Investments (Gross Unrealized Losses and Fair Values of Securities) (Details) - USD ($)
$ in Thousands |
Sep. 30, 2017 |
Dec. 31, 2016 |
| Schedule of Investments [Line Items] |
|
|
| Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value |
$ 66,783
|
$ 98,642
|
| Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses |
435
|
2,063
|
| Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value |
66,719
|
23,188
|
| Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses |
6,246
|
7,767
|
| Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value |
12,198
|
27,918
|
| Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss |
107
|
598
|
| Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value |
11,196
|
0
|
| Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss |
244
|
0
|
| US government agencies [Member] |
|
|
| Schedule of Investments [Line Items] |
|
|
| Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value |
4,977
|
24,253
|
| Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses |
23
|
747
|
| Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value |
24,501
|
0
|
| Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses |
499
|
0
|
| Residential mortgage-backed agencies [Member] |
|
|
| Schedule of Investments [Line Items] |
|
|
| Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value |
12,198
|
20,899
|
| Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss |
107
|
279
|
| Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value |
7,005
|
0
|
| Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss |
194
|
0
|
| Commercial mortgage-backed agencies [Member] |
|
|
| Schedule of Investments [Line Items] |
|
|
| Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value |
30,170
|
51,604
|
| Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses |
233
|
757
|
| Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value |
11,653
|
0
|
| Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses |
361
|
0
|
| Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value |
|
4,684
|
| Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss |
|
149
|
| Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value |
|
0
|
| Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss |
|
0
|
| Collateralized mortgage obligations [Member] |
|
|
| Schedule of Investments [Line Items] |
|
|
| Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value |
28,222
|
14,706
|
| Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses |
163
|
399
|
| Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value |
13,009
|
0
|
| Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses |
325
|
0
|
| Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value |
0
|
|
| Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss |
0
|
|
| Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value |
4,191
|
|
| Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss |
50
|
|
| Obligations of states and political subdivisions [Member] |
|
|
| Schedule of Investments [Line Items] |
|
|
| Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value |
3,414
|
8,079
|
| Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses |
16
|
160
|
| Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value |
2,838
|
2,934
|
| Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses |
60
|
91
|
| Held-to-maturity securities, continuous unrealized loss position, less than twelve months, fair value |
0
|
2,335
|
| Held-to-maturity securities, continuous unrealized loss position, less than 12 months, unrealized loss |
0
|
170
|
| Held-to-maturity securities, continuous unrealized loss position, twelve months or longer, fair value |
0
|
0
|
| Held-to-maturity securities, continuous unrealized loss position, 12 months or longer, unrealized loss |
0
|
0
|
| Collateralized debt obligations [Member] |
|
|
| Schedule of Investments [Line Items] |
|
|
| Available-for-sale securities, continuous unrealized loss position, less than twelve months, fair value |
0
|
0
|
| Available-for-sale securities, continuous unrealized loss position, less than 12 months, unrealized losses |
0
|
0
|
| Available-for-sale securities, continuous unrealized loss position, twelve months or longer, fair value |
14,718
|
20,254
|
| Available-for-sale securities, continuous unrealized loss position, 12 months or longer, unrealized losses |
$ 5,001
|
$ 7,676
|