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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, 2019
Dec. 31, 2018
Mar. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment in Loans, Individually Evaluated for Impairment $ 20,290   $ 14,457
Recorded Investment in Loans, Collectively Evaluated for Impairment 7,575,696   4,760,366
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality 15,356   25,861
Allowance for Loan Losses, Individually Evaluated for Impairment 435   0
Allowance for Loan Losses, Collectively Evaluated for Impairment 64,586   59,623
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality 180   312
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 15,356 $ 17,214 25,861
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 180 $ 204 312
Commercial and Industrial [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment in Loans, Individually Evaluated for Impairment 8,512   432
Recorded Investment in Loans, Collectively Evaluated for Impairment 948,614   513,797
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality 0   0
Allowance for Loan Losses, Individually Evaluated for Impairment 117   0
Allowance for Loan Losses, Collectively Evaluated for Impairment 7,482   7,499
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 4,661   1,201
Recorded Investment in Loans, Collectively Evaluated for Impairment 333,296   122,231
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality 0   0
Allowance for Loan Losses, Individually Evaluated for Impairment 317   0
Allowance for Loan Losses, Collectively Evaluated for Impairment 962   884
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 1,589   7,992
Recorded Investment in Loans, Collectively Evaluated for Impairment 5,387,277   3,403,224
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 46,078   41,863
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 121,912   79,898
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 864   987
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 5,051   3,576
Recorded Investment in Loans, Collectively Evaluated for Impairment 280,736   234,042
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 2,188   2,202
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 0   818
Recorded Investment in Loans, Collectively Evaluated for Impairment 322,321   275,561
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 5,699   4,666
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 61,249   67,892
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 738   834
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 477   438
Recorded Investment in Loans, Collectively Evaluated for Impairment 120,291   63,721
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality 0   0
Allowance for Loan Losses, Individually Evaluated for Impairment 1   0
Allowance for Loan Losses, Collectively Evaluated for Impairment 575   688
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality $ 0   $ 0