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Note Allowance for loan losses (T D R that subsequently defaulted) (Detail)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
loans
Jun. 30, 2016
USD ($)
loans
Jun. 30, 2017
USD ($)
loans
Jun. 30, 2016
USD ($)
loans
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Loan count | loans 119 153 204 335
Recorded investment as of first default date | $ $ 5,810 $ 6,928 $ 11,588 $ 14,918
CRE non-owner occupied        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Loan count | loans 1 0 2 2
Recorded investment as of first default date | $ $ 195 $ 0 $ 457 $ 327
CRE owner occupied        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Loan count | loans 2 1 3 7
Recorded investment as of first default date | $ $ 1,483 $ 47 $ 1,749 $ 2,503
Commercial and industrial        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Loan count | loans 1 2 3 2
Recorded investment as of first default date | $ $ 21 $ 27 $ 565 $ 27
Mortgages        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Loan count | loans 30 55 62 82
Recorded investment as of first default date | $ $ 2,542 $ 5,501 $ 5,896 $ 8,734
Leasing        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Loan count | loans   1   5
Recorded investment as of first default date | $   $ 32   $ 63
Credit cards        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Loan count | loans 27 56 46 171
Recorded investment as of first default date | $ $ 349 $ 594 $ 648 $ 1,758
Home equity lines of credit        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Loan count | loans 1   2  
Recorded investment as of first default date | $ $ 97   $ 140  
Personal        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Loan count | loans 55 37 82 64
Recorded investment as of first default date | $ $ 1,095 $ 711 $ 2,070 $ 1,473
Auto        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Loan count | loans 1 1 3 2
Recorded investment as of first default date | $ $ 19 $ 16 $ 54 $ 33
Other        
Troubled Debt Restructuring, Debtor, Current Period [Line Items]        
Loan count | loans 1   1  
Recorded investment as of first default date | $ $ 9   $ 9