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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 ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual $ 431  
60-89 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual   $ 376
Dairy & Livestock and Agribusiness [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Nonaccrual 818  
Loans, Excluding PCI Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 743 1,172
Nonaccrual 10,172 10,716
Current 4,763,908 4,796,150
Total gross loans, excluding PCI loans 4,774,823 4,808,038
Loans, Excluding PCI Loans [Member] | 30-59 Days Past Due [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 743 1,172
Loans, Excluding PCI Loans [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] | Commercial and Industrial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 0 768
Nonaccrual 272 250
Current 513,957 512,307
Total gross loans, excluding PCI loans 514,229 513,325
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 0 768
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 0 0
Loans, Excluding PCI Loans [Member] | Small Business Administration [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Past Due and Accruing 0 403
Nonaccrual 589 906
Current 122,843 120,746
Total gross loans, excluding PCI loans 123,432 122,055
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 0 403
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 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 0 0
Nonaccrual 4,332 4,365
Current 1,091,398 1,091,915
Total gross loans, excluding PCI loans 1,095,730 1,096,280
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 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 0 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 2,414 2,477
Current 2,313,072 2,277,956
Total gross loans, excluding PCI loans 2,315,486 2,280,433
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 63,544 60,042
Total gross loans, excluding PCI loans 63,544 60,042
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 16,354 17,940
Total gross loans, excluding PCI loans 16,354 17,940
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 680 0
Nonaccrual 1,309 1,337
Current 235,629 234,865
Total gross loans, excluding PCI loans 237,618 236,202
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 680 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 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 818 829
Current 275,561 346,460
Total gross loans, excluding PCI loans 276,379 347,289
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 67,892 70,243
Total gross loans, excluding PCI loans 67,892 70,243
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 63 1
Nonaccrual 438 552
Current 63,658 63,676
Total gross loans, excluding PCI loans 64,159 64,229
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 63 1
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