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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 ($) | Jun. 30, 2024 | Dec. 31, 2023
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | $ 24,881,000 |  | $ 8,913,000 |
Total Loans and Financing Receivables | 8,681,846,000 |  | 8,904,910,000 |
Nonaccrual with No Allowance for Credit Losses | (24,957,000) |  | 5,131,000 |
Nonaccrual | 24,957,000 | [1],[2] | 21,302,000 | [3]
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 | 225,000 |  | 547,000 |
Nonaccrual | 122,000 |  | 16,000,000 |
60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 43,000 |  | 108,000 |
Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 24,613,000 |  | 8,258,000 |
Nonaccrual | 24,600,000 |  | 8,300,000 |
Financial Asset Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 8,656,965,000 |  | 8,895,997,000 |
Commercial Real Estate Owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 2,354,000 |  | 2,805,000 |
Total Loans and Financing Receivables | 2,393,727,000 |  | 2,433,252,000 |
Nonaccrual with No Allowance for Credit Losses | 2,311,000 |  | 2,505,000 |
Nonaccrual | 2,311,000 | [1],[2] | 2,505,000 | [3]
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 |  | 300,000 |
Commercial Real Estate Owner Occupied [Member] | 60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 43,000 |  | 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 | 2,311,000 |  | 2,505,000 |
Commercial Real Estate Owner Occupied [Member] | Financial Asset Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 2,391,373,000 |  | 2,430,447,000 |
Commercial Real Estate Non-owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 19,597,000 |  | 547,000 |
Total Loans and Financing Receivables | 4,271,198,000 |  | 4,351,253,000 |
Nonaccrual with No Allowance for Credit Losses | 19,597,000 |  | 548,000 |
Nonaccrual | 19,597,000 | [1],[2] | 12,935,000 | [3]
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 |  | 16,000 |
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 | 19,597,000 |  | 531,000 |
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 | 4,251,601,000 |  | 4,350,706,000 |
Construction Speculative [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 | [4] | 0 | [5]
Total Loans and Financing Receivables | 40,545,000 | [4] | 57,921,000 | [5]
Nonaccrual with No Allowance for Credit Losses | 0 | [6] | 0 | [7]
Nonaccrual | 0 | [1],[2],[6] | 0 | [3],[7]
Loans Past Due Over 89 Days Still Accruing | 0 | [6] | 0 | [7]
Construction Speculative [Member] | 30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 | [4] | 0 | [5]
Construction Speculative [Member] | 60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 | [4] | 0 | [5]
Construction Speculative [Member] | Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 | [4] | 0 | [5]
Construction Speculative [Member] | Financial Asset Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 40,545,000 | [4] | 57,921,000 | [5]
Construction Non-speculative [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Total Loans and Financing Receivables | 11,682,000 |  | 8,813,000 |
Nonaccrual with No Allowance for Credit Losses | 0 |  | 0 |
Nonaccrual | 0 | [1],[2] | 0 | [3]
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 | 11,682,000 |  | 8,813,000 |
SBA [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 337,000 |  | 1,077,000 |
Total Loans and Financing Receivables | 267,938,000 |  | 270,619,000 |
Nonaccrual with No Allowance for Credit Losses | 337,000 |  | 787,000 |
Nonaccrual | 337,000 | [1],[2] | 969,000 | [3]
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 | 122,000 |  | 0 |
SBA [Member] | 60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 108,000 |
SBA [Member] | Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 215,000 |  | 969,000 |
SBA [Member] | Financial Asset Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 267,601,000 |  | 269,542,000 |
SBA - Paycheck Protection Program (PPP) [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Loans Not Past Due | 1,757,000 |  | 2,736,000 |
Total Loans and Financing Receivables | 1,757,000 |  | 2,736,000 |
Nonaccrual with No Allowance for Credit Losses | 0 |  | 0 |
Nonaccrual | 0 | [1],[2] | 0 | [3]
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
SBA - Paycheck Protection Program (PPP) [Member] | 30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
SBA - Paycheck Protection Program (PPP) [Member] | 60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
SBA - Paycheck Protection Program (PPP) [Member] | Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
SBA - Paycheck Protection Program (PPP) [Member] | Financial Asset Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 1,757,000 |  | 2,736,000 |
Commercial and Industrial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 2,593,000 |  | 4,265,000 |
Total Loans and Financing Receivables | 956,184,000 |  | 969,895,000 |
Nonaccrual with No Allowance for Credit Losses | 2,712,000 |  | 908,000 |
Nonaccrual | 2,712,000 | [1],[2] | 4,509,000 | [3]
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 | 103,000 |  | 12,000 |
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 | 2,490,000 |  | 4,253,000 |
Commercial and Industrial [Member] | Financial Asset Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 953,591,000 |  | 965,630,000 |
Dairy & Livestock and Agribusiness [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Total Loans and Financing Receivables | 350,562,000 |  | 412,891,000 |
Nonaccrual with No Allowance for Credit Losses | 0 |  | 60,000 |
Nonaccrual | 0 | [1],[2] | 60,000 | [3]
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 | 0 |  | 0 |
Dairy & Livestock and Agribusiness [Member] | Financial Asset Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 350,562,000 |  | 412,891,000 |
Municipal Lease Finance Receivables [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Loans Not Past Due | 70,889,000 |  | 73,590,000 |
Total Loans and Financing Receivables | 70,889,000 |  | 73,590,000 |
Nonaccrual with No Allowance for Credit Losses | 0 |  | 0 |
Nonaccrual | 0 | [1],[2] | 0 | [3]
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 | 70,889,000 |  | 73,590,000 |
SFR Mortgage [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 201,000 |
Total Loans and Financing Receivables | 267,593,000 |  | 269,868,000 |
Nonaccrual with No Allowance for Credit Losses | 0 |  | (323,000) |
Nonaccrual | 0 | [1],[2] | 324,000 | [3]
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 |  | 201,000 |
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 | 267,593,000 |  | 269,667,000 |
Consumer and Other Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 18,000 |
Total Loans and Financing Receivables | 49,771,000 |  | 54,072,000 |
Nonaccrual with No Allowance for Credit Losses | 0 |  | 0 |
Nonaccrual | 0 | [1],[2] | 0 | [3]
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 |  | 18,000 |
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 | $ 49,771,000 |  | $ 54,054,000 |
[1] | As of June 30, 2024, $223,000 of nonaccruing loans were current, $122,000 were 30-59 days past due, and $24.6 million were 90+ days past due.
[2] | Excludes $157,000 of guaranteed portion of nonaccrual SBA loans that are in process of collection.
[3] | 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.
[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.
[7] | Speculative construction loans are generally for properties where there is no identified buyer or renter.

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