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Loans and Lease Finance Receivables and Allowance for Credit Losses - Schedule of Recorded Investment in, and Aging of, Past Due and Nonaccrual Loans, Including PCI Loans by Class of Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | $ 26,842 |  | $ 8,913 |
Total Loans and Financing Receivables | 8,536,432 |  | 8,904,910 |
Nonaccrual with No Allowance for Credit Losses | 27,273 |  | 5,131 |
Nonaccrual | 27,795 | [1] | 21,302 | [2]
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 399 |  | 547 |
Nonaccrual |  |  | 16,000 |
60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 190 |  | 108 |
Nonaccrual | 102,000 |  |  |
Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 26,253 |  | 8,258 |
Nonaccrual | 26,300 |  | 8,300 |
Financial Asset, Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 8,509,590 |  | 8,895,997 |
Commercial Real Estate Owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 196 |  | 2,805 |
Total Loans and Financing Receivables | 2,329,576 |  | 2,433,252 |
Nonaccrual with No Allowance for Credit Losses | 1,436 |  | 2,505 |
Nonaccrual | 1,436 | [1] | 2,505 | [2]
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Commercial Real Estate Owner Occupied [Member] | 30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 300 |
Commercial Real Estate Owner Occupied [Member] | 60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Commercial Real Estate Owner Occupied [Member] | Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 196 |  | 2,505 |
Commercial Real Estate Owner Occupied [Member] | Financial Asset, Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 2,329,380 |  | 2,430,447 |
Commercial Real Estate Non-owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 24,430 |  | 547 |
Total Loans and Financing Receivables | 4,177,876 |  | 4,351,253 |
Nonaccrual with No Allowance for Credit Losses | 24,430 |  | 548 |
Nonaccrual | 24,430 | [1] | 12,935 | [2]
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Commercial Real Estate Non-owner Occupied [Member] | 30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 16 |
Commercial Real Estate Non-owner Occupied [Member] | 60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Commercial Real Estate Non-owner Occupied [Member] | Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 24,430 |  | 531 |
Commercial Real Estate Non-owner Occupied [Member] | Financial Asset, Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 4,153,446 |  | 4,350,706 |
Construction Speculative [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 | [3] | 0 | [4]
Total Loans and Financing Receivables | 8,091 | [3] | 57,921 | [4]
Nonaccrual with No Allowance for Credit Losses | 0 | [5] | 0 | [6]
Nonaccrual | 0 | [1],[5] | 0 | [2],[6]
Loans Past Due Over 89 Days Still Accruing | 0 | [5] | 0 | [6]
Construction Speculative [Member] | 30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 | [3] | 0 | [4]
Construction Speculative [Member] | 60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 | [3] | 0 | [4]
Construction Speculative [Member] | Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 | [3] | 0 | [4]
Construction Speculative [Member] | Financial Asset, Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 8,091 | [3] | 57,921 | [4]
Construction Non-speculative [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Total Loans and Financing Receivables | 7,991 |  | 8,813 |
Nonaccrual with No Allowance for Credit Losses | 0 |  | 0 |
Nonaccrual | 0 | [1] | 0 | [2]
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Construction Non-speculative [Member] | 30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Construction Non-speculative [Member] | 60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Construction Non-speculative [Member] | Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Construction Non-speculative [Member] | Financial Asset, Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 7,991 |  | 8,813 |
SBA [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 1,617 |  | 1,077 |
Total Loans and Financing Receivables | 273,013 |  | 270,619 |
Nonaccrual with No Allowance for Credit Losses | 1,146 |  | 787 |
Nonaccrual | 1,529 | [1] | 969 | [2]
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
SBA [Member] | 30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
SBA [Member] | 60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 190 |  | 108 |
SBA [Member] | Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 1,427 |  | 969 |
SBA [Member] | Financial Asset, Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 271,396 |  | 269,542 |
SBA - PPP [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Loans Not Past Due | 774 |  | 2,736 |
Total Loans and Financing Receivables | 774 |  | 2,736 |
Nonaccrual with No Allowance for Credit Losses | 0 |  | 0 |
Nonaccrual | 0 | [1] | 0 | [2]
