| Period | Estimated volume - Total | Estimated volume - Past due 30 to 89 days, accruing | Estimated volume - Nonperforming - Total | Estimated volume - Nonperforming - Past due 90 days, accruing | Estimated volume - Nonperforming - Non-accruing | Share of outstanding loans - Total | Share of outstanding loans - Past due 30 to 89 days, accuring | Share of outstanding loans - Nonperforming - Total | Share of outstanding loans - Nonperforming - Past due 90 days, accruing | Share of outstanding loans - Nonperforming - Non-accruing |
|--------|--------------------------|-----------------------------------------------------|------------------------------------------|---------------------------------------------------------------|-------------------------------------------------|------------------------------------|---------------------------------------------------------------|----------------------------------------------------|-------------------------------------------------------------------------|-----------------------------------------------------------|
| 1987Q1 | 3                        | 0.8                                                 | 2.2                                      | 0.5                                                           | 1.7                                             | 10.4                               | 2.7                                                           | 7.7                                                | 1.6                                                                     | 6.1                                                       |
| 1987Q2 | 2.5                      | 0.4                                                 | 2                                        | 0.4                                                           | 1.6                                             | 8.1                                | 1.3                                                           | 6.7                                                | 1.3                                                                     | 5.4                                                       |
| 1987Q3 | 2.1                      | 0.3                                                 | 1.8                                      | 0.3                                                           | 1.5                                             | 6.7                                | 1                                                             | 5.7                                                | 0.9                                                                     | 4.8                                                       |
| 1987Q4 | 1.9                      | 0.5                                                 | 1.4                                      | 0.2                                                           | 1.2                                             | 6.5                                | 1.7                                                           | 4.8                                                | 0.7                                                                     | 4.2                                                       |
| 1988Q1 | 2                        | 0.5                                                 | 1.5                                      | 0.3                                                           | 1.2                                             | 7.1                                | 2                                                             | 5.2                                                | 1                                                                       | 4.2                                                       |
| 1988Q2 | 1.7                      | 0.3                                                 | 1.3                                      | 0.2                                                           | 1.1                                             | 5.5                                | 1                                                             | 4.5                                                | 0.7                                                                     | 3.7                                                       |
| 1988Q3 | 1.5                      | 0.3                                                 | 1.2                                      | 0.2                                                           | 1                                               | 4.9                                | 0.9                                                           | 4                                                  | 0.6                                                                     | 3.4                                                       |
| 1988Q4 | 1.4                      | 0.4                                                 | 1                                        | 0.1                                                           | 0.9                                             | 4.5                                | 1.2                                                           | 3.3                                                | 0.5                                                                     | 2.9                                                       |
| 1989Q1 | 1.6                      | 0.5                                                 | 1                                        | 0.2                                                           | 0.8                                             | 5.5                                | 1.9                                                           | 3.5                                                | 0.6                                                                     | 2.9                                                       |
| 1989Q2 | 1.4                      | 0.4                                                 | 1                                        | 0.2                                                           | 0.8                                             | 4.4                                | 1.3                                                           | 3.2                                                | 0.6                                                                     | 2.5                                                       |
| 1989Q3 | 1.2                      | 0.3                                                 | 0.9                                      | 0.2                                                           | 0.7                                             | 3.8                                | 1.1                                                           | 2.7                                                | 0.5                                                                     | 2.2                                                       |
| 1989Q4 | 1.1                      | 0.4                                                 | 0.7                                      | 0.1                                                           | 0.6                                             | 3.7                                | 1.3                                                           | 2.3                                                | 0.5                                                                     | 1.9                                                       |
| 1990Q1 | 1.4                      | 0.6                                                 | 0.8                                      | 0.19                                                          | 0.6                                             | 4.76                               | 2.05                                                          | 2.71                                               | 0.66                                                                    | 2.05                                                      |
| 1990Q2 | 1.13                     | 0.38                                                | 0.75                                     | 0.16                                                          | 0.59                                            | 3.54                               | 1.19                                                          | 2.35                                               | 0.51                                                                    | 1.85                                                      |
| 1990Q3 | 1.05                     | 0.37                                                | 0.68                                     | 0.14                                                          | 0.54                                            | 3.16                               | 1.11                                                          | 2.04                                               | 0.41                                                                    | 1.63                                                      |
