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Loans and Lease Finance Receivables and Allowance for Credit Losses - Summary of Loans Modified as Troubled Debt Restructurings (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Agreement
Sep. 30, 2021
USD ($)
Agreement
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings, Number of Loans | Agreement 0 3
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment $ 0 $ 7,096
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment 0 7,096
Troubled debt restructurings, Outstanding Recorded Investment 0 6,739
Troubled debt restructurings, Financial Effect Resulting From Modifications $ 0 $ 0
Commercial Real Estate Owner Occupied [Member] | Interest rate reduction [Member]    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings, Number of Loans | Agreement 0 1
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment $ 0 $ 2,453
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment 0 2,453
Troubled debt restructurings, Outstanding Recorded Investment 0 2,446
Troubled debt restructurings, Financial Effect Resulting From Modifications $ 0 $ 0
Commercial Real Estate Owner Occupied [Member] | Change in Amortization Period [Member]    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings, Number of Loans | Agreement 0 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment $ 0 $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment 0 0
Troubled debt restructurings, Outstanding Recorded Investment 0 0
Troubled debt restructurings, Financial Effect Resulting From Modifications $ 0 $ 0
Commercial and Industrial Loans [Member] | Interest rate reduction [Member]    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings, Number of Loans | Agreement 0 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment $ 0 $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment 0 0
Troubled debt restructurings, Outstanding Recorded Investment 0 0
Troubled debt restructurings, Financial Effect Resulting From Modifications $ 0 $ 0
Commercial and Industrial Loans [Member] | Change in Amortization Period [Member]    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings, Number of Loans | Agreement 0 2
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment $ 0 $ 4,643
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment 0 4,643
Troubled debt restructurings, Outstanding Recorded Investment 0 4,293
Troubled debt restructurings, Financial Effect Resulting From Modifications $ 0 $ 0
SFR Mortgage [Member] | Interest rate reduction [Member]    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings, Number of Loans | Agreement 0 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment $ 0 $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment 0 0
Troubled debt restructurings, Outstanding Recorded Investment 0 0
Troubled debt restructurings, Financial Effect Resulting From Modifications $ 0 $ 0
SFR Mortgage [Member] | Change in Amortization Period [Member]    
Financing Receivable, Modifications [Line Items]    
Troubled debt restructurings, Number of Loans | Agreement 0 0
Troubled debt restructurings, Pre-Modification Outstanding Recorded Investment $ 0 $ 0
Troubled debt restructurings, Post-Modification Outstanding Recorded Investment 0 0
Troubled debt restructurings, Outstanding Recorded Investment 0 0
Troubled debt restructurings, Financial Effect Resulting From Modifications $ 0 $ 0