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Loans and Lease Finance Receivables and Allowance for Credit Losses - Summary of Loan, Including PCI Loans by Internal Risk Ratings (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate, Non-owner occupied   $ 3,290,967
Total loans $ 8,348,808 7,568,319
Commercial And Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 812,062 935,127
SBA [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 303,896 305,008
Total loans 303,896  
Commercial real estate, owner occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   2,083,650
Total loans 2,143,259 2,083,650
Construction, Speculative [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   106,895
Construction, Non-speculative [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   10,030
SFR mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 270,511 283,468
Total loans 270,511  
Dairy & Livestock and Agribusiness [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 361,146 383,709
Municipal Lease Finance Receivables [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 45,547 53,146
Total loans 45,547 53,146
Consumer Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 86,006 116,319
Total loans 86,006  
Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate, Non-owner occupied   3,280,580
Total loans 8,046,192 7,321,402
Pass [Member] | Commercial And Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   895,234
Pass [Member] | SBA [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   283,430
Total loans 279,708  
Pass [Member] | Commercial real estate, owner occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   1,977,007
Pass [Member] | Construction, Speculative [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   106,895
Pass [Member] | Construction, Non-speculative [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   10,030
Pass [Member] | SFR mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   280,010
Total loans 266,441  
Pass [Member] | Dairy & Livestock and Agribusiness [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   320,670
Pass [Member] | Municipal Lease Finance Receivables [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   52,676
Total loans 45,135  
Pass [Member] | Consumer Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   114,870
Total loans 84,483  
Special Mention [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate, Non-owner occupied   10,005
Total loans 223,797 173,486
Special Mention [Member] | Commercial And Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   35,473
Special Mention [Member] | SBA [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   11,032
Total loans 12,430  
Special Mention [Member] | Commercial real estate, owner occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   78,208
Special Mention [Member] | Construction, Speculative [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   0
Special Mention [Member] | Construction, Non-speculative [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   0
Special Mention [Member] | SFR mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   1,957
Total loans 452  
Special Mention [Member] | Dairy & Livestock and Agribusiness [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   35,920
Special Mention [Member] | Municipal Lease Finance Receivables [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   470
Total loans 412  
Special Mention [Member] | Consumer Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   421
Total loans 630  
Substandard [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate, Non-owner occupied   382
Total loans 78,819 73,431
Substandard [Member] | Commercial And Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   4,420
Substandard [Member] | SBA [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   10,546
Total loans 11,758  
Substandard [Member] | Commercial real estate, owner occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   28,435
Substandard [Member] | Construction, Speculative [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   0
Substandard [Member] | Construction, Non-speculative [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   0
Substandard [Member] | SFR mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   1,501
Total loans 3,618  
Substandard [Member] | Dairy & Livestock and Agribusiness [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   27,119
Substandard [Member] | Municipal Lease Finance Receivables [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   0
Total loans 0  
Substandard [Member] | Consumer Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   1,028
Total loans 893  
Doubtful & Loss [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate, Non-owner occupied   0
Total loans 0 0
Doubtful & Loss [Member] | Commercial And Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   0
Doubtful & Loss [Member] | SBA [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   0
Total loans 0  
Doubtful & Loss [Member] | Commercial real estate, owner occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   0
Doubtful & Loss [Member] | Construction, Speculative [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   0
Doubtful & Loss [Member] | Construction, Non-speculative [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   0
Doubtful & Loss [Member] | SFR mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   0
Total loans 0  
Doubtful & Loss [Member] | Dairy & Livestock and Agribusiness [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   0
Doubtful & Loss [Member] | Municipal Lease Finance Receivables [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   0
Total loans 0  
Doubtful & Loss [Member] | Consumer Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   $ 0
Total loans $ 0