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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 | Mar. 31, 2023 | Dec. 31, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | $ 7,132 |  | $ 5,821 |
Loans Not Past Due |  | 8,935,357 |  |  |
Nonaccrual |  | 6,175 | [1] | 4,930 | [2],[3]
Nonaccrual with No Allowance for Credit Losses |  | (4,358) |  | 4,094 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total loans |  | 8,942,489 |  | 9,079,392 |
Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  |  |  | 9,073,571 |
30-59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 1,000 |  | 570 |
60-89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 183 |  | 549 |
Nonaccrual |  | 6,000 |  |  |
Greater than 89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 5,949 |  | 4,702 |
Nonaccrual |  |  |  | 4,700 |
Commercial Real Estate Owner Occupied [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 3,040 |  | 2,639 |
Loans Not Past Due |  | 2,504,636 |  |  |
Nonaccrual |  | 2,616 | [1] | 2,639 | [2],[3]
Nonaccrual with No Allowance for Credit Losses |  | 2,616 |  | 2,639 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total loans |  | 2,507,676 |  | 2,485,110 |
Commercial Real Estate Owner Occupied [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  |  |  | 2,482,471 |
Commercial Real Estate Owner Occupied [Member] | 30-59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 425 |  | 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 |  | 2,615 |  | 2,639 |
Commercial Real Estate Non-owner Occupied [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 0 |
Loans Not Past Due |  | 4,442,626 |  |  |
Nonaccrual |  | 18 | [1] | 18 | [2],[3]
Nonaccrual with No Allowance for Credit Losses |  | (18) |  | (18) |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total loans |  | 4,442,626 |  | 4,399,838 |
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 |  |  |  | 4,399,838 |
Commercial Real Estate Non-owner Occupied [Member] | 30-59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 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 |  | 0 |  | 0 | [4]
Loans Not Past Due |  | 65,068 |  |  |
Nonaccrual |  | 0 | [1] | 0 | [2],[3],[5]
Nonaccrual with No Allowance for Credit Losses | [5] | 0 |  | 0 |
Loans Past Due Over 89 Days Still Accruing | [5] | 0 |  | 0 |
Total loans |  | 65,068 |  | 67,436 | [4]
Construction Speculative [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due | [4] |  |  | 67,436 |
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 Non-speculative [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 0 |
Loans Not Past Due |  | 18,924 |  |  |
Nonaccrual |  | 0 | [1],[4] | 0 | [2],[3]
Nonaccrual with No Allowance for Credit Losses |  | 0 |  | 0 |
Loans Past Due Over 89 Days Still Accruing |  | 0 | [4] | 0 |
Total loans |  | 18,924 |  | 20,835 |
Construction Non-speculative [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  |  |  | 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 |
Small Business Administration [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 1,277 |  | 999 |
Loans Not Past Due |  | 282,187 |  |  |
Nonaccrual |  | 702 | [1] | 443 | [2],[3]
Nonaccrual with No Allowance for Credit Losses |  | (364) |  | 268 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total loans |  | 283,464 |  | 290,908 |
Small Business Administration [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  |  |  | 289,909 |
Small Business Administration [Member] | 30-59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 575 |  | 182 |
Small Business Administration [Member] | 60-89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 374 |
Small Business Administration [Member] | Greater than 89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 702 |  | 443 |
SBA - Paycheck Protection Program (PPP) [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 0 |
Loans Not Past Due |  | 5,824 |  | 9,087 |
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 |  | 5,824 |  | 9,087 |
SBA - Paycheck Protection Program (PPP) [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  |  |  | 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 |
Commercial and Industrial [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 2,050 |  | 1,318 |
Loans Not Past Due |  | 896,117 |  |  |
Nonaccrual |  | 2,049 | [1] | 1,320 | [2],[3]
Nonaccrual with No Allowance for Credit Losses |  | (683) |  | 771 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total loans |  | 898,167 |  | 948,683 |
Commercial and Industrial [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  |  |  | 947,365 |
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 |  | 0 |  | 0 |
Commercial and Industrial [Member] | Greater than 89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 2,050 |  | 1,318 |
Dairy & Livestock and Agribusiness [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 381 |  | 269 |
Loans Not Past Due |  | 307,439 |  |  |
Nonaccrual |  | 406 | [1] | 477 | [2],[3]
Nonaccrual with No Allowance for Credit Losses |  | (293) |  | (364) |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total loans |  | 307,820 |  | 433,564 |
Dairy & Livestock and Agribusiness [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  |  |  | 433,295 |
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 |  | 183 |  | 0 |
Dairy & Livestock and Agribusiness [Member] | Greater than 89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 198 |  | 269 |
Municipal Lease Finance Receivables [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 0 |
Loans Not Past Due |  | 79,552 |  | 81,126 |
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 |  | 79,552 |  | 81,126 |
Municipal Lease Finance Receivables [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  |  |  | 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 |
SFR Mortgage [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 384 |  | 388 |
Loans Not Past Due |  | 261,940 |  |  |
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 |  | 262,324 |  | 266,024 |
SFR Mortgage [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  |  |  | 265,636 |
SFR Mortgage [Member] | 30-59 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 0 |  | 388 |
SFR Mortgage [Member] | 60-89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 0 |
SFR Mortgage [Member] | Greater than 89 Days Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  | 384 |  | 0 |
Consumer and Other Loans [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Total Past Due |  |  |  | 208 |
Loans Not Past Due |  | 71,044 |  |  |
Nonaccrual |  | 384 | [1] | 33 | [2],[3]
Nonaccrual with No Allowance for Credit Losses |  | (384) |  | 34 |
Loans Past Due Over 89 Days Still Accruing |  | 0 |  | 0 |
Total loans |  | 71,044 |  | 76,781 |
Consumer and Other Loans [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans Not Past Due |  |  |  | 76,573 |
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 |  | 175 |
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 |
[1] | There were no guaranteed portion of nonaccrual SBA loans that are in process of collection.
[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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