Securities (Details 2) - USD ($)
$ in Thousands |
9 Months Ended |
12 Months Ended |
Sep. 30, 2016 |
Dec. 31, 2015 |
| Available-for-sale securities |
|
|
| Less Than 12 Months, Fair Value |
$ 134,766
|
$ 606,155
|
| Less Than 12 Months, Unrealized Losses |
584
|
6,211
|
| 12 Months or Longer, Fair Value |
159,008
|
218,918
|
| 12 Months or Longer, Unrealized Losses |
2,618
|
7,906
|
| Total Fair Value |
293,774
|
825,073
|
| Total Unrealized Losses |
3,202
|
14,117
|
| Held-to-maturity debt securities |
|
|
| Less Than 12 Months, Fair Value |
|
31,637
|
| Less Than 12 Months, Unrealized Losses |
|
448
|
| 12 Months or Longer, Fair Value |
|
0
|
| 12 Months or Longer, Unrealized Losses |
|
0
|
| Total Fair Value |
|
31,637
|
| Total Unrealized Losses |
|
448
|
| Obligations of U.S. Government Sponsored Entities [Member] |
|
|
| Available-for-sale securities |
|
|
| Less Than 12 Months, Fair Value |
1,347
|
183,697
|
| Less Than 12 Months, Unrealized Losses |
2
|
1,618
|
| 12 Months or Longer, Fair Value |
0
|
5,844
|
| 12 Months or Longer, Unrealized Losses |
0
|
177
|
| Total Fair Value |
1,347
|
189,541
|
| Total Unrealized Losses |
2
|
1,795
|
| Held-to-maturity debt securities |
|
|
| Less Than 12 Months, Fair Value |
|
29,671
|
| Less Than 12 Months, Unrealized Losses |
|
444
|
| 12 Months or Longer, Fair Value |
|
0
|
| 12 Months or Longer, Unrealized Losses |
|
0
|
| Total Fair Value |
|
29,671
|
| Total Unrealized Losses |
|
444
|
| Obligations of U.S. States and Political Subdivisions [Member] |
|
|
| Available-for-sale securities |
|
|
| Less Than 12 Months, Fair Value |
8,175
|
25,402
|
| Less Than 12 Months, Unrealized Losses |
12
|
141
|
| 12 Months or Longer, Fair Value |
754
|
3,408
|
| 12 Months or Longer, Unrealized Losses |
1
|
12
|
| Total Fair Value |
8,929
|
28,810
|
| Total Unrealized Losses |
13
|
153
|
| Residential Mortgage-Backed Securities U.S. Government Agencies [Member] |
|
|
| Available-for-sale securities |
|
|
| Less Than 12 Months, Fair Value |
32,598
|
32,636
|
| Less Than 12 Months, Unrealized Losses |
89
|
350
|
| 12 Months or Longer, Fair Value |
23,615
|
30,244
|
| 12 Months or Longer, Unrealized Losses |
347
|
966
|
| Total Fair Value |
56,213
|
62,880
|
| Total Unrealized Losses |
436
|
1,316
|
| Residential Mortgage-Backed Securities U.S. Government Sponsored Entities [Member] |
|
|
| Available-for-sale securities |
|
|
| Less Than 12 Months, Fair Value |
92,646
|
364,420
|
| Less Than 12 Months, Unrealized Losses |
481
|
4,102
|
| 12 Months or Longer, Fair Value |
131,532
|
176,325
|
| 12 Months or Longer, Unrealized Losses |
1,876
|
6,347
|
| Total Fair Value |
224,178
|
540,745
|
| Total Unrealized Losses |
2,357
|
10,449
|
| U.S. corporate Debt Securities [Member] |
|
|
| Available-for-sale securities |
|
|
| Less Than 12 Months, Fair Value |
0
|
0
|
| Less Than 12 Months, Unrealized Losses |
0
|
0
|
| 12 Months or Longer, Fair Value |
2,163
|
2,163
|
| 12 Months or Longer, Unrealized Losses |
338
|
338
|
| Total Fair Value |
2,163
|
2,163
|
| Total Unrealized Losses |
338
|
338
|
| Equity Securities [Member] |
|
|
| Available-for-sale securities |
|
|
| Less Than 12 Months, Fair Value |
0
|
0
|
| Less Than 12 Months, Unrealized Losses |
0
|
0
|
| 12 Months or Longer, Fair Value |
944
|
934
|
| 12 Months or Longer, Unrealized Losses |
56
|
66
|
| Total Fair Value |
944
|
934
|
| Total Unrealized Losses |
$ 56
|
66
|
| Obligations of U.S. Sponsored Entities [Member] |
|
|
| Held-to-maturity debt securities |
|
|
| Less Than 12 Months, Fair Value |
|
1,966
|
| Less Than 12 Months, Unrealized Losses |
|
4
|
| 12 Months or Longer, Fair Value |
|
0
|
| 12 Months or Longer, Unrealized Losses |
|
0
|
| Total Fair Value |
|
1,966
|
| Total Unrealized Losses |
|
$ 4
|