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Note Allowance for loan losses (Troubled debt restructurings loan count by type of modification) (Detail) - loans | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |  |  |
Reduction In Interest Rate | 659 | 352 | 1,673 | 1,206
Extension of Maturity Date | 61 | 35 | 192 | 98
Combination Interest Rate Reduction Maturity Date Extension | 76 | 93 | 192 | 320
Other Modifications | 84 | 132 | 439 | 545
Commercial multi-family |  |  |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |  |  |
Reduction In Interest Rate | 0 |  | 0 |
Extension of Maturity Date | 1 |  | 2 |
Combination Interest Rate Reduction Maturity Date Extension | 0 |  | 0 |
Other Modifications | 0 |  | 0 |
CRE non-owner occupied |  |  |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |  |  |
Reduction In Interest Rate | 1 | 0 | 3 | 4
Extension of Maturity Date | 3 | 0 | 14 | 1
Combination Interest Rate Reduction Maturity Date Extension | 0 | 0 | 0 | 0
Other Modifications | 0 | 0 | 0 | 0
CRE owner occupied |  |  |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |  |  |
Reduction In Interest Rate | 1 | 0 | 4 | 3
Extension of Maturity Date | 12 | 3 | 54 | 12
Combination Interest Rate Reduction Maturity Date Extension | 0 | 0 | 0 | 0
Other Modifications | 0 | 0 | 0 | 0
Commercial and industrial |  |  |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |  |  |
Reduction In Interest Rate | 2 | 1 | 6 | 3
Extension of Maturity Date | 25 | 15 | 75 | 36
Combination Interest Rate Reduction Maturity Date Extension | 0 | 0 | 0 | 0
Other Modifications | 0 | 0 | 0 | 0
Construction |  |  |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |  |  |
Reduction In Interest Rate | 0 |  | 1 |
Extension of Maturity Date | 0 |  | 0 |
Combination Interest Rate Reduction Maturity Date Extension | 0 |  | 0 |
Other Modifications | 0 |  | 0 |
Mortgages |  |  |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |  |  |
Reduction In Interest Rate | 28 | 13 | 73 | 45
Extension of Maturity Date | 7 | 14 | 17 | 35
Combination Interest Rate Reduction Maturity Date Extension | 70 | 83 | 173 | 301
Other Modifications | 11 | 16 | 56 | 116
Leasing |  |  |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |  |  |
Reduction In Interest Rate | 0 | 0 | 0 | 0
Extension of Maturity Date | 0 | 0 | 0 | 1
Combination Interest Rate Reduction Maturity Date Extension | 3 | 1 | 4 | 6
Other Modifications | 0 | 0 | 0 | 0
Credit cards |  |  |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |  |  |
Reduction In Interest Rate | 115 | 140 | 426 | 425
Extension of Maturity Date | 0 | 0 | 0 | 0
Combination Interest Rate Reduction Maturity Date Extension | 0 | 4 | 3 | 5
Other Modifications | 72 | 114 | 382 | 424
Home equity lines of credit |  |  |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |  |  |
Reduction In Interest Rate | 0 | 0 | 0 | 0
Extension of Maturity Date | 8 | 0 | 20 | 1
Combination Interest Rate Reduction Maturity Date Extension | 1 | 2 | 8 | 3
Other Modifications | 1 | 0 | 1 | 0
Personal |  |  |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |  |  |
Reduction In Interest Rate | 511 | 187 | 1,139 | 699
Extension of Maturity Date | 1 | 2 | 4 | 6
Combination Interest Rate Reduction Maturity Date Extension | 0 | 1 | 0 | 1
Other Modifications | 0 | 2 | 0 | 3
Auto Loan |  |  |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |  |  |
Reduction In Interest Rate | 0 | 0 | 0 | 0
Extension of Maturity Date | 4 | 1 | 6 | 5
Combination Interest Rate Reduction Maturity Date Extension | 1 | 2 | 2 | 4
Other Modifications | 0 | 0 | 0 | 1
Other |  |  |  |
Troubled Debt Restructuring, Debtor, Current Period [Line Items] |  |  |  |
Reduction In Interest Rate | 1 | 11 | 21 | 27
Extension of Maturity Date | 0 | 0 | 0 | 1
Combination Interest Rate Reduction Maturity Date Extension | 1 | 0 | 2 | 0
Other Modifications | 0 | 0 | 0 | 1

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