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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
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.