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Loans and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Recorded Investment in Loans Held-for-Investment, Excluding PCI Loans, and Related Allowance for Loan Losses by Portfolio Segment (Detail) - Loans, Excluding PCI Loans [Member] - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	$ 55,465	$ 68,377
Recorded Investment in Loans, Collectively Evaluated for Impairment	4,043,842	3,541,679
Allowance for Loan Losses, Individually Evaluated for Impairment	694	794
Allowance for Loan Losses, Collectively Evaluated for Impairment	58,642	59,915
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	1,477	1,611
Recorded Investment in Loans, Collectively Evaluated for Impairment	465,484	401,989
Allowance for Loan Losses, Individually Evaluated for Impairment	575	592
Allowance for Loan Losses, Collectively Evaluated for Impairment	8,156	6,910
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	3,304	3,158
Recorded Investment in Loans, Collectively Evaluated for Impairment	110,399	123,227
Allowance for Loan Losses, Individually Evaluated for Impairment	55	42
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,181	2,154
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	35,577	41,886
Recorded Investment in Loans, Collectively Evaluated for Impairment	2,783,542	2,457,297
Allowance for Loan Losses, Individually Evaluated for Impairment	0	154
Allowance for Loan Losses, Collectively Evaluated for Impairment	38,286	34,694
Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	7,651	7,651
Recorded Investment in Loans, Collectively Evaluated for Impairment	81,997	47,695
Allowance for Loan Losses, Individually Evaluated for Impairment	48	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,103	1,043
SFR Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	5,874	5,913
Recorded Investment in Loans, Collectively Evaluated for Impairment	227,091	199,219
Allowance for Loan Losses, Individually Evaluated for Impairment	16	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	2,186	2,425
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	714	7,277
Recorded Investment in Loans, Collectively Evaluated for Impairment	226,996	166,164
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	5,176	3,746
Municipal Lease Finance Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	73,098	76,220
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,165	1,030
Consumer and Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	868	881
Recorded Investment in Loans, Collectively Evaluated for Impairment	75,235	69,868
Allowance for Loan Losses, Individually Evaluated for Impairment	0	6
Allowance for Loan Losses, Collectively Evaluated for Impairment	1,389	819
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment in Loans, Individually Evaluated for Impairment	0	0
Recorded Investment in Loans, Collectively Evaluated for Impairment	0	0
Allowance for Loan Losses, Individually Evaluated for Impairment	0	0
Allowance for Loan Losses, Collectively Evaluated for Impairment	$ 0	$ 7,094

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=49124121&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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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+ References

No definition available.

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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- Definition

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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=49124121&loc=SL6953423-111524

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