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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, 2020
Mar. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment   $ 20,290
Recorded Investment in Loans, Collectively Evaluated for Impairment   7,575,696
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality   15,356
Allowance for Loan Losses, Individually Evaluated for Impairment   435
Allowance for Loan Losses, Collectively Evaluated for Impairment   64,586
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality $ 82,600 180
PCI Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment   0
Recorded Investment in Loans, Collectively Evaluated for Impairment   0
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality   15,356
Allowance for Loan Losses, Individually Evaluated for Impairment   0
Allowance for Loan Losses, Collectively Evaluated for Impairment   0
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality   180
Commercial and Industrial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment   8,512
Recorded Investment in Loans, Collectively Evaluated for Impairment   948,614
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality   0
Allowance for Loan Losses, Individually Evaluated for Impairment   117
Allowance for Loan Losses, Collectively Evaluated for Impairment   7,482
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality   0
Small Business Administration [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment   4,661
Recorded Investment in Loans, Collectively Evaluated for Impairment   333,296
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality   0
Allowance for Loan Losses, Individually Evaluated for Impairment   317
Allowance for Loan Losses, Collectively Evaluated for Impairment   962
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality   0
Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment   1,589
Recorded Investment in Loans, Collectively Evaluated for Impairment   5,387,277
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality   0
Allowance for Loan Losses, Individually Evaluated for Impairment   0
Allowance for Loan Losses, Collectively Evaluated for Impairment   46,078
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality   0
Construction [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment   0
Recorded Investment in Loans, Collectively Evaluated for Impairment   121,912
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality   0
Allowance for Loan Losses, Individually Evaluated for Impairment   0
Allowance for Loan Losses, Collectively Evaluated for Impairment   864
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality   0
SFR Mortgage [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment   5,051
Recorded Investment in Loans, Collectively Evaluated for Impairment   280,736
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality   0
Allowance for Loan Losses, Individually Evaluated for Impairment   0
Allowance for Loan Losses, Collectively Evaluated for Impairment   2,188
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality   0
Dairy & Livestock and Agribusiness [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment   0
Recorded Investment in Loans, Collectively Evaluated for Impairment   322,321
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality   0
Allowance for Loan Losses, Individually Evaluated for Impairment   0
Allowance for Loan Losses, Collectively Evaluated for Impairment   5,699
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality   0
Municipal Lease Finance Receivables [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment   0
Recorded Investment in Loans, Collectively Evaluated for Impairment   61,249
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality   0
Allowance for Loan Losses, Individually Evaluated for Impairment   0
Allowance for Loan Losses, Collectively Evaluated for Impairment   738
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality   0
Consumer and Other Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment   477
Recorded Investment in Loans, Collectively Evaluated for Impairment   120,291
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality   0
Allowance for Loan Losses, Individually Evaluated for Impairment   1
Allowance for Loan Losses, Collectively Evaluated for Impairment   575
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality   $ 0