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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 ($)
Mar. 31, 2019
Dec. 31, 2018
30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual $ 2,100 $ 33,000
60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual 0 57,000
Loans, Excluding PCI Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 1,195,000 5,290,000
Nonaccrual 16,991,000 19,951,000
Current 7,577,800,000 7,726,984,000
Total gross loans, excluding PCI loans 7,595,986,000 7,752,225,000
Loans, Excluding PCI Loans [Member] | 30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 1,162,000 4,431,000
Loans, Excluding PCI Loans [Member] | 60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 33,000 859,000
Loans, Excluding PCI Loans [Member] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 369,000 909,000
Nonaccrual 8,388,000 7,490,000
Current 948,369,000 993,810,000
Total gross loans, excluding PCI loans 957,126,000 1,002,209,000
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 339,000 820,000
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 30,000 89,000
Loans, Excluding PCI Loans [Member] | Small Business Administration [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 601,000 1,307,000
Nonaccrual 4,098,000 2,892,000
Current 333,258,000 345,844,000
Total gross loans, excluding PCI loans 337,957,000 350,043,000
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 601,000 1,172,000
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 0 135,000
Loans, Excluding PCI Loans [Member] | Commercial Real Estate Owner Occupied [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 0 2,789,000
Nonaccrual 519,000 589,000
Current 2,098,622,000 2,114,612,000
Total gross loans, excluding PCI loans 2,099,141,000 2,117,990,000
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 0 2,439,000
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 0 350,000
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 124,000 0
Nonaccrual 615,000 5,479,000
Current 3,288,986,000 3,270,760,000
Total gross loans, excluding PCI loans 3,289,725,000 3,276,239,000
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 124,000 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 120,801,000 118,233,000
Total gross loans, excluding PCI loans 120,801,000 118,233,000
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 1,111,000 4,549,000
Total gross loans, excluding PCI loans 1,111,000 4,549,000
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 0 285,000
Nonaccrual 2,894,000 2,937,000
Current 282,893,000 293,282,000
Total gross loans, excluding PCI loans 285,787,000 296,504,000
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 0 285,000
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 0 78,000
Current 322,321,000 393,765,000
Total gross loans, excluding PCI loans 322,321,000 393,843,000
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 61,249,000 64,186,000
Total gross loans, excluding PCI loans 61,249,000 64,186,000
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 101,000 0
Nonaccrual 477,000 486,000
Current 120,190,000 127,943,000
Total gross loans, excluding PCI loans 120,768,000 128,429,000
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 98,000 0
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 $ 3,000 $ 0