| 1990Q4 | 1.03                     | 0.41                                                | 0.62                                     | 0.1                                                           | 0.51                                            | 3.13                               | 1.26                                                          | 1.87                                               | 0.31                                                                    | 1.56                                                      |
| 1991Q1 | 1.33                     | 0.64                                                | 0.69                                     | 0.18                                                          | 0.51                                            | 4.15                               | 2                                                             | 2.16                                               | 0.56                                                                    | 1.6                                                       |
| 1991Q2 | 1.15                     | 0.43                                                | 0.72                                     | 0.16                                                          | 0.56                                            | 3.35                               | 1.25                                                          | 2.09                                               | 0.47                                                                    | 1.62                                                      |
| 1991Q3 | 1.03                     | 0.34                                                | 0.7                                      | 0.14                                                          | 0.55                                            | 2.91                               | 0.95                                                          | 1.96                                               | 0.4                                                                     | 1.56                                                      |
| 1991Q4 | 1.09                     | 0.44                                                | 0.65                                     | 0.11                                                          | 0.54                                            | 3.16                               | 1.27                                                          | 1.89                                               | 0.33                                                                    | 1.56                                                      |
| 1992Q1 | 1.41                     | 0.63                                                | 0.78                                     | 0.2                                                           | 0.58                                            | 4.26                               | 1.9                                                           | 2.36                                               | 0.59                                                                    | 1.76                                                      |
| 1992Q2 | 1.17                     | 0.39                                                | 0.78                                     | 0.19                                                          | 0.59                                            | 3.3                                | 1.1                                                           | 2.19                                               | 0.54                                                                    | 1.65                                                      |
| 1992Q3 | 1.1                      | 0.4                                                 | 0.7                                      | 0.15                                                          | 0.55                                            | 3.04                               | 1.1                                                           | 1.94                                               | 0.42                                                                    | 1.52                                                      |
| 1992Q4 | 0.96                     | 0.35                                                | 0.61                                     | 0.1                                                           | 0.52                                            | 2.77                               | 1                                                             | 1.77                                               | 0.28                                                                    | 1.49                                                      |
| 1993Q1 | 1.28                     | 0.52                                                | 0.76                                     | 0.19                                                          | 0.57                                            | 3.89                               | 1.58                                                          | 2.31                                               | 0.58                                                                    | 1.74                                                      |
| 1993Q2 | 0.96                     | 0.28                                                | 0.67                                     | 0.13                                                          | 0.54                                            | 2.71                               | 0.8                                                           | 1.9                                                | 0.38                                                                    | 1.53                                                      |
| 1993Q3 | 0.85                     | 0.24                                                | 0.61                                     | 0.12                                                          | 0.49                                            | 2.29                               | 0.65                                                          | 1.63                                               | 0.32                                                                    | 1.31                                                      |
| 1993Q4 | 0.81                     | 0.29                                                | 0.52                                     | 0.08                                                          | 0.43                                            | 2.2                                | 0.79                                                          | 1.4                                                | 0.22                                                                    | 1.18                                                      |
| 1994Q1 | 1.11                     | 0.52                                                | 0.59                                     | 0.14                                                          | 0.44                                            | 3.12                               | 1.48                                                          | 1.65                                               | 0.41                                                                    | 1.24                                                      |
| 1994Q2 | 0.87                     | 0.29                                                | 0.58                                     | 0.15                                                          | 0.43                                            | 2.21                               | 0.74                                                          | 1.47                                               | 0.37                                                                    | 1.1                                                       |
| 1994Q3 | 0.77                     | 0.25                                                | 0.52                                     | 0.12                                                          | 0.4                                             | 1.89                               | 0.62                                                          | 1.27                                               | 0.29                                                                    | 0.98                                                      |
| 1994Q4 | 0.76                     | 0.33                                                | 0.42                                     | 0.08                                                          | 0.34                                            | 1.95                               | 0.86                                                          | 1.09                                               | 0.2                                                                     | 0.89                                                      |
