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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, 2023
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due $ 9,357,000 $ 5,821,000
Nonaccrual 9,963,000 [1] 4,930,000 [2],[3]
Nonaccrual with No Allowance for Credit Losses (5,932,000) 4,094,000
Loans Past Due Over 89 Days Still Accruing 0 0
Total gross loans 8,877,632,000 9,079,392,000
30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 96,000 549,000
Nonaccrual 4,000  
60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 2,680,000 570,000
Greater than 89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 6,581,000 4,702,000
Nonaccrual 6,600,000 4,700,000
Financial Asset Not Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Not Past Due 8,868,275,000 9,073,571,000
Commercial Real Estate Owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 3,243,000 2,639,000
Nonaccrual 3,107,000 [1] 2,639,000 [2],[3]
Nonaccrual with No Allowance for Credit Losses (3,107,000) 2,639,000
Loans Past Due Over 89 Days Still Accruing 0 0
Total gross loans 2,471,720,000 2,485,110,000
Commercial Real Estate Owner Occupied [Member] | 30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 92,000 0
Commercial Real Estate Owner Occupied [Member] | 60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 44,000 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 3,107,000 2,639,000
Commercial Real Estate Owner Occupied [Member] | Financial Asset Not Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Not Past Due 2,468,477,000 2,482,471,000
Commercial Real Estate Non-owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 531,000 0
Nonaccrual 548,000 [1] 18,000 [2],[3]
Nonaccrual with No Allowance for Credit Losses (548,000) (18,000)
Loans Past Due Over 89 Days Still Accruing 0 0
Total gross loans 4,371,339,000 4,399,838,000
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 531,000 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 4,370,808,000 4,399,838,000
Construction Speculative [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 [4] 0 [5]
Nonaccrual 0 [1],[6] 0 [2],[3],[7]
Nonaccrual with No Allowance for Credit Losses 0 [6] 0 [7]
Loans Past Due Over 89 Days Still Accruing 0 [6] 0 [7]
Total gross loans 53,058,000 [4] 67,436,000 [5]
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 53,058,000 [4] 67,436,000 [5]
Construction Non-speculative [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Nonaccrual 0 [1] 0 [2],[3]
Nonaccrual with No Allowance for Credit Losses 0
Loans Past Due Over 89 Days Still Accruing 0 0
Total gross loans 9,964,000 20,835,000
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 9,964,000 20,835,000
SBA [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 1,050,000 999,000
Nonaccrual 1,050,000 [1] 443,000 [2],[3]
Nonaccrual with No Allowance for Credit Losses (868,000) 268,000
Loans Past Due Over 89 Days Still Accruing 0 0
Total gross loans 283,124,000 290,908,000
SBA [Member] | 30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 374,000
SBA [Member] | 60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 54,000 182,000
SBA [Member] | Greater than 89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 996,000 443,000
SBA [Member] | Financial Asset Not Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Not Past Due 282,074,000 289,909,000
SBA - Paycheck Protection Program (PPP) [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Loans Not Past Due 3,233,000 9,087,000
Nonaccrual 0 [1] 0 [2],[3]
Nonaccrual with No Allowance for Credit Losses 0
Loans Past Due Over 89 Days Still Accruing 0 0
Total gross loans 3,233,000 9,087,000
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
SBA - Paycheck Protection Program (PPP) [Member] | Financial Asset Not Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Not Past Due 3,233,000 9,087,000
Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 4,398,000 1,318,000
Nonaccrual 4,672,000 [1] 1,320,000 [2],[3]
Nonaccrual with No Allowance for Credit Losses (939,000) 771,000
Loans Past Due Over 89 Days Still Accruing 0 0
Total gross loans 938,064,000 948,683,000
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 2,487,000 0
Commercial and Industrial [Member] | Greater than 89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 1,911,000 1,318,000
Commercial and Industrial [Member] | Financial Asset Not Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Not Past Due 933,666,000 947,365,000
Dairy & Livestock and Agribusiness [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 131,000 0
Nonaccrual 243,000 [1] 477,000 [2],[3]
Nonaccrual with No Allowance for Credit Losses (131,000) 364,000
Loans Past Due Over 89 Days Still Accruing 0 0
Total gross loans 351,463,000 433,564,000
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 95,000 0
Dairy & Livestock and Agribusiness [Member] | Greater than 89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 36,000 269,000
Dairy & Livestock and Agribusiness [Member] | Financial Asset Not Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Not Past Due 351,332,000 433,295,000
Municipal Lease Finance Receivables [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Loans Not Past Due 75,621,000 81,126,000
Nonaccrual 0 [1] 0 [2],[3]
Nonaccrual with No Allowance for Credit Losses 0
Loans Past Due Over 89 Days Still Accruing 0 0
Total gross loans 75,621,000 81,126,000
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 75,621,000 81,126,000
SFR Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 388,000
Nonaccrual 339,000 [1] 0 [2],[3]
Nonaccrual with No Allowance for Credit Losses (339,000) 0
Loans Past Due Over 89 Days Still Accruing 0 0
Total gross loans 268,171,000 266,024,000
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 0 388,000
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 268,171,000 265,636,000
Consumer and Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 4,000 208,000
Nonaccrual 4,000 [1] 33,000 [2],[3]
Nonaccrual with No Allowance for Credit Losses 34,000
Loans Past Due Over 89 Days Still Accruing 0 0
Total gross loans 51,875,000 76,781,000
Consumer and Other Loans [Member] | 30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 4,000 175,000
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 33,000
Consumer and Other Loans [Member] | Financial Asset Not Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans Not Past Due $ 51,871,000 $ 76,573,000
[1] As of September 30, 2023, $742,000 of nonaccruing loans were current, $4,000 were 30-59 days past due, $2.6 million were 60-89 days past due, and $6.6 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.