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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, 2023 | Dec. 31, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | $ 8,913 |  | $ 5,821 |
Nonaccrual |  | 21,302 | [1] | 4,930 | [2],[3]
Nonaccrual with No Allowance for Credit Losses |  | 5,131 |  | 4,094 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total loans, at amortized cost |  | 8,904,910 |  | 9,079,392 |
30-59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 547 |  | 549 |
Nonaccrual |  | 16,000 |  |  |
60-89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 108 |  | 570 |
Greater than 89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 8,258 |  | 4,702 |
Nonaccrual |  | 8,300 |  | 4,700 |
Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  | 8,895,997 |  | 9,073,571 |
Commercial Real Estate Owner Occupied [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 2,805 |  | 2,639 |
Nonaccrual |  | 2,505 | [1] | 2,639 | [2],[3]
Nonaccrual with No Allowance for Credit Losses |  | 2,505 |  | 2,639 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total loans, at amortized cost |  | 2,433,252 |  | 2,485,110 |
Commercial Real Estate Owner Occupied [Member] | 30-59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 300 |  | 0 |
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 |  | 2,505 |  | 2,639 |
Commercial Real Estate Owner Occupied [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  | 2,430,447 |  | 2,482,471 |
Commercial Real Estate Non-owner Occupied [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 547 |  | 0 |
Nonaccrual |  | 12,935 | [1] | 18 | [2],[3]
Nonaccrual with No Allowance for Credit Losses |  | 548 |  | 18 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total loans, at amortized cost |  | 4,351,253 |  | 4,399,838 |
Commercial Real Estate Non-owner Occupied [Member] | 30-59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 16 |  | 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 |  | 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 |  | 4,350,706 |  | 4,399,838 |
Construction Speculative [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 0 | [4]
Nonaccrual |  | 0 | [1] | 0 | [2],[3]
Nonaccrual with No Allowance for Credit Losses |  | 0 |  | 0 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total loans, at amortized cost |  | 57,921 |  | 67,436 | [4]
Construction Speculative [Member] | 30-59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 0 | [4]
Construction Speculative [Member] | 60-89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 0 | [4]
Construction Speculative [Member] | Greater than 89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 0 | [4]
Construction Speculative [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  | 57,921 |  | 67,436 | [4]
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 |  | 0 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total loans, at amortized cost |  | 8,813 |  | 20,835 |
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 |  | 8,813 |  | 20,835 |
Small Business Administration [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 1,077 |  | 999 |
Nonaccrual |  | 969 | [1] | 443 | [2],[3]
Nonaccrual with No Allowance for Credit Losses |  | 787 |  | 268 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total loans, at amortized cost |  | 270,619 |  | 290,908 |
Small Business Administration [Member] | 30-59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 374 |
Small Business Administration [Member] | 60-89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 108 |  | 182 |
Small Business Administration [Member] | Greater than 89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 969 |  | 443 |
Small Business Administration [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  | 269,542 |  | 289,909 |
SBA - Paycheck Protection Program (PPP) [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 0 |
Nonaccrual |  | 0 | [1] | 0 | [2],[3]
Loans Not Past Due |  | 2,736 |  | 9,087 |
Nonaccrual with No Allowance for Credit Losses |  | 0 |  | 0 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total loans, at amortized cost |  | 2,736 |  | 9,087 |
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 |  | 2,736 |  | 9,087 |
Commercial and Industrial [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 4,265 |  | 1,318 |
Nonaccrual |  | 4,509 | [1] | 1,320 | [2],[3]
Nonaccrual with No Allowance for Credit Losses |  | 908 |  | 771 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total loans, at amortized cost |  | 969,895 |  | 948,683 |
Commercial and Industrial [Member] | 30-59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 12 |  | 0 |
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 |  | 4,253 |  | 1,318 |
Commercial and Industrial [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  | 965,630 |  | 947,365 |
Dairy & Livestock and Agribusiness [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 269 |
Nonaccrual | [1] | 60 |  |  |
Nonaccrual with No Allowance for Credit Losses |  | 60 |  | 364 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total loans, at amortized cost |  | 412,891 |  | 433,564 |
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 |  | 269 |
Dairy & Livestock and Agribusiness [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  | 412,891 |  | 433,295 |
Municipal Lease Finance Receivables [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 0 |
Nonaccrual |  | 0 | [1] | 0 | [2],[3]
Loans Not Past Due |  | 73,590 |  | 81,126 |
Nonaccrual with No Allowance for Credit Losses |  | 0 |  | 0 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total loans, at amortized cost |  | 73,590 |  | 81,126 |
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 |  | 73,590 |  | 81,126 |
SFR Mortgage [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 201 |  | 388 |
Nonaccrual |  | 324 | [1] | 0 | [2],[3]
Nonaccrual with No Allowance for Credit Losses |  | 323 |  | 0 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total loans, at amortized cost |  | 269,868 |  | 266,024 |
SFR Mortgage [Member] | 30-59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 201 |  | 0 |
SFR Mortgage [Member] | 60-89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 388 |
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 |  | 269,667 |  | 265,636 |
Consumer and Other Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 18 |  | 208 |
Nonaccrual |  | 0 | [1] | 33 | [2],[3]
Nonaccrual with No Allowance for Credit Losses |  | 0 |  | 34 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total loans, at amortized cost |  | 54,072 |  | 76,781 |
Consumer and Other Loans [Member] | 30-59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 18 |  | 175 |
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 |
Consumer and Other Loans [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  | $ 54,054 |  | $ 76,573 |
[1] | 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.
[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.

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