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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 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Beginning Balance       $ 59,156       $ 59,825 $ 59,156 $ 59,825 $ 75,235
Charge-offs                 (238) (1,009) (2,369)
Recoveries                 9,022 5,940 3,059
(Recapture of) Provision for Loan Losses $ 4,400 $ 2,000 $ 0 0 $ 1,100 $ 2,500 $ 2,000 0 (6,400) (5,600) (16,100)
Ending Balance 61,540       59,156       61,540 59,156 59,825
PCI Loans [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Beginning Balance       0         0    
Charge-offs                 0    
Recoveries                 0    
(Recapture of) Provision for Loan Losses                 1,219    
Ending Balance 1,219       0       1,219 0  
Commercial and Industrial [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Beginning Balance       8,588       7,074 8,588 7,074 8,502
Charge-offs                 (120) (411) (888)
Recoveries                 630 319 873
(Recapture of) Provision for Loan Losses                 (944) 1,606 (1,413)
Ending Balance 8,154       8,588       8,154 8,588 7,074
Small Business Administration [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Beginning Balance       993       2,557 993 2,557 2,332
Charge-offs                 0 (37) (50)
Recoveries                 40 41 114
(Recapture of) Provision for Loan Losses                 (162) (1,568) 161
Ending Balance 871       993       871 993 2,557
Commercial Real Estate [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Beginning Balance       36,995       33,373 36,995 33,373 39,402
Charge-offs                 0 (117) (353)
Recoveries                 792 4,330 140
(Recapture of) Provision for Loan Losses                 (344) (591) (5,816)
Ending Balance 37,443       36,995       37,443 36,995 33,373
Construction [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Beginning Balance       2,389       988 2,389 988 1,305
Charge-offs                 0 0 0
Recoveries                 7,174 581 885
(Recapture of) Provision for Loan Losses                 (8,467) 820 (1,202)
Ending Balance 1,096       2,389       1,096 2,389 988
SFR Mortgage [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Beginning Balance       2,103       2,344 2,103 2,344 2,718
Charge-offs                 (102) (215) 0
Recoveries                 0 186 401
(Recapture of) Provision for Loan Losses                 286 (212) (775)
Ending Balance 2,287       2,103       2,287 2,103 2,344
Dairy & Livestock and Agribusiness [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Beginning Balance       6,029       5,479 6,029 5,479 11,728
Charge-offs                 0 0 (1,061)
Recoveries                 216 407 492
(Recapture of) Provision for Loan Losses                 2,296 143 (5,680)
Ending Balance 8,541       6,029       8,541 6,029 5,479
Municipal Lease Finance Receivables [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Beginning Balance       1,153       1,412 1,153 1,412 2,335
Charge-offs                 0 0 0
Recoveries                 0 0 0
(Recapture of) Provision for Loan Losses                 (212) (259) (923)
Ending Balance 941       1,153       941 1,153 1,412
Consumer and Other Loans [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Beginning Balance       906       1,262 906 1,262 960
Charge-offs                 (16) (229) (17)
Recoveries                 170 76 154
(Recapture of) Provision for Loan Losses                 (72) (203) 165
Ending Balance $ 988       906       988 906 1,262
Unallocated [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Beginning Balance       $ 0       $ 5,336 $ 0 5,336 5,953
Charge-offs                   0 0
Recoveries                   0 0
(Recapture of) Provision for Loan Losses                   (5,336) (617)
Ending Balance         $ 0         $ 0 $ 5,336