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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, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due $ 52,472,000 $ 8,913,000
Nonaccrual 21,913,000 [1],[2] 21,302,000 [3]
Nonaccrual with No Allowance for Credit Losses 21,774,000 5,131,000
Loans Past Due Over 89 Days Still Accruing 0 0
Loan And Leases Receivable Gross Carrying Amount 8,572,565,000 8,904,910,000
30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 14,059,000 108,000
Nonaccrual 8,000,000 16,000,000,000
60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 24,788,000 547,000
Nonaccrual 60,000  
Greater than 89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 13,625,000 8,258,000
Nonaccrual 13,600,000 8,300,000
Financial Asset Not Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Not Past Due 8,520,093,000 8,895,997,000
Commercial Real Estate Owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 2,385,000 2,805,000
Nonaccrual 598,000 [1],[2] 2,505,000 [3]
Nonaccrual with No Allowance for Credit Losses 598,000 2,505,000
Loans Past Due Over 89 Days Still Accruing 0 0
Loan And Leases Receivable Gross Carrying Amount 2,364,384,000 2,433,252,000
Commercial Real Estate Owner Occupied [Member] | 30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 1,051,000 0
Commercial Real Estate Owner Occupied [Member] | 60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 736,000 300,000
Commercial Real Estate Owner Occupied [Member] | Greater than 89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 598,000 2,505,000
Commercial Real Estate Owner Occupied [Member] | Financial Asset Not Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Not Past Due 2,361,999,000 2,430,447,000
Commercial Real Estate Non-owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 47,110,000 547,000
Nonaccrual 18,196,000 [1],[2] 12,935,000 [3]
Nonaccrual with No Allowance for Credit Losses (18,196,000) (548,000)
Loans Past Due Over 89 Days Still Accruing 0 0
Loan And Leases Receivable Gross Carrying Amount 4,254,253,000 4,351,253,000
Commercial Real Estate Non-owner Occupied [Member] | 30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 12,899,000 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 23,928,000 16,000
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 10,283,000 531,000
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 4,207,143,000 4,350,706,000
Construction Speculative [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Nonaccrual 0 0
Nonaccrual with No Allowance for Credit Losses 0 0
Loans Past Due Over 89 Days Still Accruing 0 0
Loan And Leases Receivable Gross Carrying Amount 7,892,000 57,921,000
Construction Speculative [Member] | 30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Construction Speculative [Member] | 60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Construction Speculative [Member] | Greater than 89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Construction Speculative [Member] | Financial Asset Not Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Not Past Due 7,892,000 57,921,000
Construction Non-speculative [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Nonaccrual 0 0
Nonaccrual with No Allowance for Credit Losses 0 0
Loans Past Due Over 89 Days Still Accruing 0 0
Loan And Leases Receivable Gross Carrying Amount 6,863,000 8,813,000
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  
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 6,863,000 8,813,000
SBA [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 152,000 1,077,000
Nonaccrual 151,000 [1],[2] 969,000 [3]
Nonaccrual with No Allowance for Credit Losses 151,000 787,000
Loans Past Due Over 89 Days Still Accruing 0 0
Loan And Leases Receivable Gross Carrying Amount 272,001,000 270,619,000
SBA [Member] | 30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 109,000 108,000
SBA [Member] | 60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
SBA [Member] | Greater than 89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 43,000 969,000
SBA [Member] | Financial Asset Not Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Not Past Due 271,849,000 269,542,000
SBA - Paycheck Protection Program (PPP) [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Loans Not Past Due 1,255,000 2,736,000
Nonaccrual 0 0 [3]
Nonaccrual with No Allowance for Credit Losses 0 0
Loans Past Due Over 89 Days Still Accruing 0 0
Loan And Leases Receivable Gross Carrying Amount 1,255,000 2,736,000
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 64,000 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 1,255,000 2,736,000
Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 2,683,000 4,265,000
Nonaccrual 2,825,000 [1],[2] 4,509,000 [3]
Nonaccrual with No Allowance for Credit Losses 2,686,000 908,000
Loans Past Due Over 89 Days Still Accruing 0 0
Loan And Leases Receivable Gross Carrying Amount 342,445,000 969,895,000
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 12,000
Commercial and Industrial [Member] | Greater than 89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 2,619,000 4,253,000
Commercial and Industrial [Member] | Financial Asset Not Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Not Past Due 933,806,000 965,630,000
Dairy & Livestock and Agribusiness [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 142,000 0
Nonaccrual 143,000 [1],[2] 60,000 [3]
Nonaccrual with No Allowance for Credit Losses 143,000 60,000
Loans Past Due Over 89 Days Still Accruing 0 0
Loan And Leases Receivable Gross Carrying Amount 936,489,000 412,891,000
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 60,000 0
Dairy & Livestock and Agribusiness [Member] | Greater than 89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 82,000 0
Dairy & Livestock and Agribusiness [Member] | Financial Asset Not Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Not Past Due 342,303,000 412,891,000
Municipal Lease Finance Receivables [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Loans Not Past Due 67,585,000 73,590,000
Nonaccrual 0 0
Nonaccrual with No Allowance for Credit Losses 0 0
Loans Past Due Over 89 Days Still Accruing 0 0
Loan And Leases Receivable Gross Carrying Amount 67,585,000 73,590,000
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
Municipal Lease Finance Receivables [Member] | Financial Asset Not Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Not Past Due 67,585,000 73,590,000
SFR Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 201,000
Nonaccrual 0 324,000 [3]
Nonaccrual with No Allowance for Credit Losses 0 (323,000)
Loans Past Due Over 89 Days Still Accruing 0 0
Loan And Leases Receivable Gross Carrying Amount 267,181,000 269,868,000
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 0 201,000
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 267,181,000 269,667,000
Consumer and Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 18,000
Nonaccrual 0 0
Nonaccrual with No Allowance for Credit Losses 0 0
Loans Past Due Over 89 Days Still Accruing 0 0
Loan And Leases Receivable Gross Carrying Amount 52,217,000 54,072,000
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 18,000
Consumer and Other Loans [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] | Financial Asset Not Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Not Past Due $ 52,217,000 $ 54,054,000
[1] As of September 30, 2024, $206,000 of nonaccruing loans were current, $8.0 million were 30-59 days past due, $60,000 were 60-89 days past due, and $13.6 million were 90+ days past due.
[2] Excludes $165,000 of guaranteed portion of nonaccrual SBA loans that are in process of collection.
[3] 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.