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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
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment in Loans, Individually Evaluated for Impairment $ 14,457   $ 30,049
Recorded Investment in Loans, Collectively Evaluated for Impairment 4,760,366   4,535,872
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality 25,861   56,527
Allowance for Loan Losses, Individually Evaluated for Impairment 0   97
Allowance for Loan Losses, Collectively Evaluated for Impairment 59,623   58,390
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality 312   725
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 25,861 $ 28,882 56,527
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 312 $ 367 725
Commercial and Industrial [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment in Loans, Individually Evaluated for Impairment 432   1,150
Recorded Investment in Loans, Collectively Evaluated for Impairment 513,797   527,795
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality 0   0
Allowance for Loan Losses, Individually Evaluated for Impairment 0   88
Allowance for Loan Losses, Collectively Evaluated for Impairment 7,499   7,868
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 1,201   1,926
Recorded Investment in Loans, Collectively Evaluated for Impairment 122,231   110,764
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality 0   0
Allowance for Loan Losses, Individually Evaluated for Impairment 0   9
Allowance for Loan Losses, Collectively Evaluated for Impairment 884   862
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 7,992   20,216
Recorded Investment in Loans, Collectively Evaluated for Impairment 3,403,224   3,199,083
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 41,863   38,986
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   384
Recorded Investment in Loans, Collectively Evaluated for Impairment 79,898   72,398
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 987   820
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 3,576   4,248
Recorded Investment in Loans, Collectively Evaluated for Impairment 234,042   241,114
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 2,202   2,186
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 818   1,324
Recorded Investment in Loans, Collectively Evaluated for Impairment 275,561   242,940
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 4,666   5,842
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 67,892   62,416
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 834   889
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 438   801
Recorded Investment in Loans, Collectively Evaluated for Impairment 63,721   79,362
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 688   937
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality $ 0   $ 0