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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	Jun. 30, 2019 USD ($)
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	$ 14,506
Recorded Investment in Loans, Collectively Evaluated for Impairment	7,525,662
Allowance for Loan Losses, Individually Evaluated for Impairment	371
Allowance for Loan Losses, Collectively Evaluated for Impairment	66,761
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	2,088
Recorded Investment in Loans, Collectively Evaluated for Impairment	915,865
Allowance for Loan Losses, Individually Evaluated for Impairment	276
Allowance for Loan Losses, Collectively Evaluated for Impairment	7,581
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	5,632
Recorded Investment in Loans, Collectively Evaluated for Impairment	321,974
Allowance for Loan Losses, Individually Evaluated for Impairment	93
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,026
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	1,531
Recorded Investment in Loans, Collectively Evaluated for Impairment	5,415,820
Allowance for Loan Losses, Individually Evaluated for Impairment	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	48,287
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	116,457
Allowance for Loan Losses, Individually Evaluated for Impairment	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	871
SFR Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	4,858
Recorded Investment in Loans, Collectively Evaluated for Impairment	273,427
Allowance for Loan Losses, Individually Evaluated for Impairment	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	2,323
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	301,752
Allowance for Loan Losses, Individually Evaluated for Impairment	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	5,341
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	59,985
Allowance for Loan Losses, Individually Evaluated for Impairment	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	726
Consumer and Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	397
Recorded Investment in Loans, Collectively Evaluated for Impairment	120,382
Allowance for Loan Losses, Individually Evaluated for Impairment	2
Allowance for Loan Losses, Collectively Evaluated for Impairment	$ 606

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=118936363&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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=118936363&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=118936363&loc=SL6953423-111524

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