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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
Sep. 30, 2019
Sep. 30, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment $ 9,780 $ 20,183
Recorded Investment in Loans, Collectively Evaluated for Impairment 7,488,537 7,550,280
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality   17,260
Allowance for Loan Losses, Individually Evaluated for Impairment 540 83
Allowance for Loan Losses, Collectively Evaluated for Impairment 68,132 59,719
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality   205
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   17,260
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   205
Commercial and Industrial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Recorded Investment in Loans, Individually Evaluated for Impairment 1,638 3,168
Recorded Investment in Loans, Collectively Evaluated for Impairment 920,040 1,018,738
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality   0
Allowance for Loan Losses, Individually Evaluated for Impairment 254 0
Allowance for Loan Losses, Collectively Evaluated for Impairment 7,984 7,491
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 3,248 3,593
Recorded Investment in Loans, Collectively Evaluated for Impairment 316,323 353,459
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality   0
Allowance for Loan Losses, Individually Evaluated for Impairment 286 0
Allowance for Loan Losses, Collectively Evaluated for Impairment 1,180 958
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 1,500 6,348
Recorded Investment in Loans, Collectively Evaluated for Impairment 5,374,168 5,262,392
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality   0
Allowance for Loan Losses, Individually Evaluated for Impairment 0 0
Allowance for Loan Losses, Collectively Evaluated for Impairment 48,911 41,541
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 0
Recorded Investment in Loans, Collectively Evaluated for Impairment 119,931 123,274
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality   0
Allowance for Loan Losses, Individually Evaluated for Impairment 0 0
Allowance for Loan Losses, Collectively Evaluated for Impairment 929 1,133
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 3,009 5,492
Recorded Investment in Loans, Collectively Evaluated for Impairment 275,635 287,024
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality   0
Allowance for Loan Losses, Individually Evaluated for Impairment 0 13
Allowance for Loan Losses, Collectively Evaluated for Impairment 2,375 2,112
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 0 775
Recorded Investment in Loans, Collectively Evaluated for Impairment 311,229 303,823
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality   0
Allowance for Loan Losses, Individually Evaluated for Impairment 0 0
Allowance for Loan Losses, Collectively Evaluated for Impairment 5,429 5,024
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 0
Recorded Investment in Loans, Collectively Evaluated for Impairment 54,468 67,581
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality   0
Allowance for Loan Losses, Individually Evaluated for Impairment 0 0
Allowance for Loan Losses, Collectively Evaluated for Impairment 662 815
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 385 807
Recorded Investment in Loans, Collectively Evaluated for Impairment 116,743 133,989
Recorded Investment in Loans, Acquired with Deterioriated Credit Quality   0
Allowance for Loan Losses, Individually Evaluated for Impairment 0 70
Allowance for Loan Losses, Collectively Evaluated for Impairment $ 662 645
Allowance for Loan Losses, Acquired with Deterioriated Credit Quality   $ 0