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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
Jun. 30, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate, Non-owner occupied   $ 3,290,967
Total loans $ 8,402,534 7,568,319
Commercial And Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 840,738 935,127
Total loans 840,738  
SBA [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 300,156 305,008
Total loans 300,156  
Commercial real estate, owner occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   2,083,650
Total loans 2,074,465 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 286,526 283,468
Total loans 286,526  
Dairy & Livestock and Agribusiness [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 251,821 383,709
Total loans 251,821  
Municipal Lease Finance Receivables [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 49,876 53,146
Total loans 49,876 53,146
Consumer Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 85,332 116,319
Total loans 85,332  
Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate, Non-owner occupied   3,280,580
Total loans 8,166,670 7,321,402
Pass [Member] | Commercial And Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   895,234
Total loans 800,075  
Pass [Member] | SBA [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   283,430
Total loans 281,091  
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 282,908  
Pass [Member] | Dairy & Livestock and Agribusiness [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   320,670
Total loans 211,526  
Pass [Member] | Municipal Lease Finance Receivables [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   52,676
Total loans 49,429  
Pass [Member] | Consumer Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   114,870
Total loans 83,728  
Special Mention [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate, Non-owner occupied   10,005
Total loans 149,536 173,486
Special Mention [Member] | Commercial And Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   35,473
Total loans 19,928  
Special Mention [Member] | SBA [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   11,032
Total loans 9,613  
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 1,925  
Special Mention [Member] | Dairy & Livestock and Agribusiness [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   35,920
Total loans 18,851  
Special Mention [Member] | Municipal Lease Finance Receivables [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   470
Total loans 447  
Special Mention [Member] | Consumer Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   421
Total loans 872  
Substandard [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial real estate, Non-owner occupied   382
Total loans 86,328 73,431
Substandard [Member] | Commercial And Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   4,420
Total loans 20,735  
Substandard [Member] | SBA [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   10,546
Total loans 9,452  
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 1,693  
Substandard [Member] | Dairy & Livestock and Agribusiness [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross   27,119
Total loans 21,444  
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 732  
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
Total loans 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
Total loans 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