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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 ($) | Dec. 31, 2022 | Dec. 31, 2021
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | $ 5,821,000 |  | $ 8,176,000 |
Nonaccrual |  | 4,930,000 |  | 6,893,000 | [1]
Loans Not Past Due |  | 9,073,571,000 |  |  |
Nonaccrual with No Allowance for Credit Losses |  | 4,094,000 |  | 5,992,000 |
Loans Past Due Over 89 Days Still Accruing |  |  |  | 0 |
Total loans |  | 9,079,392,000 |  | 7,887,713,000 |
30-59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 549,000 |  | 1,895,000 |
Nonaccrual |  |  |  | 332,000 |
60-89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 570,000 |  | 1,161,000 |
Nonaccrual |  |  |  | 267,000 |
Greater than 89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 4,702,000 |  | 5,120,000 |
Nonaccrual |  | 4,700 |  | 5,100,000 |
Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  |  |  | 7,879,537,000 |
Commercial Real Estate Owner Occupied [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 2,639,000 |  | 3,821,000 |
Nonaccrual |  | 2,639,000 | [2],[3] | 3,607,000 | [1]
Loans Not Past Due |  | 2,482,471,000 |  |  |
Nonaccrual with No Allowance for Credit Losses |  | 2,639,000 |  | 3,607,000 |
Loans Past Due Over 89 Days Still Accruing |  |  |  | 0 |
Total loans |  | 2,485,110,000 |  | 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 |  |  |  | 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 |
Commercial Real Estate Owner Occupied [Member] | Greater than 89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 2,639,000 |  | 3,383,000 |
Commercial Real Estate Owner Occupied [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  |  |  | 2,127,979,000 |
Commercial Real Estate Non-owner Occupied [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 0 |
Nonaccrual |  | 18,000 | [2],[3] | 0 |
Loans Not Past Due |  | 4,399,838,000 |  |  |
Nonaccrual with No Allowance for Credit Losses |  | 18,000 |  | 0 |
Loans Past Due Over 89 Days Still Accruing |  |  |  | 0 |
Total loans |  | 4,399,838,000 |  | 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 |
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 |
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 |
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 |  |  |  | 3,657,930,000 |
Construction Speculative [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 | [4] | 0 |
Nonaccrual |  | 0 | [5] | 0 | [1],[4]
Loans Not Past Due | [4] | 67,436,000 |  |  |
Nonaccrual with No Allowance for Credit Losses |  |  |  | 0 |
Loans Past Due Over 89 Days Still Accruing |  |  |  | 0 |
Total loans | [4] | 67,436,000 |  | 44,859,000 |
Construction Speculative [Member] | 30-59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 | [4] | 0 |
Construction Speculative [Member] | 60-89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 | [4] | 0 |
Construction Speculative [Member] | Greater than 89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 | [4] | 0 |
Construction Speculative [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due | [4] |  |  | 44,859,000 |
Construction Non-speculative [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 0 |
Nonaccrual |  |  |  | 0 |
Loans Not Past Due |  | 20,835,000 |  |  |
Nonaccrual with No Allowance for Credit Losses |  |  |  | 0 |
Loans Past Due Over 89 Days Still Accruing |  |  |  | 0 |
Total loans |  | 20,835,000 |  | 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 |
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 |
Construction Non-speculative [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  |  |  | 17,405,000 |
Small Business Administration [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 999,000 |  | 1,901,000 |
Nonaccrual |  | 443,000 | [2],[3] | 1,034,000 | [1]
Loans Not Past Due |  | 289,909,000 |  |  |
Nonaccrual with No Allowance for Credit Losses |  | 268,000 |  | 521,000 |
Loans Past Due Over 89 Days Still Accruing |  |  |  | 0 |
Total loans |  | 290,908,000 |  | 288,600,000 |
Small Business Administration [Member] | 30-59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 374,000 |  | 417,000 |
Small Business Administration [Member] | 60-89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 182,000 |  | 1,145,000 |
Small Business Administration [Member] | Greater than 89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 443,000 |  | 339,000 |
Small Business Administration [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  |  |  | 286,699,000 |
