Securities (Details 2) - USD ($)
$ in Thousands |
6 Months Ended |
12 Months Ended |
Jun. 30, 2017 |
Dec. 31, 2016 |
| Fair Value |
|
|
| Less than 12 Months |
$ 723,594
|
$ 829,108
|
| 12 Months or Longer |
161,038
|
150,125
|
| Total |
884,632
|
979,233
|
| Unrealized Losses |
|
|
| Less than 12 Months |
8,792
|
13,945
|
| 12 Months or Longer |
5,487
|
5,474
|
| Total |
14,279
|
19,419
|
| Fair Value |
|
|
| Less than 12 Months |
13,629
|
43,369
|
| 12 Months or Longer |
0
|
0
|
| Total |
13,629
|
43,369
|
| Unrealized Losses |
|
|
| Less than 12 Months |
108
|
286
|
| 12 Months or Longer |
0
|
0
|
| Total |
108
|
286
|
| Obligations of U.S. Government sponsored entities |
|
|
| Fair Value |
|
|
| Less than 12 Months |
136,587
|
208,940
|
| 12 Months or Longer |
245
|
0
|
| Total |
136,832
|
208,940
|
| Unrealized Losses |
|
|
| Less than 12 Months |
1,255
|
2,303
|
| 12 Months or Longer |
5
|
0
|
| Total |
1,260
|
2,303
|
| Fair Value |
|
|
| Less than 12 Months |
10,006
|
40,802
|
| 12 Months or Longer |
0
|
0
|
| Total |
10,006
|
40,802
|
| Unrealized Losses |
|
|
| Less than 12 Months |
102
|
283
|
| 12 Months or Longer |
0
|
0
|
| Total |
102
|
283
|
| Obligations of U.S. states and political subdivisions |
|
|
| Fair Value |
|
|
| Less than 12 Months |
33,531
|
58,852
|
| 12 Months or Longer |
0
|
751
|
| Total |
33,531
|
59,603
|
| Unrealized Losses |
|
|
| Less than 12 Months |
299
|
1,139
|
| 12 Months or Longer |
0
|
1
|
| Total |
299
|
1,140
|
| U.S. Government agencies |
|
|
| Fair Value |
|
|
| Less than 12 Months |
89,033
|
98,307
|
| 12 Months or Longer |
30,703
|
22,376
|
| Total |
119,736
|
120,683
|
| Unrealized Losses |
|
|
| Less than 12 Months |
1,024
|
1,570
|
| 12 Months or Longer |
800
|
702
|
| Total |
1,824
|
2,272
|
| U.S. Government sponsored entities |
|
|
| Fair Value |
|
|
| Less than 12 Months |
464,443
|
463,009
|
| 12 Months or Longer |
127,008
|
123,915
|
| Total |
591,451
|
586,924
|
| Unrealized Losses |
|
|
| Less than 12 Months |
6,214
|
8,933
|
| 12 Months or Longer |
4,263
|
4,354
|
| Total |
10,477
|
13,287
|
| U.S. corporate debt securities |
|
|
| Fair Value |
|
|
| Less than 12 Months |
0
|
0
|
| 12 Months or Longer |
2,163
|
2,162
|
| Total |
2,163
|
2,162
|
| Unrealized Losses |
|
|
| Less than 12 Months |
0
|
0
|
| 12 Months or Longer |
338
|
338
|
| Total |
338
|
338
|
| Equity securities |
|
|
| Fair Value |
|
|
| Less than 12 Months |
0
|
0
|
| 12 Months or Longer |
919
|
921
|
| Total |
919
|
921
|
| Unrealized Losses |
|
|
| Less than 12 Months |
0
|
0
|
| 12 Months or Longer |
81
|
79
|
| Total |
81
|
79
|
| Obligations of U.S. states and political subdivisions |
|
|
| Fair Value |
|
|
| Less than 12 Months |
3,623
|
2,567
|
| 12 Months or Longer |
0
|
0
|
| Total |
3,623
|
2,567
|
| Unrealized Losses |
|
|
| Less than 12 Months |
6
|
3
|
| 12 Months or Longer |
0
|
0
|
| Total |
$ 6
|
$ 3
|