Supplementary Information on Cash Flow Activities (Details) - USD ($)
$ in Thousands |
12 Months Ended |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
| Noncash transactions affecting cash flows activities [Abstract] |
|
|
|
| Change in net unrealized (gain) loss on securities available for sale, including deferred income tax (asset)/liability of $1,085, $(5,717), and $4,717 in 2016, 2015, and 2014, respectively |
$ 107
|
$ 38,989
|
$ (35,883)
|
| Change in liability for pension benefits, and deferred income tax (asset)/liability of $10,792, $10,124, $(12,298), in 2016, 2015, and 2014, respectively |
(16,879)
|
(15,836)
|
19,236
|
| Repurchase and retirement of common stock |
(56)
|
(182)
|
(3,049)
|
| Exercise of stock options |
55
|
179
|
2,885
|
| Unsettled sales |
0
|
0
|
10,456
|
| Other [Abstract] |
|
|
|
| Income taxes paid |
11,549
|
6,437
|
16,069
|
| Interest paid |
7,635
|
4,792
|
5,764
|
| Change in net unrealized (gain) loss on securities available for sale, Deferred income tax (asset)/liability |
1,085
|
(5,717)
|
4,717
|
| Change in liability for pension benefits, Deferred income tax (asset)/liability |
$ 10,792
|
$ 10,124
|
$ (12,298)
|