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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
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance $ 59,585 $ 61,540 $ 59,156
Charge-offs (291) (151) (238)
Recoveries 2,819 6,696 9,022
(Recapture of) provision for loan losses 1,500 (8,500) (6,400)
Ending Balance 63,613 59,585 61,540
PCI Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance 367 1,219 0
Charge-offs 0 0 0
Recoveries 0 0 0
(Recapture of) provision for loan losses (163) (852) 1,219
Ending Balance 204 367 1,219
Commercial and Industrial [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance 7,280 8,154 8,588
Charge-offs (10) (138) (120)
Recoveries 82 118 630
(Recapture of) provision for loan losses 168 (854) (944)
Ending Balance 7,520 7,280 8,154
Small Business Administration [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance 869 871 993
Charge-offs (257) 0 0
Recoveries 20 78 40
(Recapture of) provision for loan losses 430 (80) (162)
Ending Balance 1,062 869 871
Commercial Real Estate [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance 41,722 37,443 36,995
Charge-offs 0 0 0
Recoveries 0 154 792
(Recapture of) provision for loan losses 3,212 4,125 (344)
Ending Balance 44,934 41,722 37,443
Construction [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance 984 1,096 2,389
Charge-offs 0 0 0
Recoveries 2,506 6,036 7,174
(Recapture of) provision for loan losses (2,509) (6,148) (8,467)
Ending Balance 981 984 1,096
SFR Mortgage [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance 2,112 2,287 2,103
Charge-offs (13) 0 (102)
Recoveries 51 212 0
(Recapture of) provision for loan losses 46 (387) 286
Ending Balance 2,196 2,112 2,287
Dairy & Livestock and Agribusiness [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance 4,647 8,541 6,029
Charge-offs 0 0 0
Recoveries 19 19 216
(Recapture of) provision for loan losses 549 (3,913) 2,296
Ending Balance 5,215 4,647 8,541
Municipal Lease Finance Receivables [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance 851 941 1,153
Charge-offs 0 0 0
Recoveries 0 0 0
(Recapture of) provision for loan losses (76) (90) (212)
Ending Balance 775 851 941
Consumer and Other Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning Balance 753 988 906
Charge-offs (11) (13) (16)
Recoveries 141 79 170
(Recapture of) provision for loan losses (157) (301) (72)
Ending Balance $ 726 $ 753 $ 988