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Loans and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Recorded Investment in Loans Held-for-Investment and Related Allowance for Loan Losses by Loan Type (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment in Loans, Individually Evaluated for Impairment | $ 15,525 | $ 26,385
Recorded Investment in Loans, Collectively Evaluated for Impairment | 4,792,513 | 4,304,046
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality | 28,882 | 71,585
Allowance for Loan Losses, Individually Evaluated for Impairment | 75 | 141
Allowance for Loan Losses, Collectively Evaluated for Impairment | 59,143 | 60,180
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality | 367 | 1,219
PCI Loans [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
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality | 28,882 | 71,585
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0
Allowance for Loan Losses, Collectively Evaluated for Impairment | 0 | 0
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality | 367 | 1,219
Commercial and Industrial [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment in Loans, Individually Evaluated for Impairment | 440 | 901
Recorded Investment in Loans, Collectively Evaluated for Impairment | 512,885 | 484,177
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality | 0 | 0
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 114
Allowance for Loan Losses, Collectively Evaluated for Impairment | 7,280 | 8,040
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality | 0 | 0
Small Business Administration [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment in Loans, Individually Evaluated for Impairment | 1,531 | 3,582
Recorded Investment in Loans, Collectively Evaluated for Impairment | 120,524 | 93,602
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality | 0 | 0
Allowance for Loan Losses, Individually Evaluated for Impairment | 1 | 27
Allowance for Loan Losses, Collectively Evaluated for Impairment | 868 | 844
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality | 0 | 0
Commercial Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment in Loans, Individually Evaluated for Impairment | 8,133 | 15,128
Recorded Investment in Loans, Collectively Evaluated for Impairment | 3,368,580 | 2,915,013
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality | 0 | 0
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0
Allowance for Loan Losses, Collectively Evaluated for Impairment | 41,722 | 37,443
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality | 0 | 0
Construction [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 | 77,982 | 85,879
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality | 0 | 0
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0
Allowance for Loan Losses, Collectively Evaluated for Impairment | 984 | 1,096
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality | 0 | 0
SFR Mortgage [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment in Loans, Individually Evaluated for Impairment | 4,040 | 5,174
Recorded Investment in Loans, Collectively Evaluated for Impairment | 232,162 | 245,431
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality | 0 | 0
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0
Allowance for Loan Losses, Collectively Evaluated for Impairment | 2,112 | 2,287
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality | 0 | 0
Dairy & Livestock and Agribusiness [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment in Loans, Individually Evaluated for Impairment | 829 | 747
Recorded Investment in Loans, Collectively Evaluated for Impairment | 346,460 | 337,884
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality | 0 | 0
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0
Allowance for Loan Losses, Collectively Evaluated for Impairment | 4,647 | 8,541
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality | 0 | 0
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 | 70,243 | 64,639
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality | 0 | 0
Allowance for Loan Losses, Individually Evaluated for Impairment | 0 | 0
Allowance for Loan Losses, Collectively Evaluated for Impairment | 851 | 941
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality | 0 | 0
Consumer and Other Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Recorded Investment in Loans, Individually Evaluated for Impairment | 552 | 853
Recorded Investment in Loans, Collectively Evaluated for Impairment | 63,677 | 77,421
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality | 0 | 0
Allowance for Loan Losses, Individually Evaluated for Impairment | 74 | 0
Allowance for Loan Losses, Collectively Evaluated for Impairment | 679 | 988
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality | $ 0 | $ 0

X
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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