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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 ($) | Sep. 30, 2024 | Dec. 31, 2023
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | $ 52,472,000 |  | $ 8,913,000 |
Nonaccrual | 21,913,000 | [1],[2] | 21,302,000 | [3]
Nonaccrual with No Allowance for Credit Losses | 21,774,000 |  | 5,131,000 |
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Loan And Leases Receivable Gross Carrying Amount | 8,572,565,000 |  | 8,904,910,000 |
30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 14,059,000 |  | 108,000 |
Nonaccrual | 8,000,000 |  | 16,000,000,000 |
60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 24,788,000 |  | 547,000 |
Nonaccrual | 60,000 |  |  |
Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 13,625,000 |  | 8,258,000 |
Nonaccrual | 13,600,000 |  | 8,300,000 |
Financial Asset Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 8,520,093,000 |  | 8,895,997,000 |
Commercial Real Estate Owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 2,385,000 |  | 2,805,000 |
Nonaccrual | 598,000 | [1],[2] | 2,505,000 | [3]
Nonaccrual with No Allowance for Credit Losses | 598,000 |  | 2,505,000 |
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Loan And Leases Receivable Gross Carrying Amount | 2,364,384,000 |  | 2,433,252,000 |
Commercial Real Estate Owner Occupied [Member] | 30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 1,051,000 |  | 0 |
Commercial Real Estate Owner Occupied [Member] | 60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 736,000 |  | 300,000 |
Commercial Real Estate Owner Occupied [Member] | Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 598,000 |  | 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 | 2,361,999,000 |  | 2,430,447,000 |
Commercial Real Estate Non-owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 47,110,000 |  | 547,000 |
Nonaccrual | 18,196,000 | [1],[2] | 12,935,000 | [3]
Nonaccrual with No Allowance for Credit Losses | (18,196,000) |  | (548,000) |
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Loan And Leases Receivable Gross Carrying Amount | 4,254,253,000 |  | 4,351,253,000 |
Commercial Real Estate Non-owner Occupied [Member] | 30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 12,899,000 |  | 0 |
Commercial Real Estate Non-owner Occupied [Member] | 60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 23,928,000 |  | 16,000 |
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 | 10,283,000 |  | 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 | 4,207,143,000 |  | 4,350,706,000 |
Construction Speculative [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Nonaccrual | 0 |  | 0 |
Nonaccrual with No Allowance for Credit Losses | 0 |  | 0 |
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Loan And Leases Receivable Gross Carrying Amount | 7,892,000 |  | 57,921,000 |
Construction Speculative [Member] | 30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Construction Speculative [Member] | 60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Construction Speculative [Member] | Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Construction Speculative [Member] | Financial Asset Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 7,892,000 |  | 57,921,000 |
Construction Non-speculative [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Nonaccrual | 0 |  | 0 |
Nonaccrual with No Allowance for Credit Losses | 0 |  | 0 |
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Loan And Leases Receivable Gross Carrying Amount | 6,863,000 |  | 8,813,000 |
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 |  |  |
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 | 6,863,000 |  | 8,813,000 |
SBA [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 152,000 |  | 1,077,000 |
Nonaccrual | 151,000 | [1],[2] | 969,000 | [3]
Nonaccrual with No Allowance for Credit Losses | 151,000 |  | 787,000 |
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Loan And Leases Receivable Gross Carrying Amount | 272,001,000 |  | 270,619,000 |
SBA [Member] | 30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 109,000 |  | 108,000 |
SBA [Member] | 60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
SBA [Member] | Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 43,000 |  | 969,000 |
SBA [Member] | Financial Asset Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 271,849,000 |  | 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 | 1,255,000 |  | 2,736,000 |
Nonaccrual | 0 |  | 0 | [3]
Nonaccrual with No Allowance for Credit Losses | 0 |  | 0 |
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Loan And Leases Receivable Gross Carrying Amount | 1,255,000 |  | 2,736,000 |
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 | 64,000 |  | 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 | 1,255,000 |  | 2,736,000 |
Commercial and Industrial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 2,683,000 |  | 4,265,000 |
Nonaccrual | 2,825,000 | [1],[2] | 4,509,000 | [3]
Nonaccrual with No Allowance for Credit Losses | 2,686,000 |  | 908,000 |
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Loan And Leases Receivable Gross Carrying Amount | 342,445,000 |  | 969,895,000 |
Commercial and Industrial [Member] | 30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Commercial and Industrial [Member] | 60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 12,000 |
Commercial and Industrial [Member] | Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 2,619,000 |  | 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 | 933,806,000 |  | 965,630,000 |
Dairy & Livestock and Agribusiness [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 142,000 |  | 0 |
Nonaccrual | 143,000 | [1],[2] | 60,000 | [3]
Nonaccrual with No Allowance for Credit Losses | 143,000 |  | 60,000 |
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Loan And Leases Receivable Gross Carrying Amount | 936,489,000 |  | 412,891,000 |
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 | 60,000 |  | 0 |
Dairy & Livestock and Agribusiness [Member] | Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 82,000 |  | 0 |
Dairy & Livestock and Agribusiness [Member] | Financial Asset Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 342,303,000 |  | 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 | 67,585,000 |  | 73,590,000 |
Nonaccrual | 0 |  | 0 |
Nonaccrual with No Allowance for Credit Losses | 0 |  | 0 |
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Loan And Leases Receivable Gross Carrying Amount | 67,585,000 |  | 73,590,000 |
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 | 67,585,000 |  | 73,590,000 |
SFR Mortgage [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 201,000 |
Nonaccrual | 0 |  | 324,000 | [3]
Nonaccrual with No Allowance for Credit Losses | 0 |  | (323,000) |
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Loan And Leases Receivable Gross Carrying Amount | 267,181,000 |  | 269,868,000 |
SFR Mortgage [Member] | 30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
SFR Mortgage [Member] | 60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 201,000 |
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 | 267,181,000 |  | 269,667,000 |
Consumer and Other Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 18,000 |
Nonaccrual | 0 |  | 0 |
Nonaccrual with No Allowance for Credit Losses | 0 |  | 0 |
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Loan And Leases Receivable Gross Carrying Amount | 52,217,000 |  | 54,072,000 |
Consumer and Other Loans [Member] | 30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Consumer and Other Loans [Member] | 60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 18,000 |
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 | $ 52,217,000 |  | $ 54,054,000 |
[1] | As of September 30, 2024, $206,000 of nonaccruing loans were current, $8.0 million were 30-59 days past due, $60,000 were 60-89 days past due, and $13.6 million were 90+ days past due.
[2] | Excludes $165,000 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.

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