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Loans and Lease Finance Receivables and Allowance for Credit Losses - Schedule of Recorded Investment in Loans Held-for-Investment and Related Allowance for Loan Losses by Loan Type (Detail) $ in Thousands	Dec. 31, 2019 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	$ 8,389
Recorded Investment in Loans, Collectively Evaluated for Impairment	7,559,930
Allowance for Loan Losses, Individually Evaluated for Impairment	508
Allowance for Loan Losses, Collectively Evaluated for Impairment	68,152
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	1,344
Recorded Investment in Loans, Collectively Evaluated for Impairment	933,783
Allowance for Loan Losses, Individually Evaluated for Impairment	251
Allowance for Loan Losses, Collectively Evaluated for Impairment	8,629
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	2,568
Recorded Investment in Loans, Collectively Evaluated for Impairment	302,440
Allowance for Loan Losses, Individually Evaluated for Impairment	257
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,196
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	1,121
Recorded Investment in Loans, Collectively Evaluated for Impairment	5,373,496
Allowance for Loan Losses, Individually Evaluated for Impairment	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	48,629
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	116,925
Allowance for Loan Losses, Individually Evaluated for Impairment	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	858
SFR Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	2,979
Recorded Investment in Loans, Collectively Evaluated for Impairment	280,489
Allowance for Loan Losses, Individually Evaluated for Impairment	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	2,339
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	383,709
Allowance for Loan Losses, Individually Evaluated for Impairment	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	5,255
Municipal Lease Finance Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	53,146
Allowance for Loan Losses, Individually Evaluated for Impairment	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	623
Consumer and Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	377
Recorded Investment in Loans, Collectively Evaluated for Impairment	115,942
Allowance for Loan Losses, Individually Evaluated for Impairment	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	$ 623

X

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524

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- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524

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+ References

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-Topic 310
-SubTopic 10
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-Paragraph 11B
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