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Loans and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Balance and Activity Related to Allowance for Loan Losses for Held-for-Investment Loans by Type (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance $ 59,585 $ 61,540
Charge-offs (7) (2)
Recoveries 1,357 2,174
(Recapture of) provision for loan losses (1,000) (4,500)
Ending Balance 59,935 59,212
PCI Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 367 1,219
Charge-offs 0 0
Recoveries 0 0
(Recapture of) provision for loan losses (55) (494)
Ending Balance 312 725
Commercial and Industrial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 7,280 8,154
Charge-offs 0 0
Recoveries 10 52
(Recapture of) provision for loan losses 209 (250)
Ending Balance 7,499 7,956
Small Business Administration [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 869 871
Charge-offs 0 0
Recoveries 5 4
(Recapture of) provision for loan losses 10 (4)
Ending Balance 884 871
Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 41,722 37,443
Charge-offs 0 0
Recoveries 0 0
(Recapture of) provision for loan losses 141 1,543
Ending Balance 41,863 38,986
Construction [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 984 1,096
Charge-offs 0 0
Recoveries 1,334 2,025
(Recapture of) provision for loan losses (1,331) (2,301)
Ending Balance 987 820
SFR Mortgage [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 2,112 2,287
Charge-offs 0 0
Recoveries 0 64
(Recapture of) provision for loan losses 90 (165)
Ending Balance 2,202 2,186
Dairy & Livestock and Agribusiness [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 4,647 8,541
Charge-offs 0 0
Recoveries 0 0
(Recapture of) provision for loan losses 19 (2,699)
Ending Balance 4,666 5,842
Municipal Lease Finance Receivables [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 851 941
Charge-offs 0 0
Recoveries 0 0
(Recapture of) provision for loan losses (17) (52)
Ending Balance 834 889
Consumer and Other Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 753 988
Charge-offs (7) (2)
Recoveries 8 29
(Recapture of) provision for loan losses (66) (78)
Ending Balance $ 688 $ 937