,000	1,500	23,500	5,000	1,500
Ending Balance	93,692				68,660				93,692	68,660	63,613
Ending Balance											63,613
Previously Reported [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				68,660					68,660
Ending Balance					68,660					68,660
Impact of ASU 2016-13 Adoption [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				1,840					1,840
Ending Balance					1,840					1,840
PCI Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance								204		204	367
Charge-offs											0
Recoveries											0
Provision for loan losses											(163)
Ending Balance											204
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				48,629				45,097	48,629	45,097
Beginning Balance								44,934		44,934	41,722
Charge-offs									0	0	0
Recoveries									0	0	0
Provision for loan losses									23,263	3,532	3,212
Ending Balance	75,439				48,629				75,439	48,629	45,097
Ending Balance											44,934
Commercial Real Estate [Member] | Previously Reported [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				48,629					48,629
Ending Balance					48,629					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					3,547
Ending Balance					3,547					3,547
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				858				981	858	981
Beginning Balance								981		981	984
Charge-offs									0	0	0
Recoveries									11	12	2,506
Provision for loan losses									410	(135)	(2,509)
Ending Balance	1,934				858				1,934	858	981
Ending Balance											981
Construction [Member] | Previously Reported [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				858					858
Ending Balance					858					858
Construction [Member] | Impact of ASU 2016-13 Adoption [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				655					655
Ending Balance					655					655
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				1,453				1,078	1,453	1,078
Beginning Balance								1,062		1,062	869
Charge-offs									(362)	(321)	(257)
Recoveries									72	9	20
Provision for loan losses									11	687	430
Ending Balance	2,992				1,453				2,992	1,453	1,078
Ending Balance											1,062
Small Business Administration [Member] | Previously Reported [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				1,453					1,453
Ending Balance					1,453					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					1,818
Ending Balance					1,818					1,818
SBA - Paycheck Protection Program (PPP) [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Charge-offs									0
Recoveries									0
Provision for loan losses									0
Ending Balance	0								0
SBA - Paycheck Protection Program (PPP) [Member] | Previously Reported [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				0					0
Ending Balance					0					0
SBA - Paycheck Protection Program (PPP) [Member] | Impact of ASU 2016-13 Adoption [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				0					0
Ending Balance					0					0
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				8,880				7,528	8,880	7,528
Beginning Balance								7,520		7,520	7,280
Charge-offs									(195)	(48)	(10)
Recoveries									10	255	82
Provision for loan losses									889	1,145	168
Ending Balance	7,142				8,880				7,142	8,880	7,528
Ending Balance											7,520
Commercial and Industrial [Member] | Previously Reported [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				8,880					8,880
Ending Balance					8,880					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)					(2,442)
Ending Balance					(2,442)					(2,442)
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				5,255				5,225	5,255	5,225
Beginning Balance								5,215		5,215	4,647
Charge-offs									0	(78)	0
Recoveries									0	19	19
Provision for loan losses									(1,120)	89	549
Ending Balance	3,949				5,255				3,949	5,255	5,225
Ending Balance											5,215
Dairy & Livestock and Agribusiness [Member] | Previously Reported [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				5,255					5,255
Ending Balance					5,255					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)					(186)
Ending Balance					(186)					(186)
Municipal Lease Finance Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				623				775	623	775
Beginning Balance								775		775	851
Charge-offs									0	0	0
Recoveries									0	0	0
Provision for loan losses									(133)	(152)	(76)
Ending Balance	74				623				74	623	775
Ending Balance											775
Municipal Lease Finance Receivables [Member] | Previously Reported [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				623					623
Ending Balance					623					623
Municipal Lease Finance Receivables [Member] | Impact of ASU 2016-13 Adoption [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				(416)					(416)
Ending Balance					(416)					(416)
SFR Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				2,339				2,197	2,339	2,197
Beginning Balance								2,196		2,196	2,112
Charge-offs									0	0	(13)
Recoveries									206	196	51
Provision for loan losses									(135)	(54)	46
Ending Balance	367				2,339				367	2,339	2,197
Ending Balance											2,196
SFR Mortgage [Member] | Previously Reported [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				2,339					2,339
Ending Balance					2,339					2,339
SFR Mortgage [Member] | Impact of ASU 2016-13 Adoption [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				(2,043)					(2,043)
Ending Balance					(2,043)					(2,043)
Consumer and Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				623				732	623	732
Beginning Balance								$ 726		726	753
Charge-offs									(109)	(7)	(11)
Recoveries									59	10	141
Provision for loan losses									315	(112)	(157)
Ending Balance	$ 1,795				623				1,795	623	732
Ending Balance											$ 726
Consumer and Other Loans [Member] | Previously Reported [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				623					623
Ending Balance					623					623
Consumer and Other Loans [Member] | Impact of ASU 2016-13 Adoption [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Beginning Balance				$ 907					$ 907
Ending Balance					$ 907					$ 907

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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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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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