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Note Allowance for loan losses (T D R that subsequently defaulted) (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
loans
Sep. 30, 2017
USD ($)
loans
Sep. 30, 2018
USD ($)
loans
Sep. 30, 2017
USD ($)
loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Loan count | loans 159 252 309 538
Recorded investment as of first default date | $ $ 6,756 $ 6,705 $ 14,200 $ 19,015
CRE non-owner occupied        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Loan count | loans 0 0 1 2
Recorded investment as of first default date | $ $ 0 $ 0 $ 17 $ 457
CRE owner occupied        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Loan count | loans 1 0 4 3
Recorded investment as of first default date | $ $ 255 $ 0 $ 392 $ 1,749
Commercial and industrial        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Loan count | loans 1 1 7 4
Recorded investment as of first default date | $ $ 5 $ 36 $ 81 $ 601
Mortgages        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Loan count | loans 42 48 74 110
Recorded investment as of first default date | $ $ 5,280 $ 4,216 $ 9,520 $ 10,112
Credit cards        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Loan count | loans 86 135 150 274
Recorded investment as of first default date | $ $ 707 $ 1,212 $ 2,301 $ 2,661
Home equity lines of credit        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Loan count | loans 1 0 1 1
Recorded investment as of first default date | $ $ 144 $ 0 $ 144 $ 97
Personal        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Loan count | loans 27 67 67 138
Recorded investment as of first default date | $ $ 362 $ 1,222 $ 1,656 $ 3,230
Auto Loan        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Loan count | loans 0 1 3 5
Recorded investment as of first default date | $ $ 0 $ 19 $ 79 $ 99
Other        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Loan count | loans 1 0 2 1
Recorded investment as of first default date | $ $ 3 $ 0 $ 10 $ 9