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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, 2022 | Dec. 31, 2021
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | $ 9,817,000 |  | $ 8,176,000 |
Loans Not Past Due |  | 8,764,319,000 |  | 7,879,537,000 |
Nonaccrual |  | 10,117,000 | [1] | 6,893,000 | [2]
Nonaccrual with No Allowance for Credit Losses |  | 8,904,000 |  | 5,992,000 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total gross loans |  | 8,774,136,000 |  | 7,887,713,000 |
30-59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 80,000 |  | 1,895,000 |
Nonaccrual |  | 80,000 |  | 332,000 |
60-89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 142,000 |  | 1,161,000 |
Nonaccrual |  | 142,000 |  | 267,000 |
Greater than 89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 9,595,000 |  | 5,120,000 |
Nonaccrual |  | 9,600,000 |  | 5,100,000 |
Commercial Real Estate Owner Occupied [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 6,686,000 |  | 3,821,000 |
Loans Not Past Due |  | 2,431,460,000 |  | 2,127,979,000 |
Nonaccrual |  | 6,686,000 | [1] | 3,607,000 | [2]
Nonaccrual with No Allowance for Credit Losses |  | (6,686,000) |  | 3,607,000 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total gross loans |  | 2,438,146,000 |  | 2,131,800,000 |
Commercial Real Estate Owner Occupied [Member] | 30-59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 438,000 |
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 |  | 6,686,000 |  | 3,383,000 |
Commercial Real Estate Non-owner Occupied [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 0 |
Loans Not Past Due |  | 4,247,099,000 |  | 3,657,930,000 |
Nonaccrual |  | 19,000 | [1] | 0 | [2]
Nonaccrual with No Allowance for Credit Losses |  | (19,000) |  | 0 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total gross loans |  | 4,247,099,000 |  | 3,657,930,000 |
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 |  | 0 |  | 0 |
Construction Speculative [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due | [3] | 0 |  | 0 |
Loans Not Past Due | [3] | 56,183,000 |  | 44,859,000 |
Nonaccrual | [4] | 0 | [1] | 0 | [2]
Nonaccrual with No Allowance for Credit Losses | [4] | 0 |  | 0 |
Loans Past Due Over 89 Days Still Accruing | [4] | 0 |  | 0 |
Total gross loans | [3] | 56,183,000 |  | 44,859,000 |
Construction Speculative [Member] | 30-59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due | [3] | 0 |  | 0 |
Construction Speculative [Member] | 60-89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due | [3] | 0 |  | 0 |
Construction Speculative [Member] | Greater than 89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due | [3] | 0 |  | 0 |
Construction Non-speculative [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 0 |
Loans Not Past Due |  | 20,312,000 |  | 17,405,000 |
Nonaccrual |  | 0 | [1] | 0 | [2]
Nonaccrual with No Allowance for Credit Losses |  |  |  | 0 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total gross loans |  | 20,312,000 |  | 17,405,000 |
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 |  | 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 |
SBA [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 880,000 |  | 1,901,000 |
Loans Not Past Due |  | 295,784,000 |  | 286,699,000 |
Nonaccrual |  | 1,065,000 | [1] | 1,034,000 | [2]
Nonaccrual with No Allowance for Credit Losses |  | (415,000) |  | 521,000 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total gross loans |  | 296,664,000 |  | 288,600,000 |
SBA [Member] | 30-59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 417,000 |
SBA [Member] | 60-89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 1,145,000 |
SBA [Member] | Greater than 89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 880,000 |  | 339,000 |
SBA - Paycheck Protection Program (PPP) [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 0 |
Loans Not Past Due |  | 17,348,000 |  | 186,585,000 |
Nonaccrual |  | 0 | [1] | 0 | [2]
Nonaccrual with No Allowance for Credit Losses |  |  |  | 0 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total gross loans |  | 17,348,000 |  | 186,585,000 |
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 |
Commercial and Industrial [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 1,308,000 |  | 1,372,000 |
Loans Not Past Due |  | 950,923,000 |  | 811,691,000 |
Nonaccrual |  | 1,308,000 | [1] | 1,714,000 | [2]
Nonaccrual with No Allowance for Credit Losses |  | (940,000) |  | 1,326,000 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total gross loans |  | 952,231,000 |  | 813,063,000 |
Commercial and Industrial [Member] | 30-59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 80,000 |  | 0 |
Commercial and Industrial [Member] | 60-89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 142,000 |  | 16,000 |
Commercial and Industrial [Member] | Greater than 89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 1,086,000 |  | 1,356,000 |
Dairy & Livestock and Agribusiness [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 911,000 |  | 0 |
Loans Not Past Due |  | 322,194,000 |  | 386,219,000 |
Nonaccrual |  | 1,007,000 | [1] | 0 | [2]
Nonaccrual with No Allowance for Credit Losses |  | (812,000) |  | 0 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total gross loans |  | 323,105,000 |  | 386,219,000 |
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 |  | 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 |  | 911,000 |  | 0 |
Municipal Lease Finance Receivables [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 0 |
Loans Not Past Due |  | 76,656,000 |  | 45,933,000 |
Nonaccrual |  | 0 | [1] | 0 | [2]
Nonaccrual with No Allowance for Credit Losses |  |  |  | 0 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total gross loans |  | 76,656,000 |  | 45,933,000 |
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 |
SFR Mortgage [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 1,040,000 |
Loans Not Past Due |  | 263,646,000 |  | 239,614,000 |
Nonaccrual |  | 0 | [1] | 380,000 | [2]
Nonaccrual with No Allowance for Credit Losses |  |  |  | (380,000) |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total gross loans |  | 263,646,000 |  | 240,654,000 |
SFR Mortgage [Member] | 30-59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 1,040,000 |
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 |
Consumer and Other Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 32,000 |  | 42,000 |
Loans Not Past Due |  | 82,714,000 |  | 74,623,000 |
Nonaccrual |  | 32,000 | [1] | 158,000 | [2]
Nonaccrual with No Allowance for Credit Losses |  | (32,000) |  | 158,000 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total gross loans |  | 82,746,000 |  | 74,665,000 |
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 |  | 0 |
Consumer and Other Loans [Member] | Greater than 89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | $ 32,000 |  | $ 42,000 |
[1] | As of September 30, 2022, $300,000 of nonaccruing loans were current, $80,000 were 30-59 days past due, $142,000 were 60-89 days past due, and $9.6 million were 90+ days past due.
[2] | As of December 31, 2021, $1.2 million of nonaccruing loans were current, $332,000 were 30-59 days past due, $267,000 were 60-89 days past due, and $5.1 million were 90+ days past due.
[3] | Speculative construction loans are generally for properties where there is no identified buyer or renter.
[4] | Speculative construction loans are generally for properties where there is no identified buyer or renter.

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