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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, 2023 | Dec. 31, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | $ 9,357,000 |  | $ 5,821,000 |
Nonaccrual | 9,963,000 | [1] | 4,930,000 | [2],[3]
Nonaccrual with No Allowance for Credit Losses | (5,932,000) |  | 4,094,000 |
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Total gross loans | 8,877,632,000 |  | 9,079,392,000 |
30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 96,000 |  | 549,000 |
Nonaccrual | 4,000 |  |  |
60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 2,680,000 |  | 570,000 |
Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 6,581,000 |  | 4,702,000 |
Nonaccrual | 6,600,000 |  | 4,700,000 |
Financial Asset Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 8,868,275,000 |  | 9,073,571,000 |
Commercial Real Estate Owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 3,243,000 |  | 2,639,000 |
Nonaccrual | 3,107,000 | [1] | 2,639,000 | [2],[3]
Nonaccrual with No Allowance for Credit Losses | (3,107,000) |  | 2,639,000 |
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Total gross loans | 2,471,720,000 |  | 2,485,110,000 |
Commercial Real Estate Owner Occupied [Member] | 30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 92,000 |  | 0 |
Commercial Real Estate Owner Occupied [Member] | 60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 44,000 |  | 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 | 3,107,000 |  | 2,639,000 |
Commercial Real Estate Owner Occupied [Member] | Financial Asset Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 2,468,477,000 |  | 2,482,471,000 |
Commercial Real Estate Non-owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 531,000 |  | 0 |
Nonaccrual | 548,000 | [1] | 18,000 | [2],[3]
Nonaccrual with No Allowance for Credit Losses | (548,000) |  | (18,000) |
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Total gross loans | 4,371,339,000 |  | 4,399,838,000 |
Commercial Real Estate Non-owner Occupied [Member] | 30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 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 | 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 | 531,000 |  | 0 |
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 | 4,370,808,000 |  | 4,399,838,000 |
Construction Speculative [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 | [4] | 0 | [5]
Nonaccrual | 0 | [1],[6] | 0 | [2],[3],[7]
Nonaccrual with No Allowance for Credit Losses | 0 | [6] | 0 | [7]
Loans Past Due Over 89 Days Still Accruing | 0 | [6] | 0 | [7]
Total gross loans | 53,058,000 | [4] | 67,436,000 | [5]
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 | 53,058,000 | [4] | 67,436,000 | [5]
Construction Non-speculative [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Nonaccrual | 0 | [1] | 0 | [2],[3]
Nonaccrual with No Allowance for Credit Losses |  |  | 0 |
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Total gross loans | 9,964,000 |  | 20,835,000 |
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 | 9,964,000 |  | 20,835,000 |
SBA [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 1,050,000 |  | 999,000 |
Nonaccrual | 1,050,000 | [1] | 443,000 | [2],[3]
Nonaccrual with No Allowance for Credit Losses | (868,000) |  | 268,000 |
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Total gross loans | 283,124,000 |  | 290,908,000 |
SBA [Member] | 30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 374,000 |
SBA [Member] | 60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 54,000 |  | 182,000 |
SBA [Member] | Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 996,000 |  | 443,000 |
SBA [Member] | Financial Asset Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 282,074,000 |  | 289,909,000 |
SBA - Paycheck Protection Program (PPP) [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Loans Not Past Due | 3,233,000 |  | 9,087,000 |
Nonaccrual | 0 | [1] | 0 | [2],[3]
Nonaccrual with No Allowance for Credit Losses |  |  | 0 |
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Total gross loans | 3,233,000 |  | 9,087,000 |
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 | 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 | 3,233,000 |  | 9,087,000 |
Commercial and Industrial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 4,398,000 |  | 1,318,000 |
Nonaccrual | 4,672,000 | [1] | 1,320,000 | [2],[3]
Nonaccrual with No Allowance for Credit Losses | (939,000) |  | 771,000 |
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Total gross loans | 938,064,000 |  | 948,683,000 |
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 | 2,487,000 |  | 0 |
Commercial and Industrial [Member] | Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 1,911,000 |  | 1,318,000 |
Commercial and Industrial [Member] | Financial Asset Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 933,666,000 |  | 947,365,000 |
Dairy & Livestock and Agribusiness [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 131,000 |  | 0 |
Nonaccrual | 243,000 | [1] | 477,000 | [2],[3]
Nonaccrual with No Allowance for Credit Losses | (131,000) |  | 364,000 |
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Total gross loans | 351,463,000 |  | 433,564,000 |
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 | 95,000 |  | 0 |
Dairy & Livestock and Agribusiness [Member] | Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 36,000 |  | 269,000 |
Dairy & Livestock and Agribusiness [Member] | Financial Asset Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 351,332,000 |  | 433,295,000 |
Municipal Lease Finance Receivables [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Loans Not Past Due | 75,621,000 |  | 81,126,000 |
Nonaccrual | 0 | [1] | 0 | [2],[3]
Nonaccrual with No Allowance for Credit Losses |  |  | 0 |
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Total gross loans | 75,621,000 |  | 81,126,000 |
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 | 75,621,000 |  | 81,126,000 |
SFR Mortgage [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 388,000 |
Nonaccrual | 339,000 | [1] | 0 | [2],[3]
Nonaccrual with No Allowance for Credit Losses | (339,000) |  | 0 |
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Total gross loans | 268,171,000 |  | 266,024,000 |
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 |  | 388,000 |
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 | 268,171,000 |  | 265,636,000 |
Consumer and Other Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 4,000 |  | 208,000 |
Nonaccrual | 4,000 | [1] | 33,000 | [2],[3]
Nonaccrual with No Allowance for Credit Losses |  |  | 34,000 |
Loans Past Due Over 89 Days Still Accruing | 0 |  | 0 |
Total gross loans | 51,875,000 |  | 76,781,000 |
Consumer and Other Loans [Member] | 30-59 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 4,000 |  | 175,000 |
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 |  | 33,000 |
Consumer and Other Loans [Member] | Financial Asset Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | $ 51,871,000 |  | $ 76,573,000 |
[1] | As of September 30, 2023, $742,000 of nonaccruing loans were current, $4,000 were 30-59 days past due, $2.6 million were 60-89 days past due, and $6.6 million were 9 0+ days past due.
[2] | As of December 31, 2022, $228,000 of nonaccruing loans were current and $4.7 million were 90+ days past due.
[3] | Excludes $221,000 of guaranteed portion of nonaccrual SBA loans that are in process of collection.
[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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