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Securities (Tables) | 9 Months Ended
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Sep. 30, 2013
Investments debt and equity securities [Abstract] |
Available-for-sale Securities [Table Text Block] |
|  |  | 1 year | 1 to 5 | 5 to 10 | After 10 | Fair |  | Gross Unrealized |  | Amortized
(Dollars in thousands) |  | or less | years | years | years | Value |  | Gains | Losses |  | Cost
September 30, 2013 |  |  |  |  |  |  |  |  |  |  |  |
Agency obligations (a) | $ | — | — | 23,744 | 22,079 | 45,823 |  | — | 3,253 |  | $ | 49,076
Agency RMBS (a) |  | — | — | 3,679 | 142,311 | 145,990 |  | 1,196 | 3,179 |  |  | 147,973
State and political subdivisions |  | — | 2,096 | 19,739 | 45,077 | 66,912 |  | 1,998 | 399 |  |  | 65,313
Trust preferred securities |  | — | — | — | 742 | 742 |  | 164 | 115 |  |  | 693
| Total available-for-sale | $ | — | 2,096 | 47,162 | 210,209 | 259,467 |  | 3,358 | 6,946 |  | $ | 263,055
December 31, 2012 |  |  |  |  |  |  |  |  |  |  |
Agency obligations (a) | $ | — | — | 20,065 | 19,460 | 39,525 |  | 187 | 19 |  | $ | 39,357
Agency RMBS (a) |  | — | — | 4,700 | 136,760 | 141,460 |  | 3,012 | 162 |  |  | 138,610
State and political subdivisions |  | 111 | 1,830 | 21,006 | 54,891 | 77,838 |  | 5,222 | — |  |  | 72,616
Trust preferred securities |  | — | — | — | 652 | 652 |  | 113 | 154 |  |  | 693
| Total available-for-sale | $ | 111 | 1,830 | 45,771 | 211,763 | 259,475 |  | 8,534 | 335 |  | $ | 251,276
(a) Includes securities issued by U.S. government agencies or government sponsored entities.
Available-for-sale Securities, Continuous Unrealized Loss Position [Table Text Block] |
|  |  |  | Less than 12 Months |  |  | 12 Months or Longer |  |  | Total
|  |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized
(Dollars in thousands) |  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses
September 30, 2013: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency obligations | $ | 45,822 |  |  | 3,253 |  |  | — |  |  | — |  | $ | 45,822 |  |  | 3,253
Agency RMBS |  | 95,325 |  |  | 3,179 |  |  | — |  |  | — |  |  | 95,325 |  |  | 3,179
State and political subdivisions |  | 7,751 |  |  | 399 |  |  | — |  |  | — |  |  | 7,751 |  |  | 399
Trust preferred securities |  | — |  |  | — |  |  | 385 |  |  | 115 |  | $ | 385 |  |  | 115
|  | Total | $ | 148,898 |  |  | 6,831 |  |  | 385 |  |  | 115 |  | $ | 149,283 |  |  | 6,946
December 31, 2012: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency obligations | $ | 9,966 |  |  | 19 |  |  | — |  |  | — |  | $ | 9,966 |  |  | 19
Agency RMBS |  | 25,207 |  |  | 162 |  |  | — |  |  | — |  |  | 25,207 |  |  | 162
Trust preferred securities |  | — |  |  | — |  |  | 346 |  |  | 154 |  |  | 346 |  |  | 154
|  | Total | $ | 35,173 |  |  | 181 |  |  | 346 |  |  | 154 |  | $ | 35,519 |  |  | 335
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block] |
|  |  |  | Quarter ended September 30, |  |  | Nine months ended September 30,
(Dollars in thousands) |  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012
Balance, beginning of period | $ | 757 |  | $ | 1,257 |  | $ | 1,257 |  | $ | 3,276
| Additions: |  |  |  |  |  |  |  |  |  |  |
|  | Subsequent credit impairments |  | — |  |  | — |  |  | — |  |  | 130
| Reductions: |  |  |  |  |  |  |  |  |  |  |
|  | Securities sold |  | — |  |  | — |  |  | — |  |  | 2,149
|  | Securities fully written down and deemed worthless |  | — |  |  | — |  |  | 500 |  |  | —
Balance, end of period | $ | 757 |  | $ | 1,257 |  | $ | 757 |  | $ | 1,257
Available For Sale Securiites Changes In Other Than Temporary Impairment Losses [Table Text Block] |
|  |  |  |  | Quarter ended September 30, |  |  | Nine months ended September 30,
(Dollars in thousands) |  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012
Other-than-temporary impairment charges |  |  |  |  |  |  |  |  |  |  |
| (included in earnings): |  |  |  |  |  |  |  |  |  |  |
| Debt securities: |  |  |  |  |  |  |  |  |  |  |
|  | Individual issuer trust preferred securities | $ | — |  | $ | — |  | $ | — |  | $ | 130
|  |  | Total debt securities |  | — |  |  | — |  |  | — |  |  | 130
Total other-than-temporary impairment charges | $ | — |  | $ | — |  | $ | — |  | $ | 130
Other-than-temporary impairment on debt securities: |  |  |  |  |  |  |  |  |  |
| Recorded as part of gross realized losses: |  |  |  |  |  |  |  |  |  |  |
|  | Credit-related | $ | — |  | $ | — |  | $ | — |  | $ | 130
Total other-than-temporary impairment on debt securities | $ | — |  | $ | — |  | $ | — |  | $ | 130
Schedule of Realized Gain (Loss) [Table Text Block] |
Realized Gains and Losses
|  | The following table presents the gross realized gains and losses on sales and other-than-temporary impairment charges
related to securities.
|  |  |  |  | Quarter ended September 30, |  |  | Nine months ended September 30,
(Dollars in thousands) |  |  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012
Gross realized gains |  | $ | — |  | $ | 203 |  | $ | 685 |  | $ | 927
Gross realized losses |  |  | — |  |  | (25) |  |  | (6) |  |  | (189)
Other-than-temporary impairment charges |  |  | — |  |  | — |  |  | — |  |  | (130)
|  | Realized gains, net |  | $ | — |  | $ | 178 |  | $ | 679 |  | $ | 608

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