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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
Sep. 30, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due $ 27,184 $ 26,842
Current 8,470,906 8,536,432
Total Loans and Financing Receivables 8,470,906 8,536,432
Nonaccrual with No Allowance for Credit Losses 27,779 27,273
Total Nonaccrual 27,804 [1],[2] 27,795 [3]
Loans Past Due Over 89 Days Still Accruing 0 0
30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 42 399
Total Nonaccrual   102,000
60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 43 190
Greater than 89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 27,099 26,253
Total Nonaccrual 27,100 26,300
Financial Asset Not Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 8,443,722 8,509,590
Commercial Real Estate Owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 43 196
Total Loans and Financing Receivables 2,284,244 2,329,576
Nonaccrual with No Allowance for Credit Losses 0 1,436
Total Nonaccrual 0 [1],[2] 1,436 [3]
Loans Past Due Over 89 Days Still Accruing 0 0
Commercial Real Estate 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 Owner Occupied [Member] | 60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 43 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 0 196
Commercial Real Estate Owner Occupied [Member] | Financial Asset Not Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 2,284,201 2,329,380
Commercial Real Estate Non-owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 23,707 24,430
Total Loans and Financing Receivables 4,251,075 4,177,876
Nonaccrual with No Allowance for Credit Losses 23,707 24,430
Total Nonaccrual 23,707 [1],[2] 24,430 [3]
Loans Past Due Over 89 Days Still Accruing 0 0
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 23,707 24,430
Commercial Real Estate Non-owner Occupied [Member] | Financial Asset Not Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 4,227,368 4,153,446
Construction Speculative [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 [4] 0 [5]
Total Loans and Financing Receivables 10,517 [4] 8,091 [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]    
Current 10,517 [4] 8,091 [5]
Construction Non-speculative [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Total Loans and Financing Receivables 19,459 7,991
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
Construction Non-speculative [Member] | Financial Asset Not Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 19,459 7,991
SBA [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 3,432 1,617
Total Loans and Financing Receivables 266,228 273,013
Nonaccrual with No Allowance for Credit Losses 3,927 1,146
Total Nonaccrual 3,952 [1],[2] 1,529 [3]
Loans Past Due Over 89 Days Still Accruing 0 0
SBA [Member] | 30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 42 0
SBA [Member] | 60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 190
SBA [Member] | Greater than 89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 3,390 1,427
SBA [Member] | Financial Asset Not Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 262,796 271,396
SBA - Paycheck Protection Program (PPP) [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Current 51 774
Total Loans and Financing Receivables 51 774
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]    
Current 51 774
Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 2 539
Total Loans and Financing Receivables 939,174 925,178
Nonaccrual with No Allowance for Credit Losses 145 201
Total Nonaccrual 145 [1],[2] 340 [3]
Loans Past Due Over 89 Days Still Accruing 0 0
Commercial and Industrial [Member] | 30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 399
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 2 140
Commercial and Industrial [Member] | Financial Asset Not Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 939,172 924,639
Dairy & Livestock and Agribusiness [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 60
Total Loans and Financing Receivables 292,963 419,904
Nonaccrual with No Allowance for Credit Losses   60
Total Nonaccrual [3]   60
Loans Past Due Over 89 Days Still Accruing   0
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 0 60
Dairy & Livestock and Agribusiness [Member] | Financial Asset Not Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current 292,963 419,844
Municipal Lease Finance Receivables [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Current 61,383 66,114
Total Loans and Financing Receivables 61,383 66,114
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]    
Current 61,383 66,114
SFR Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Total Loans and Financing Receivables 286,111 269,172
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 0
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]    
Current 286,111 269,172
Consumer and Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due 0 0
Total Loans and Financing Receivables 59,701 58,743
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 0 0
Consumer and Other Loans [Member] | Financial Asset Not Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current $ 59,701 $ 58,743
[1] As of September 30, 2025, $705,000 of nonaccruing loans were current, $27.1 million were 90+ days past due.
[2] Excludes $272,000 of guaranteed portion of nonaccrual SBA loans that are in process of collection.
[3] As of December 31, 2024, $1.4 million of nonaccruing loans were current, $102,000 were 60-89 days past due, and $26.3 million were 90+ days past due.
[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.