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Loans and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Recorded Investment in, and Aging of, Past Due and Nonaccrual Loans, Excluding PCI Loans by Class of Loans (Detail) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual $ 33,000  
60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual 57,000 $ 376,000
Dairy & Livestock and Agribusiness [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual 78,000  
Loans, Excluding PCI Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 5,290,000 1,172,000
Nonaccrual 19,951,000 10,716,000
Current 7,726,984,000 4,796,150,000
Total gross loans, excluding PCI loans 7,752,225,000 4,808,038,000
Loans, Excluding PCI Loans [Member] | 30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 4,431,000 1,172,000
Loans, Excluding PCI Loans [Member] | 60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 859,000 0
Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 909,000 768,000
Nonaccrual 7,490,000 250,000
Current 993,810,000 512,307,000
Total gross loans, excluding PCI loans 1,002,209,000 513,325,000
Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member] | 30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 820,000 768,000
Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member] | 60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 89,000 0
Loans, Excluding PCI Loans [Member] | Small Business Administration [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 1,307,000 403,000
Nonaccrual 2,892,000 906,000
Current 345,844,000 120,746,000
Total gross loans, excluding PCI loans 350,043,000 122,055,000
Loans, Excluding PCI Loans [Member] | Small Business Administration [Member] | 30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 1,172,000 403,000
Loans, Excluding PCI Loans [Member] | Small Business Administration [Member] | 60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 135,000 0
Loans, Excluding PCI Loans [Member] | Commercial Real Estate Owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 2,789,000 0
Nonaccrual 589,000 4,365,000
Current 2,114,612,000 1,091,915,000
Total gross loans, excluding PCI loans 2,117,990,000 1,096,280,000
Loans, Excluding PCI Loans [Member] | Commercial Real Estate Owner Occupied [Member] | 30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 2,439,000 0
Loans, Excluding PCI Loans [Member] | Commercial Real Estate Owner Occupied [Member] | 60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 350,000 0
Loans, Excluding PCI Loans [Member] | Commercial Real Estate Non-owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 0 0
Nonaccrual 5,479,000 2,477,000
Current 3,270,760,000 2,277,956,000
Total gross loans, excluding PCI loans 3,276,239,000 2,280,433,000
Loans, Excluding PCI Loans [Member] | Commercial Real Estate Non-owner Occupied [Member] | 30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 0 0
Loans, Excluding PCI Loans [Member] | Commercial Real Estate Non-owner Occupied [Member] | 60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 0 0
Loans, Excluding PCI Loans [Member] | Construction Speculative [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 0 0
Nonaccrual 0 0
Current 118,233,000 60,042,000
Total gross loans, excluding PCI loans 118,233,000 60,042,000
Loans, Excluding PCI Loans [Member] | Construction Speculative [Member] | 30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 0 0
Loans, Excluding PCI Loans [Member] | Construction Speculative [Member] | 60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 0 0
Loans, Excluding PCI Loans [Member] | Construction Non-speculative [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 0 0
Nonaccrual 0 0
Current 4,549,000 17,940,000
Total gross loans, excluding PCI loans 4,549,000 17,940,000
Loans, Excluding PCI Loans [Member] | Construction Non-speculative [Member] | 30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 0 0
Loans, Excluding PCI Loans [Member] | Construction Non-speculative [Member] | 60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 0 0
Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 285,000 0
Nonaccrual 2,937,000 1,337,000
Current 293,282,000 234,865,000
Total gross loans, excluding PCI loans 296,504,000 236,202,000
Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member] | 30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 0 0
Loans, Excluding PCI Loans [Member] | SFR Mortgage [Member] | 60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 285,000 0
Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 0 0
Nonaccrual 78,000 829,000
Current 393,765,000 346,460,000
Total gross loans, excluding PCI loans 393,843,000 347,289,000
Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member] | 30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 0 0
Loans, Excluding PCI Loans [Member] | Dairy & Livestock and Agribusiness [Member] | 60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 0 0
Loans, Excluding PCI Loans [Member] | Municipal Lease Finance Receivables [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 0 0
Nonaccrual 0 0
Current 64,186,000 70,243,000
Total gross loans, excluding PCI loans 64,186,000 70,243,000
Loans, Excluding PCI Loans [Member] | Municipal Lease Finance Receivables [Member] | 30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 0 0
Loans, Excluding PCI Loans [Member] | Municipal Lease Finance Receivables [Member] | 60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 0 0
Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 0 1,000
Nonaccrual 486,000 552,000
Current 127,943,000 63,676,000
Total gross loans, excluding PCI loans 128,429,000 64,229,000
Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member] | 30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 0 1,000
Loans, Excluding PCI Loans [Member] | Consumer and Other Loans [Member] | 60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing $ 0 $ 0