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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, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment $ 23,545 $ 15,525
Recorded Investment in Loans, Collectively Evaluated for Impairment 7,728,680 4,792,513
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality 17,214 28,882
Allowance for Loan Losses, Individually Evaluated for Impairment 561 75
Allowance for Loan Losses, Collectively Evaluated for Impairment 62,848 59,143
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality 204 367
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 17,214 28,882
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 204 367
Commercial and Industrial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment 7,625 440
Recorded Investment in Loans, Collectively Evaluated for Impairment 994,584 512,885
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality 0 0
Allowance for Loan Losses, Individually Evaluated for Impairment 3 0
Allowance for Loan Losses, Collectively Evaluated for Impairment 7,517 7,280
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 3,467 1,531
Recorded Investment in Loans, Collectively Evaluated for Impairment 346,576 120,524
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality 0 0
Allowance for Loan Losses, Individually Evaluated for Impairment 0 1
Allowance for Loan Losses, Collectively Evaluated for Impairment 1,062 868
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 6,540 8,133
Recorded Investment in Loans, Collectively Evaluated for Impairment 5,387,689 3,368,580
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality 0 0
Allowance for Loan Losses, Individually Evaluated for Impairment 478 0
Allowance for Loan Losses, Collectively Evaluated for Impairment 44,456 41,722
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 122,782 77,982
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 981 984
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 5,349 4,040
Recorded Investment in Loans, Collectively Evaluated for Impairment 291,155 232,162
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 2,196 2,112
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 78 829
Recorded Investment in Loans, Collectively Evaluated for Impairment 393,765 346,460
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality 0 0
Allowance for Loan Losses, Individually Evaluated for Impairment 12 0
Allowance for Loan Losses, Collectively Evaluated for Impairment 5,203 4,647
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 64,186 70,243
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 775 851
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 486 552
Recorded Investment in Loans, Collectively Evaluated for Impairment 127,943 63,677
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality 0 0
Allowance for Loan Losses, Individually Evaluated for Impairment 68 74
Allowance for Loan Losses, Collectively Evaluated for Impairment 658 679
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality $ 0 $ 0