|
Trust Preferred Securities and Subordinated Debentures (Schedule of Trust Preferred Securities) (Details) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2014
|
Dec. 31, 2013
|
|
| Subordinated Borrowing [Line Items] | ||
| Subordinated debentures | $ 46,393 | $ 46,393 |
| Trust Preferred Securities of the Trusts | 45,000 | 45,000 |
| OKSB Statutory Trust I [Member] | ||
| Subordinated Borrowing [Line Items] | ||
| Subordinated debentures | 20,619 | 20,619 |
| Trust Preferred Securities of the Trusts | 20,000 | 20,000 |
| Rates | 3.35% | 3.35% |
| Final Maturity Date | Jun. 26, 2033 | Jun. 26, 2033 |
| SBI Capital Trust II [Member] | ||
| Subordinated Borrowing [Line Items] | ||
| Subordinated debentures | 25,774 | 25,774 |
| Trust Preferred Securities of the Trusts | 25,000 | 25,000 |
| Rates | 3.08% | 3.09% |
| Final Maturity Date | Oct. 07, 2033 | Oct. 07, 2033 |
| Southwest Capital Trust II [Member] | ||
| Subordinated Borrowing [Line Items] | ||
| Trust Preferred Securities of the Trusts | $ 34,500 | |