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
SBA - PPP [Member] | 30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
SBA - PPP [Member] | 60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
SBA - PPP [Member] | Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
SBA - PPP [Member] | Financial Asset, Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 774 |  | 2,736 |
Commercial and Industrial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 539 |  | 4,265 |
Total Loans and Financing Receivables | 925,178 |  | 969,895 |
Nonaccrual with No Allowance for Credit Losses | 201 |  | 908 |
Nonaccrual | 340 | [1] | 4,509 | [2]
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Commercial and Industrial [Member] | 30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 399 |  | 12 |
Commercial and Industrial [Member] | 60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Commercial and Industrial [Member] | Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 140 |  | 4,253 |
Commercial and Industrial [Member] | Financial Asset, Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 924,639 |  | 965,630 |
Dairy & Livestock and Agribusiness [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 60 |  | 0 |
Total Loans and Financing Receivables | 419,904 |  | 412,891 |
Nonaccrual with No Allowance for Credit Losses | 60 |  | 60 |
Nonaccrual | 60 | [1] | 60 | [2]
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Dairy & Livestock and Agribusiness [Member] | 30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Dairy & Livestock and Agribusiness [Member] | 60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Dairy & Livestock and Agribusiness [Member] | Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 60 |  | 0 |
Dairy & Livestock and Agribusiness [Member] | Financial Asset, Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 419,844 |  | 412,891 |
Municipal Lease Finance Receivables [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Loans Not Past Due | 66,114 |  | 73,590 |
Total Loans and Financing Receivables | 66,114 |  | 73,590 |
Nonaccrual with No Allowance for Credit Losses | 0 |  | 0 |
Nonaccrual | 0 | [1] | 0 | [2]
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Municipal Lease Finance Receivables [Member] | 30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Municipal Lease Finance Receivables [Member] | 60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Municipal Lease Finance Receivables [Member] | Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Municipal Lease Finance Receivables [Member] | Financial Asset, Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 66,114 |  | 73,590 |
SFR Mortgage [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 201 |
Total Loans and Financing Receivables | 269,172 |  | 269,868 |
Nonaccrual with No Allowance for Credit Losses | 0 |  | 323 |
Nonaccrual | 0 | [1] | 324 | [2]
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
SFR Mortgage [Member] | 30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 201 |
SFR Mortgage [Member] | 60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
SFR Mortgage [Member] | Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
SFR Mortgage [Member] | Financial Asset, Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 269,172 |  | 269,667 |
Consumer and other loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 18 |
Loans Not Past Due | 58,743 |  | 54,072 |
Total Loans and Financing Receivables | 58,743 |  | 54,072 |
Nonaccrual with No Allowance for Credit Losses | 0 |  | 0 |
Nonaccrual | 0 | [1] | 0 | [2]
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Consumer and other loans [Member] | 30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 18 |
Consumer and other loans [Member] | 60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Consumer and other loans [Member] | Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Consumer and other loans [Member] | Financial Asset, Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | $ 58,743 |  | $ 54,054 |
[1] | As of December 31, 2024, $1.4 milli on of nonaccruing loans were current, $102,000 were 60-89 days past due, and $26.3 million were 90+ days past due.
[2] | As of December 31, 2023, $13.0 million of nonaccruing loans were current, $16,000 were 30-59 days past due, and $8.3 million were 90+ days past due.
[3] | Speculative construction loans are generally for properties where there is no identified buyer or renter.
[4] | Speculative construction loans are generally for properties where there is no identified buyer or renter.
[5] | Speculative construction loans are generally for properties where there is no identified buyer or renter.
[6] | Speculative construction loans are generally for properties where there is no identified buyer or renter.

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