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Loans and Leases Receivable and Allowance for Loan and Lease Losses - Summary of Loans Modified in Troubled Debt Restructurings and Related Recorded Investment (Detail)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Loan
Jun. 30, 2018
USD ($)
Loan
Jun. 30, 2019
USD ($)
Loan
Jun. 30, 2018
USD ($)
Loan
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of loans | Loan 2 16 14 25
Recorded investment | $ $ 47 $ 663 $ 946 $ 985
Number of Loans | Loan     4 0
Recorded Investment | $     $ 108 $ 0
Commercial and industrial (including owner occupied commercial real estate)        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of loans | Loan 0 0 1 0
Recorded investment | $ $ 0 $ 0 $ 431 $ 0
Number of Loans | Loan     1 0
Recorded Investment | $     $ 0 $ 0
Manufactured housing        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of loans | Loan 2 14 12 23
Recorded investment | $ $ 47 $ 450 $ 432 $ 772
Number of Loans | Loan     3 0
Recorded Investment | $     $ 108 $ 0
Residential real estate        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of loans | Loan 0 1 1 1
Recorded investment | $ $ 0 $ 200 $ 83 $ 200
Other consumer        
Financing Receivable, Troubled Debt Restructuring [Line Items]        
Number of loans | Loan 0 1 0 1
Recorded investment | $ $ 0 $ 13 $ 0 $ 13