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Securities (Tables) | 12 Months Ended
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Dec. 31, 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
December 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |
Agency obligations (a) | $ | — | — | 23,247 | 21,275 | 44,522 |  | — | 4,557 |  | $ | 49,079
Agency RMBS (a) |  | — | — | 8,306 | 154,052 | 162,358 |  | 976 | 4,733 |  |  | 166,115
State and political subdivisions |  | — | 1,735 | 21,366 | 41,238 | 64,339 |  | 1,560 | 459 |  |  | 63,238
| Total available-for-sale | $ | — | 1,735 | 52,919 | 216,565 | 271,219 |  | 2,536 | 9,749 |  | $ | 278,432
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
December 31, 2013: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agency obligations | $ | 35,933 |  |  | 3,182 |  |  | 8,590 |  |  | 1,376 |  |  | 44,523 |  | $ | 4,558
Agency RMBS |  | 109,774 |  |  | 4,393 |  |  | 7,683 |  |  | 339 |  |  | 117,457 |  |  | 4,732
State and political subdivisions |  | 9,575 |  |  | 459 |  |  | — |  |  | — |  |  | 9,575 |  |  | 459
|  | Total | $ | 155,282 |  |  | 8,034 |  |  | 16,273 |  |  | 1,715 |  |  | 171,555 |  | $ | 9,749
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] |
|  |  |  |  | Year ended December 31
(Dollars in thousands) |  |  | 2013 |  |  | 2012 |  |  | 2011
Balance, beginning of period |  | $ | 1,257 |  |  | 3,276 |  |  | 2,938
| Additions: |  |  |  |  |  |  |  |  |
|  | Subsequent credit impairments |  |  | — |  |  | 130 |  |  | 338
| Reductions: |  |  |  |  |  |  |  |  |
|  | Securities sold |  |  | (757) |  |  | (2,149) |  |  | —
|  | Securities fully written down and deemed worthless |  |  | (500) |  |  | — |  |  | —
Balance, end of period |  | $ | — |  |  | 1,257 |  |  | 3,276
Available For Sale Securities Changes In Other Than Temporary Impairment Losses [Table Text Block] |
|  |  |  |  |  | Year ended December 31
(Dollars in thousands) |  |  | 2013 |  |  | 2012 |  |  | 2011
Other-than-temporary impairment charges (included in earnings): |  |  |  |  |  |  |  |  |
| Debt securities: |  |  |  |  |  |  |  |  |
|  | Individual issuer trust preferred securities |  | $ | — |  |  | 130 |  |  | 338
|  |  | Total debt securities |  | $ | — |  |  | 130 |  |  | 338
Total other-than-temporary impairment charges (included in earnings) |  | $ | — |  |  | 130 |  |  | 338
Other-than-temporary impairment on debt securities: |  |  |  |  |  |  |  |  |
| Recorded as part of gross realized losses: |  |  |  |  |  |  |  |  |
|  | Credit-related |  | $ | — |  |  | 130 |  |  | 338
|  | Securities with intent to sell |  |  | — |  |  | — |  |  | —
| Recorded directly to other comprehensive income for non-credit |  |  |  |  |  |  |  |  |
|  | related impairment |  |  | — |  |  | — |  |  | 130
Total other-than-temporary impairment on debt securities |  | $ | — |  |  | 130 |  |  | 468
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.
|  |  |  | Year ended December 31
(Dollars in thousands) |  |  | 2013 |  |  | 2012 |  |  | 2011
Gross realized gains |  | $ | 745 |  |  | 1,005 |  |  | 1,698
Gross realized losses |  |  | (94) |  |  | (196) |  |  | (482)
Other-than-temporary impairment charges |  |  | — |  |  | (130) |  |  | (338)
| Realized gains, net |  | $ | 651 |  |  | 679 |  |  | 878

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