|
Fair Value Measurements (Narrative) (Details) (USD $)
|
12 Months Ended |
|
Dec. 31, 2014
|
Dec. 31, 2013
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
| Private equity investment Southwest's proportionate share of the net asset value |
$ 0 |
$ 2,400,000 |
| Impairment charges |
0 |
0 |
| Noncovered [Member] |
|
|
| Finite-Lived Intangible Assets [Line Items] |
|
|
| Noncovered impaired loans carrying amount |
21,900,000 |
47,000,000 |
| Noncovered impaired loans measured at fair value |
17,500,000 |
33,700,000 |
| Noncovered impaired loans life to date impairment |
4,400,000 |
13,300,000 |
| Impairment charge of other real estate assets |
$ 600,000 |
$ 2,200,000 |