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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
Sep. 30, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross $ 8,470,906 $ 8,536,432
Construction 29,976 16,082
Total loans, at amortized cost 8,470,906 8,536,432
Less: Allowance for credit losses (79,336) (80,122)
Net loans and lease finance receivables 8,391,570 8,456,310
Commercial real estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 6,535,319 6,507,452
SBA [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 266,228 273,013
SBA - Paycheck Protection Program (PPP) [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 51 774
Total loans, at amortized cost 51 774
Commercial And Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 939,174 925,178
Dairy And Livestock And Agribusiness [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 292,963 419,904
Municipal Lease Finance Receivables [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 61,383 66,114
Total loans, at amortized cost 61,383 66,114
SFR mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross 286,111 269,172
Consumer and Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Notes receivable gross $ 59,701 $ 58,743