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Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2012
Investment Securities [Abstract] |
Summary information regarding investment securities classified as available for sale and held to maturity |
(dollars in thousands) |  |  |  |  |  |  |  | Gross Unrealized Losses |  |  |  |
June 30, 2012 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Less Than 1 Year |  |  | Over 1 Year |  |  | Fair Value |
Available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. agency mortgage-backed |  | $ | 106,150 |  |  | $ | 3,224 |  |  | $ | 5 |  |  | $ | — |  |  | $ | 109,369 |
Non-U.S. agency mortgage-backed |  |  | 13,746 |  |  |  | 126 |  |  |  | 8 |  |  |  | 236 |  |  |  | 13,628 |
Municipal bonds |  |  | 11,542 |  |  |  | 651 |  |  |  | — |  |  |  | — |  |  |  | 12,193 |
U.S. government agency |  |  | 17,143 |  |  |  | 387 |  |  |  | 2 |  |  |  | — |  |  |  | 17,528 |
Total available for sale |  | $ | 148,581 |  |  | $ | 4,388 |  |  | $ | 15 |  |  | $ | 236 |  |  | $ | 152,718 |
Held to maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. agency mortgage-backed |  | $ | 1,451 |  |  | $ | 23 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,474 |
Municipal bonds |  |  | 972 |  |  |  | 71 |  |  |  | — |  |  |  | — |  |  |  | 1,043 |
Total held to maturity |  | $ | 2,423 |  |  | $ | 94 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,517 |
(dollars in thousands) |  |  |  |  |  |  |  | Gross Unrealized Losses |  |  |  |
December 31, 2011 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Less Than 1 Year |  |  | Over 1 Year |  |  | Fair Value |
Available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. agency mortgage-backed |  | $ | 113,692 |  |  | $ | 2,879 |  |  | $ | 42 |  |  | $ | — |  |  | $ | 116,529 |
Non-U.S. agency mortgage-backed |  |  | 14,833 |  |  |  | 37 |  |  |  | 766 |  |  |  | 425 |  |  |  | 13,679 |
Municipal bonds |  |  | 11,598 |  |  |  | 623 |  |  |  | — |  |  |  | — |  |  |  | 12,221 |
U.S. government agency |  |  | 12,521 |  |  |  | 310 |  |  |  | — |  |  |  | — |  |  |  | 12,831 |
Total available for sale |  | $ | 152,644 |  |  | $ | 3,849 |  |  | $ | 808 |  |  | $ | 425 |  |  | $ | 155,260 |
Held to maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. agency mortgage-backed |  | $ | 2,289 |  |  | $ | 49 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,338 |
Municipal bonds |  |  | 1,173 |  |  |  | 64 |  |  |  | — |  |  |  | — |  |  |  | 1,237 |
Total held to maturity |  | $ | 3,462 |  |  | $ | 113 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,575 |
Schedule of fair value and amortized cost by maturity of investment securities |
(dollars in thousands) |  | One Year or Less |  |  | One Year to Five Years |  |  | Five to Ten Years |  |  | Over Ten Years |  |  | Total |
Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. agency mortgage-backed |  | $ | — |  |  | $ | 1,256 |  |  | $ | 8,788 |  |  | $ | 99,325 |  |  | $ | 109,369 |
Non-U.S. agency mortgage-backed |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 13,628 |  |  |  | 13,628 |
Municipal bonds |  |  | — |  |  |  | 3,238 |  |  |  | 6,032 |  |  |  | 2,923 |  |  |  | 12,193 |
U.S. government agency |  |  | — |  |  |  | 5,912 |  |  |  | 6,117 |  |  |  | 5,499 |  |  |  | 17,528 |
Total available for sale |  | $ | — |  |  | $ | 10,406 |  |  | $ | 20,937 |  |  | $ | 121,375 |  |  | $ | 152,718 |
Securities held to maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. agency mortgage-backed |  | $ | 17 |  |  | $ | 1,017 |  |  | $ | 440 |  |  | $ | — |  |  | $ | 1,474 |
Municipal bonds |  |  | — |  |  |  | 1,043 |  |  |  | — |  |  |  | — |  |  |  | 1,043 |
Total held to maturity |  |  | 17 |  |  |  | 2,060 |  |  |  | 440 |  |  |  | — |  |  |  | 2,517 |
Total investment securities |  | $ | 17 |  |  | $ | 12,466 |  |  | $ | 21,377 |  |  | $ | 121,375 |  |  | $ | 155,235 |
(dollars in thousands) |  | One Year or Less |  |  | One Year to Five Years |  |  | Five to Ten Years |  |  | Over Ten Years |  |  | Total |
Amortized Cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available for sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. agency mortgage-backed |  | $ | — |  |  | $ | 1,184 |  |  | $ | 8,666 |  |  | $ | 96,300 |  |  | $ | 106,150 |
Non-U.S. agency mortgage-backed |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 13,746 |  |  |  | 13,746 |
Municipal bonds |  |  | — |  |  |  | 3,148 |  |  |  | 5,649 |  |  |  | 2,745 |  |  |  | 11,542 |
U.S. government agency |  |  | — |  |  |  | 5,863 |  |  |  | 5,975 |  |  |  | 5,305 |  |  |  | 17,143 |
Total available for sale |  | $ | — |  |  | $ | 10,195 |  |  | $ | 20,290 |  |  | $ | 118,096 |  |  | $ | 148,581 |
Securities held to maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. agency mortgage-backed |  | $ | 17 |  |  | $ | 997 |  |  | $ | 437 |  |  | $ | — |  |  | $ | 1,451 |
Municipal bonds |  |  | — |  |  |  | 972 |  |  |  | — |  |  |  | — |  |  |  | 972 |
Total held to maturity |  |  | 17 |  |  |  | 1,969 |  |  |  | 437 |  |  |  | — |  |  |  | 2,423 |
Total investment securities |  | $ | 17 |  |  | $ | 12,164 |  |  | $ | 20,727 |  |  | $ | 118,096 |  |  | $ | 151,004 |

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