SBA - Paycheck Protection Program (PPP) [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 0 |
Nonaccrual |  |  |  | 0 |
Loans Not Past Due |  | 9,087,000 |  | 186,585,000 |
Nonaccrual with No Allowance for Credit Losses |  |  |  | 0 |
Loans Past Due Over 89 Days Still Accruing |  |  |  | 0 |
Total loans |  | 9,087,000 |  | 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 |
SBA - Paycheck Protection Program (PPP) [Member] | 60-89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 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 |
SBA - Paycheck Protection Program (PPP) [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  |  |  | 186,585,000 |
Commercial and Industrial [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 1,318,000 |  | 1,372,000 |
Nonaccrual |  | 1,320,000 | [2],[3] | 1,714,000 | [1]
Loans Not Past Due |  | 947,365,000 |  |  |
Nonaccrual with No Allowance for Credit Losses |  | 771,000 |  | 1,326,000 |
Loans Past Due Over 89 Days Still Accruing |  |  |  | 0 |
Total loans |  | 948,683,000 |  | 813,063,000 |
Commercial and Industrial [Member] | 30-59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 0 |
Commercial and Industrial [Member] | 60-89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 16,000 |
Commercial and Industrial [Member] | Greater than 89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 1,318,000 |  | 1,356,000 |
Commercial and Industrial [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  |  |  | 811,691,000 |
Dairy & Livestock and Agribusiness [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 269,000 |  | 0 |
Nonaccrual | [2],[3] | 477,000 |  |  |
Loans Not Past Due |  | 433,295,000 |  |  |
Nonaccrual with No Allowance for Credit Losses |  | 364,000 |  | 0 |
Loans Past Due Over 89 Days Still Accruing |  |  |  | 0 |
Total loans |  | 433,564,000 |  | 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 |
Dairy & Livestock and Agribusiness [Member] | 60-89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 0 |
Dairy & Livestock and Agribusiness [Member] | Greater than 89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 269,000 |  | 0 |
Dairy & Livestock and Agribusiness [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  |  |  | 386,219,000 |
Municipal Lease Finance Receivables [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 0 |
Nonaccrual |  |  |  | 0 |
Loans Not Past Due |  | 81,126,000 |  | 45,933,000 |
Nonaccrual with No Allowance for Credit Losses |  |  |  | 0 |
Loans Past Due Over 89 Days Still Accruing |  |  |  | 0 |
Total loans |  | 81,126,000 |  | 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 |
Municipal Lease Finance Receivables [Member] | 60-89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 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 |
Municipal Lease Finance Receivables [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  |  |  | 45,933,000 |
SFR Mortgage [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 388,000 |  | 1,040,000 |
Nonaccrual |  |  |  | 380,000 | [1]
Loans Not Past Due |  | 265,636,000 |  |  |
Nonaccrual with No Allowance for Credit Losses |  |  |  | 380,000 |
Loans Past Due Over 89 Days Still Accruing |  |  |  | 0 |
Total loans |  | 266,024,000 |  | 240,654,000 |
SFR Mortgage [Member] | 30-59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 1,040,000 |
SFR Mortgage [Member] | 60-89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 388,000 |  | 0 |
SFR Mortgage [Member] | Greater than 89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 0 |
SFR Mortgage [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  |  |  | 239,614,000 |
Consumer and Other Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 208,000 |  | 42,000 |
Nonaccrual |  | 33,000 |  | 158,000 | [1]
Loans Not Past Due |  | 76,573,000 |  |  |
Nonaccrual with No Allowance for Credit Losses |  | 34,000 |  | 158,000 |
Loans Past Due Over 89 Days Still Accruing |  |  |  | 0 |
Total loans |  | 76,781,000 |  | 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 |  | 175,000 |  | 0 |
Consumer and Other Loans [Member] | 60-89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 0 |
Consumer and Other Loans [Member] | Greater than 89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | $ 33,000 |  | 42,000 |
Consumer and Other Loans [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  |  |  | $ 74,623,000 |
[1] | 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.
[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.

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