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Loans and Leases Receivable and Allowance for Loan and Lease Losses - Summary of Loans and Leases Modified in Troubled Debt Restructurings and Recorded Investments (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Loan
Dec. 31, 2018
USD ($)
Loan
Dec. 31, 2017
USD ($)
Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of loans | Loan 28 41 40
Recorded investment | $ $ 1,437 $ 1,675 $ 8,071
Number of loans | Loan 4 4 5
Recorded investment | $ $ 154 $ 92 $ 211
Commercial and industrial (including owner occupied commercial real estate)      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of loans | Loan 1 0 4
Recorded investment | $ $ 431 $ 0 $ 6,437
Residential real estate      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of loans | Loan 1 2 0
Recorded investment | $ $ 83 $ 352 $ 0
Number of loans | Loan 3 4 5
Recorded investment | $ $ 73 $ 92 $ 211
Manufactured housing      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of loans | Loan 26 38 36
Recorded investment | $ $ 923 $ 1,310 $ 1,634
Number of loans | Loan 1 0 0
Recorded investment | $ $ 81 $ 0 $ 0
Other consumer      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of loans | Loan 0 1 0
Recorded investment | $ $ 0 $ 13 $ 0