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Loans and Lease Finance Receivables and Allowance for Credit Losses - Summary of Components of Loans and Lease Finance Receivables, Including PCI Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Construction $ 62,264 $ 85,145    
Total loans 7,887,713 8,348,808    
Loans and lease finance receivables 7,887,713 8,348,808    
Less: Allowance for credit losses (65,019) (93,692) $ (68,660) $ (63,613)
Total loans and lease finance receivables 7,822,694 8,255,116    
Commercial And Industrial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 813,063 812,062    
SBA [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 288,600 303,896    
Total loans 288,600 303,896    
Commercial real estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 5,789,730 5,501,509    
SFR mortgage [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 240,654 270,511    
Total loans 240,654 270,511    
Dairy And Livestock And Agribusiness [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 386,219 361,146    
Municipal Lease Finance Receivables [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 45,933 45,547    
Total loans 45,933 45,547    
Less: Allowance for credit losses (100) (74) $ (623) $ (775)
Consumer and other loans [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 74,665 86,006    
Total loans 74,665 86,006    
SBA - Paycheck Protection Program (PPP) [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Notes receivable gross 186,585 882,986    
Total loans 186,585 882,986    
Less: Allowance for credit losses $ 0 $ 0