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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 | Jun. 30, 2023 | Dec. 31, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | $ 6,961 |  | $ 5,821 |
Total Loans and Financing Receivables | 8,907,397 |  | 9,079,392 |
Nonaccrual with No Allowance for Credit Losses | 4,791 |  | 4,094 |
Nonaccrual | 6,454 | [1] | 4,930 | [2],[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 | 532 |  | 549 |
60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 1,118 |  | 570 |
Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 5,311 |  | 4,702 |
Financial Asset Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 8,900,436 |  | 9,073,571 |
Commercial Real Estate Owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 3,142 |  | 2,639 |
Total Loans and Financing Receivables | 2,497,237 |  | 2,485,110 |
Nonaccrual with No Allowance for Credit Losses | 3,142 |  | 2,639 |
Nonaccrual | 3,142 | [1] | 2,639 | [2],[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 |  | 0 |
Commercial Real Estate Owner Occupied [Member] | 60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 563 |  | 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 | 2,579 |  | 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 | 2,494,095 |  | 2,482,471 |
Commercial Real Estate Non-owner Occupied [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 532 |  | 0 |
Total Loans and Financing Receivables | 4,406,858 |  | 4,399,838 |
Nonaccrual with No Allowance for Credit Losses | 17 |  | 18 |
Nonaccrual | 17 | [1] | 18 | [2],[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 | 532 |  | 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 | 0 |  | 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 | 4,406,326 |  | 4,399,838 |
Construction Speculative [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 | [4] | 0 | [5]
Total Loans and Financing Receivables | 57,312 | [4] | 67,436 | [5]
Nonaccrual with No Allowance for Credit Losses | 0 | [6] | 0 | [7]
Nonaccrual | 0 | [1],[6] | 0 | [2],[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 | 57,312 | [4] | 67,436 | [5]
Construction Non-speculative [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Total Loans and Financing Receivables | 11,524 |  | 20,835 |
Nonaccrual with No Allowance for Credit Losses | 0 |  | 0 |
Nonaccrual | 0 | [1] | 0 | [2],[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 | 11,524 |  | 20,835 |
SBA [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 629 |  | 999 |
Total Loans and Financing Receivables | 278,904 |  | 290,908 |
Nonaccrual with No Allowance for Credit Losses | 445 |  | 268 |
Nonaccrual | 629 | [1] | 443 | [2],[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 | 0 |  | 374 |
SBA [Member] | 60-89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 182 |
SBA [Member] | Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 629 |  | 443 |
SBA [Member] | Financial Asset Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 278,275 |  | 289,909 |
SBA - Paycheck Protection Program (PPP) [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Loans Not Past Due | 5,017 |  | 9,087 |
Total Loans and Financing Receivables | 5,017 |  | 9,087 |
Nonaccrual with No Allowance for Credit Losses | 0 |  | 0 |
Nonaccrual | 0 | [1] | 0 | [2],[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 | 5,017 |  | 9,087 |
Commercial and Industrial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 2,038 |  | 1,318 |
Total Loans and Financing Receivables | 956,242 |  | 948,683 |
Nonaccrual with No Allowance for Credit Losses | 672 |  | 771 |
Nonaccrual | 2,039 | [1] | 1,320 | [2],[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 | 0 |  | 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 | 2,038 |  | 1,318 |
Commercial and Industrial [Member] | Financial Asset Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 954,204 |  | 947,365 |
Dairy & Livestock and Agribusiness [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 620 |  | 269 |
Total Loans and Financing Receivables | 298,247 |  | 433,564 |
Nonaccrual with No Allowance for Credit Losses | 161 |  | 364 |
Nonaccrual | 273 | [1] | 477 | [2],[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 | 555 |  | 0 |
Dairy & Livestock and Agribusiness [Member] | Greater than 89 Days Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 65 |  | 269 |
Dairy & Livestock and Agribusiness [Member] | Financial Asset Not Past Due [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Not Past Due | 297,627 |  | 433,295 |
Municipal Lease Finance Receivables [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 0 |
Loans Not Past Due | 77,867 |  | 81,126 |
Total Loans and Financing Receivables | 77,867 |  | 81,126 |
Nonaccrual with No Allowance for Credit Losses | 0 |  | 0 |
Nonaccrual | 0 | [1] | 0 | [2],[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 | 77,867 |  | 81,126 |
SFR Mortgage [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 388 |
Total Loans and Financing Receivables | 263,201 |  | 266,024 |
Nonaccrual with No Allowance for Credit Losses | 354 |  | 0 |
Nonaccrual | 354 | [1] | 0 | [2],[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 |  | 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 | 263,201 |  | 265,636 |
Consumer and Other Loans [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total Past Due | 0 |  | 208 |
Total Loans and Financing Receivables | 54,988 |  | 76,781 |
Nonaccrual with No Allowance for Credit Losses | 0 |  | 34 |
Nonaccrual | 0 | [1] | 33 | [2],[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 |  | 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 | $ 54,988 |  | $ 76,573 |
[1] | As of June 30, 2023, $580,000 of nonaccruing loans were current, $563,000 were 60-89 days past due, and $5.3 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.
[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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