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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
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment in Loans, Individually Evaluated for Impairment $ 28,796   $ 37,764
Recorded Investment in Loans, Collectively Evaluated for Impairment 4,616,131   4,134,444
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality 49,869   76,022
Allowance for Loan Losses, Individually Evaluated for Impairment 113   630
Allowance for Loan Losses, Collectively Evaluated for Impairment 59,429   59,998
Allowance for Loan Losses, Acquired with Deteriorated Credit Quality 659   310
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 Deteriorated Credit Quality 49,869 $ 71,585 76,022
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 Deteriorated Credit Quality 659 $ 1,219 310
Commercial and Industrial [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment in Loans, Individually Evaluated for Impairment 1,605   1,447
Recorded Investment in Loans, Collectively Evaluated for Impairment 535,742   477,686
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality 0   0
Allowance for Loan Losses, Individually Evaluated for Impairment 13   526
Allowance for Loan Losses, Collectively Evaluated for Impairment 8,047   8,861
Allowance for Loan Losses, Acquired with Deteriorated Credit Quality 0   0
Small Business Administration [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment in Loans, Individually Evaluated for Impairment 2,478   3,498
Recorded Investment in Loans, Collectively Evaluated for Impairment 126,805   108,264
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality 0   0
Allowance for Loan Losses, Individually Evaluated for Impairment 6   42
Allowance for Loan Losses, Collectively Evaluated for Impairment 907   1,135
Allowance for Loan Losses, Acquired with Deteriorated Credit Quality 0   0
Commercial Real Estate [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment in Loans, Individually Evaluated for Impairment 18,558   17,908
Recorded Investment in Loans, Collectively Evaluated for Impairment 3,247,300   2,866,424
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality 0   0
Allowance for Loan Losses, Individually Evaluated for Impairment 0   1
Allowance for Loan Losses, Collectively Evaluated for Impairment 39,927   39,918
Allowance for Loan Losses, Acquired with Deteriorated Credit Quality 0   0
Construction [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment in Loans, Individually Evaluated for Impairment 0   7,651
Recorded Investment in Loans, Collectively Evaluated for Impairment 77,294   86,358
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality 0   0
Allowance for Loan Losses, Individually Evaluated for Impairment 0   45
Allowance for Loan Losses, Collectively Evaluated for Impairment 1,059   1,183
Allowance for Loan Losses, Acquired with Deteriorated Credit Quality 0   0
SFR Mortgage [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment in Loans, Individually Evaluated for Impairment 4,195   5,734
Recorded Investment in Loans, Collectively Evaluated for Impairment 245,738   231,754
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality 0   0
Allowance for Loan Losses, Individually Evaluated for Impairment 0   13
Allowance for Loan Losses, Collectively Evaluated for Impairment 2,369   2,488
Allowance for Loan Losses, Acquired with Deteriorated 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   697
Recorded Investment in Loans, Collectively Evaluated for Impairment 244,426   213,133
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality 0   0
Allowance for Loan Losses, Individually Evaluated for Impairment 0   0
Allowance for Loan Losses, Collectively Evaluated for Impairment 5,440   4,882
Allowance for Loan Losses, Acquired with Deteriorated 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 66,048   71,929
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality 0   0
Allowance for Loan Losses, Individually Evaluated for Impairment 0   0
Allowance for Loan Losses, Collectively Evaluated for Impairment 852   1,115
Allowance for Loan Losses, Acquired with Deteriorated 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 1,131   829
Recorded Investment in Loans, Collectively Evaluated for Impairment 72,778   78,896
Recorded Investment in Loans, Acquired with Deteriorated Credit Quality 0   0
Allowance for Loan Losses, Individually Evaluated for Impairment 94   3
Allowance for Loan Losses, Collectively Evaluated for Impairment 828   416
Allowance for Loan Losses, Acquired with Deteriorated Credit Quality $ 0   $ 0