|
Derivative Instruments (Details) (USD $)
|
12 Months Ended |
|
Dec. 31, 2014
|
Dec. 31, 2013
|
| Interest Rate Swap on Trust Preferred Securities [Member] |
|
|
| Derivative [Line Items] |
|
|
| Interest rate swap agreement Notional amount |
$ 25,000,000 |
|
| Interest payment period |
7 years |
|
| Fixed interest rate |
6.15% |
|
| Variable rate basis |
three-month LIBOR |
|
| Variable interest rate |
2.85% |
|
| Rate received by Southwest |
3.08% |
|
| Pretax loss related to derivative contracts |
1,600,000 |
2,000,000 |
| Gain or loss due to changes in the fair value of the derivative hedging instrument |
300,000 |
700,000 |
| Net cash flows as a result of the interest rate swap agreement |
800,000 |
800,000 |
| The fair value of cash and securities posted as collateral |
2,100,000 |
4,100,000 |
| Customer Risk Management Swaps [Member] |
|
|
| Derivative [Line Items] |
|
|
| Number of customer interest rate swap agreements |
3 |
|
| Derivative Asset, Notional Amount |
34,322,000 |
|
| Derivative Liability, Notional Amount |
34,322,000 |
|
| Variable rate basis |
one-month LIBOR |
|
| The fair value of cash and securities posted as collateral |
300,000 |
|
| Non-hedge derivative asset, fair value |
787,000 |
|
| Non-hedge derivative liability, fair value |
$ 787,000 |
|
| Customer Risk Management Swap 1 [Member] |
|
|
| Derivative [Line Items] |
|
|
| Variable interest rate |
2.97% |
|
| Customer Risk Management Swap 2 [Member] |
|
|
| Derivative [Line Items] |
|
|
| Variable interest rate |
2.87% |
|
| Customer Risk Management Swap 3 [Member] |
|
|
| Derivative [Line Items] |
|
|
| Variable interest rate |
2.30% |
|