| 1995Q1 | 1.07                     | 0.58                                                | 0.5                                      | 0.14                                                          | 0.36                                            | 2.91                               | 1.56                                                          | 1.35                                               | 0.37                                                                    | 0.98                                                      |
| 1995Q2 | 0.91                     | 0.38                                                | 0.53                                     | 0.14                                                          | 0.39                                            | 2.27                               | 0.94                                                          | 1.33                                               | 0.36                                                                    | 0.97                                                      |
| 1995Q3 | 0.8                      | 0.29                                                | 0.51                                     | 0.13                                                          | 0.38                                            | 1.93                               | 0.7                                                           | 1.22                                               | 0.31                                                                    | 0.92                                                      |
| 1995Q4 | 0.82                     | 0.38                                                | 0.45                                     | 0.1                                                           | 0.34                                            | 2.07                               | 0.94                                                          | 1.12                                               | 0.26                                                                    | 0.86                                                      |
| 1996Q1 | 1.29                     | 0.69                                                | 0.6                                      | 0.2                                                           | 0.41                                            | 3.43                               | 1.83                                                          | 1.6                                                | 0.52                                                                    | 1.08                                                      |
| 1996Q2 | 1.16                     | 0.49                                                | 0.66                                     | 0.2                                                           | 0.46                                            | 2.82                               | 1.2                                                           | 1.61                                               | 0.48                                                                    | 1.13                                                      |
| 1996Q3 | 0.95                     | 0.34                                                | 0.61                                     | 0.18                                                          | 0.43                                            | 2.28                               | 0.82                                                          | 1.47                                               | 0.42                                                                    | 1.04                                                      |
| 1996Q4 | 0.99                     | 0.48                                                | 0.51                                     | 0.12                                                          | 0.39                                            | 2.44                               | 1.18                                                          | 1.26                                               | 0.3                                                                     | 0.97                                                      |
| 1997Q1 | 1.26                     | 0.67                                                | 0.59                                     | 0.19                                                          | 0.4                                             | 3.27                               | 1.74                                                          | 1.53                                               | 0.49                                                                    | 1.04                                                      |
| 1997Q2 | 1.01                     | 0.41                                                | 0.6                                      | 0.2                                                           | 0.4                                             | 2.36                               | 0.96                                                          | 1.4                                                | 0.46                                                                    | 0.94                                                      |
| 1997Q3 | 0.87                     | 0.31                                                | 0.56                                     | 0.14                                                          | 0.42                                            | 1.97                               | 0.71                                                          | 1.27                                               | 0.33                                                                    | 0.94                                                      |
| 1997Q4 | 0.88                     | 0.4                                                 | 0.49                                     | 0.1                                                           | 0.38                                            | 2                                  | 0.9                                                           | 1.11                                               | 0.23                                                                    | 0.87                                                      |
| 1998Q1 | 1.34                     | 0.78                                                | 0.56                                     | 0.17                                                          | 0.39                                            | 3.17                               | 1.85                                                          | 1.32                                               | 0.41                                                                    | 0.91                                                      |
| 1998Q2 | 1.12                     | 0.51                                                | 0.61                                     | 0.22                                                          | 0.39                                            | 2.41                               | 1.1                                                           | 1.31                                               | 0.48                                                                    | 0.83                                                      |
| 1998Q3 | 0.99                     | 0.38                                                | 0.61                                     | 0.18                                                          | 0.43                                            | 2.1                                | 0.81                                                          | 1.29                                               | 0.38                                                                    | 0.91                                                      |
| 1998Q4 | 1.01                     | 0.48                                                | 0.53                                     | 0.12                                                          | 0.41                                            | 2.22                               | 1.05                                                          | 1.17                                               | 0.27                                                                    | 0.9                                                       |
| 1999Q1 | 1.58                     | 0.92                                                | 0.66                                     | 0.22                                                          | 0.44                                            | 3.68                               | 2.15                                                          | 1.54                                               | 0.51                                                                    | 1.02                                                      |
| 1999Q2 | 1.26                     | 0.54                                                | 0.72                                     | 0.23                                                          | 0.5                                             | 2.8                                | 1.19                                                          | 1.61                                               | 0.5                                                                     | 1.1                                                       |
