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Loans and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Recorded Investment in Loans Held-for-Investment and Related Allowance for Loan Losses by Loan Type (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment $ 15,525 $ 26,385
Recorded Investment in Loans, Collectively Evaluated for Impairment 4,792,513 4,304,046
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality 28,882 71,585
Allowance for Loan Losses, Individually Evaluated for Impairment 75 141
Allowance for Loan Losses, Collectively Evaluated for Impairment 59,143 60,180
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality 367 1,219
PCI Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment 0 0
Recorded Investment in Loans, Collectively Evaluated for Impairment 0 0
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality 28,882 71,585
Allowance for Loan Losses, Individually Evaluated for Impairment 0 0
Allowance for Loan Losses, Collectively Evaluated for Impairment 0 0
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality 367 1,219
Commercial and Industrial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment 440 901
Recorded Investment in Loans, Collectively Evaluated for Impairment 512,885 484,177
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality 0 0
Allowance for Loan Losses, Individually Evaluated for Impairment 0 114
Allowance for Loan Losses, Collectively Evaluated for Impairment 7,280 8,040
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality 0 0
Small Business Administration [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment 1,531 3,582
Recorded Investment in Loans, Collectively Evaluated for Impairment 120,524 93,602
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality 0 0
Allowance for Loan Losses, Individually Evaluated for Impairment 1 27
Allowance for Loan Losses, Collectively Evaluated for Impairment 868 844
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality 0 0
Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment 8,133 15,128
Recorded Investment in Loans, Collectively Evaluated for Impairment 3,368,580 2,915,013
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality 0 0
Allowance for Loan Losses, Individually Evaluated for Impairment 0 0
Allowance for Loan Losses, Collectively Evaluated for Impairment 41,722 37,443
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality 0 0
Construction [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment 0 0
Recorded Investment in Loans, Collectively Evaluated for Impairment 77,982 85,879
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality 0 0
Allowance for Loan Losses, Individually Evaluated for Impairment 0 0
Allowance for Loan Losses, Collectively Evaluated for Impairment 984 1,096
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality 0 0
SFR Mortgage [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment 4,040 5,174
Recorded Investment in Loans, Collectively Evaluated for Impairment 232,162 245,431
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality 0 0
Allowance for Loan Losses, Individually Evaluated for Impairment 0 0
Allowance for Loan Losses, Collectively Evaluated for Impairment 2,112 2,287
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality 0 0
Dairy & Livestock and Agribusiness [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment 829 747
Recorded Investment in Loans, Collectively Evaluated for Impairment 346,460 337,884
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality 0 0
Allowance for Loan Losses, Individually Evaluated for Impairment 0 0
Allowance for Loan Losses, Collectively Evaluated for Impairment 4,647 8,541
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality 0 0
Municipal Lease Finance Receivables [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment 0 0
Recorded Investment in Loans, Collectively Evaluated for Impairment 70,243 64,639
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality 0 0
Allowance for Loan Losses, Individually Evaluated for Impairment 0 0
Allowance for Loan Losses, Collectively Evaluated for Impairment 851 941
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality 0 0
Consumer and Other Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment 552 853
Recorded Investment in Loans, Collectively Evaluated for Impairment 63,677 77,421
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality 0 0
Allowance for Loan Losses, Individually Evaluated for Impairment 74 0
Allowance for Loan Losses, Collectively Evaluated for Impairment 679 988
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality $ 0 $ 0