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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

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- 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 + Details
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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 + Details
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