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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 | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross | $ 8,363,632 | $ 8,536,432
Construction | 15,706 | 16,082
Total loans, at amortized cost | 8,363,632 | 8,536,432
Less: Allowance for credit losses | (78,252) | (80,122)
Net loans and lease finance receivables | 8,285,380 | 8,456,310
Commercial And Industrial [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross | 942,301 | 925,178
SBA [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross | 271,844 | 273,013
SBA - Paycheck Protection Program (PPP) [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross | 179 | 774
Total loans, at amortized cost | 179 | 774
Commercial real estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross | 6,490,604 | 6,507,452
SFR mortgage [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross | 269,493 | 269,172
Dairy And Livestock And Agribusiness [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross | 252,532 | 419,904
Municipal Lease Finance Receivables [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross | 65,203 | 66,114
Total loans, at amortized cost | 65,203 | 66,114
Consumer, Other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Notes receivable gross | $ 55,770 | $ 58,743

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