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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Beginning Balance       $ 63,613       $ 59,585 $ 63,613 $ 59,585 $ 61,540
Charge-offs                 (454) (291) (151)
Recoveries                 501 2,819 6,696
Provision for loan losses $ 0 $ 1,500 $ 2,000 1,500 $ 3,000 $ 500 $ (1,000) (1,000) 5,000 1,500 (8,500)
Ending Balance 68,660       63,613       68,660 63,613 59,585
Beginning Balance         63,613         63,613  
PCI Loans [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Beginning Balance       204       367 204 367 1,219
Charge-offs                   0 0
Recoveries                   0 0
Provision for loan losses                   (163) (852)
Ending Balance         204         204 367
Commercial and Industrial [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Beginning Balance       7,520       7,280 7,520 7,280 8,154
Charge-offs                 (48) (10) (138)
Recoveries                 255 82 118
Provision for loan losses                 1,145 168 (854)
Ending Balance 8,880       7,520       8,880 7,520 7,280
Beginning Balance         7,528         7,528  
Small Business Administration [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Beginning Balance       1,062       869 1,062 869 871
Charge-offs                 (321) (257) 0
Recoveries                 9 20 78
Provision for loan losses                 687 430 (80)
Ending Balance 1,453       1,062       1,453 1,062 869
Beginning Balance         1,078         1,078  
Commercial Real Estate [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Beginning Balance       44,934       41,722 44,934 41,722 37,443
Charge-offs                 0 0 0
Recoveries                 0 0 154
Provision for loan losses                 3,532 3,212 4,125
Ending Balance 48,629       44,934       48,629 44,934 41,722
Beginning Balance         45,097         45,097  
Construction [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Beginning Balance       981       984 981 984 1,096
Charge-offs                 0 0 0
Recoveries                 12 2,506 6,036
Provision for loan losses                 (135) (2,509) (6,148)
Ending Balance 858       981       858 981 984
Beginning Balance         981         981  
SFR Mortgage [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Beginning Balance       2,196       2,112 2,196 2,112 2,287
Charge-offs                 0 (13) 0
Recoveries                 196 51 212
Provision for loan losses                 (54) 46 (387)
Ending Balance 2,339       2,196       2,339 2,196 2,112
Beginning Balance         2,197         2,197  
Dairy & Livestock and Agribusiness [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Beginning Balance       5,215       4,647 5,215 4,647 8,541
Charge-offs                 (78) 0 0
Recoveries                   19 19
Provision for loan losses                 89 549 (3,913)
Ending Balance 5,255       5,215       5,255 5,215 4,647
Beginning Balance         5,225         5,225  
Municipal Lease Finance Receivables [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Beginning Balance       775       851 775 851 941
Charge-offs                 0 0 0
Recoveries                 0 0 0
Provision for loan losses                 (152) (76) (90)
Ending Balance 623       775       623 775 851
Beginning Balance         775         775  
Consumer and Other Loans [Member]                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Beginning Balance       $ 726       $ 753 726 753 988
Charge-offs                 (7) (11) (13)
Recoveries                   141 79
Provision for loan losses                 (112) (157) (301)
Ending Balance $ 623       726       $ 623 726 $ 753
Beginning Balance         $ 732         $ 732