| 1999Q3 | 0.99                     | 0.37                                                | 0.63                                     | 0.18                                                          | 0.45                                            | 2.19                               | 0.81                                                          | 1.38                                               | 0.39                                                                    | 0.99                                                      |
| 1999Q4 | 0.92                     | 0.35                                                | 0.57                                     | 0.1                                                           | 0.48                                            | 2.09                               | 0.79                                                          | 1.3                                                | 0.22                                                                    | 1.08                                                      |
| 2000Q1 | 1.26                     | 0.64                                                | 0.63                                     | 0.17                                                          | 0.46                                            | 2.99                               | 1.5                                                           | 1.49                                               | 0.41                                                                    | 1.08                                                      |
| 2000Q2 | 1                        | 0.42                                                | 0.59                                     | 0.15                                                          | 0.44                                            | 2.19                               | 0.9                                                           | 1.28                                               | 0.32                                                                    | 0.96                                                      |
| 2000Q3 | 0.89                     | 0.31                                                | 0.57                                     | 0.12                                                          | 0.46                                            | 1.92                               | 0.68                                                          | 1.24                                               | 0.25                                                                    | 0.99                                                      |
| 2000Q4 | 0.98                     | 0.4                                                 | 0.58                                     | 0.08                                                          | 0.49                                            | 2.09                               | 0.86                                                          | 1.23                                               | 0.18                                                                    | 1.05                                                      |
| 2001Q1 | 1.74                     | 0.99                                                | 0.76                                     | 0.19                                                          | 0.57                                            | 3.87                               | 2.19                                                          | 1.68                                               | 0.42                                                                    | 1.26                                                      |
| 2001Q2 | 1.39                     | 0.55                                                | 0.84                                     | 0.2                                                           | 0.63                                            | 2.92                               | 1.16                                                          | 1.76                                               | 0.43                                                                    | 1.33                                                      |
| 2001Q3 | 1.33                     | 0.49                                                | 0.84                                     | 0.17                                                          | 0.67                                            | 2.83                               | 1.05                                                          | 1.78                                               | 0.35                                                                    | 1.43                                                      |
| 2001Q4 | 1.25                     | 0.55                                                | 0.71                                     | 0.1                                                           | 0.6                                             | 2.68                               | 1.17                                                          | 1.51                                               | 0.22                                                                    | 1.29                                                      |
| 2002Q1 | 1.7                      | 0.91                                                | 0.79                                     | 0.17                                                          | 0.62                                            | 3.85                               | 2.07                                                          | 1.79                                               | 0.39                                                                    | 1.4                                                       |
| 2002Q2 | 1.37                     | 0.55                                                | 0.83                                     | 0.21                                                          | 0.61                                            | 2.94                               | 1.17                                                          | 1.77                                               | 0.46                                                                    | 1.31                                                      |
| 2002Q3 | 1.26                     | 0.44                                                | 0.82                                     | 0.19                                                          | 0.64                                            | 2.69                               | 0.94                                                          | 1.76                                               | 0.4                                                                     | 1.36                                                      |
| 2002Q4 | 1.19                     | 0.48                                                | 0.72                                     | 0.14                                                          | 0.58                                            | 2.6                                | 1.04                                                          | 1.57                                               | 0.31                                                                    | 1.25                                                      |
| 2003Q1 | 1.72                     | 0.91                                                | 0.82                                     | 0.18                                                          | 0.63                                            | 3.98                               | 2.09                                                          | 1.89                                               | 0.42                                                                    | 1.47                                                      |
| 2003Q2 | 1.38                     | 0.5                                                 | 0.88                                     | 0.22                                                          | 0.65                                            | 3.07                               | 1.11                                                          | 1.96                                               | 0.5                                                                     | 1.46                                                      |
| 2003Q3 | 1.23                     | 0.41                                                | 0.83                                     | 0.19                                                          | 0.64                                            | 2.71                               | 0.89                                                          | 1.82                                               | 0.42                                                                    | 1.4                                                       |