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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, 2017
Mar. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance $ 61,540 $ 59,156
Charge-offs (2) (163)
Recoveries 2,174 343
(Recapture of) provision for loan losses (4,500) 0
Ending Balance 59,212 59,336
PCI Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 1,219 0
Charge-offs 0 0
Recoveries 0 0
(Recapture of) provision for loan losses (494) 0
Ending Balance 725 0
Commercial and Industrial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 8,154 8,588
Charge-offs 0 (61)
Recoveries 52 63
(Recapture of) provision for loan losses (250) 141
Ending Balance 7,956 8,731
Small Business Administration [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 871 993
Charge-offs 0 0
Recoveries 4 1
(Recapture of) provision for loan losses (4) 242
Ending Balance 871 1,236
Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 37,443 36,995
Charge-offs 0 0
Recoveries 0 139
(Recapture of) provision for loan losses 1,543 1,152
Ending Balance 38,986 38,286
Construction [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 1,096 2,389
Charge-offs 0 0
Recoveries 2,025 9
(Recapture of) provision for loan losses (2,301) (1,247)
Ending Balance 820 1,151
SFR Mortgage [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 2,287 2,103
Charge-offs 0 (102)
Recoveries 64 0
(Recapture of) provision for loan losses (165) 201
Ending Balance 2,186 2,202
Dairy & Livestock and Agribusiness [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 8,541 6,029
Charge-offs 0 0
Recoveries 0 99
(Recapture of) provision for loan losses (2,699) (952)
Ending Balance 5,842 5,176
Municipal Lease Finance Receivables [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 941 1,153
Charge-offs 0 0
Recoveries 0 0
(Recapture of) provision for loan losses (52) 12
Ending Balance 889 1,165
Consumer and Other Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Beginning Balance 988 906
Charge-offs (2) 0
Recoveries 29 32
(Recapture of) provision for loan losses (78) 451
Ending Balance $ 937 $ 1,389