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Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2012
Investment Securities [Abstract] |
Unrealized gains on investment securities [Table Text Block] | The following tables present information related to the Corporation's investment securities at June 30, 2012 and December 31, 2011.
|  | June 30, 2012 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
|  | (in thousands) |
Investment Securities Available-for-Sale: |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 18,301 |  |  | $ | 382 |  |  | $ | — |  |  | $ | 18,683 |
Residential mortgage-backed securities |  |  | 86,792 |  |  |  | 2,002 |  |  |  | — |  |  |  | 88,794 |
Commercial mortgage-backed securities |  |  | 9,742 |  |  |  | 74 |  |  |  | (17 | ) |  |  | 9,799 |
Obligations of U.S. states and political subdivisions |  |  | 81,898 |  |  |  | 3,449 |  |  |  | (203 | ) |  |  | 85,144 |
Trust preferred securities |  |  | 20,610 |  |  |  | 42 |  |  |  | (1,827 | ) |  |  | 18,825 |
Corporate bonds and notes |  |  | 210,859 |  |  |  | 3,432 |  |  |  | (1,587 | ) |  |  | 212,704 |
Asset-backed securities |  |  | 19,643 |  |  |  | 117 |  |  |  | (127 | ) |  |  | 19,633 |
Collateralized mortgage obligations |  |  | 2,854 |  |  |  | — |  |  |  | (1,102 | ) |  |  | 1,752 |
Equity securities |  |  | 772 |  |  |  | 16 |  |  |  | (187 | ) |  |  | 601 |
Other securities |  |  | 11,229 |  |  |  | 47 |  |  |  | (21 | ) |  |  | 11,255 |
Total |  | $ | 462,700 |  |  | $ | 9,561 |  |  | $ | (5,071 | ) |  | $ | 467,190 |
Investment Securities Held-to-Maturity: |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 17,532 |  |  | $ | 103 |  |  | $ | (22 | ) |  | $ | 17,613 |  |
Commercial mortgage-backed securities |  |  | 6,182 |  |  |  | 93 |  |  |  | (8 | ) |  |  | 6,267 |  |
Obligations of U.S. states and political subdivisions |  |  | 39,283 |  |  |  | 3,400 |  |  |  | (1 | ) |  |  | 42,682 |  |
Total |  | $ | 62,997 |  |  | $ | 3,596 |  |  | $ | (31 | ) |  | $ | 66,562 |  |
Total investment securities |  | $ | 525,697 |  |  | $ | 13,157 |  |  |  | $ | (5,102 | ) |  | $ | 533,752 |  |
|  | December 31, 2011 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |  |
|  | (in thousands) |
Investment Securities Available-for-Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 24,781 |  |  | $ | 188 |  |  | $ | — |  |  | $ | 24,969 |  |
Residential mortgage-backed securities |  |  | 113,213 |  |  |  | 2,157 |  |  |  | (6 | ) |  |  | 115,364 |  |
Obligations of U.S. states and political subdivisions |  |  | 66,309 |  |  |  | 2,900 |  |  |  | (36 | ) |  |  | 69,173 |  |
Trust preferred securities |  |  | 20,567 |  |  |  | 14 |  |  |  | (4,394 | ) |  |  | 16,187 |  |
Corporate bonds and notes |  |  | 175,812 |  |  |  | 1,382 |  |  |  | (4,077 | ) |  |  | 173,117 |  |
Collateralized mortgage obligations |  |  | 3,226 |  |  |  | — |  |  |  | (1,327 | ) |  |  | 1,899 |  |
Asset-backed securities |  |  | 7,614 |  |  |  | 52 |  |  |  | (13 | ) |  |  | 7,653 |  |
Equity securities |  |  | 535 |  |  |  | 21 |  |  |  | (273 | ) |  |  | 262 |  |
Other securities |  |  | 5,882 |  |  |  | 21 |  |  |  | (20 | ) |  |  | 5,883 |  |
Total |  | $ | 417,939 |  |  | $ | 6,714 |  |  | $ | (10,146 | ) |  | $ | 414,507 |  |
Investment Securities Held-to-Maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  | $ | 28,262 |  |  | $ | 177 |  |  | $ | (34 | ) |  | $ | 28,405 |  |
Commercial mortgage-backed securities |  |  | 6,276 |  |  |  | — |  |  |  | (69 | ) |  |  | 6,207 |  |
Obligations of U.S. states and political subdivisions |  |  | 37,695 |  |  |  | 2,615 |  |  |  | — |  |  |  | 40,310 |  |
Total |  | $ | 72,233 |  |  | $ | 2,792 |  |  | $ | (103 | ) |  | $ | 74,922 |  |
Total investment securities |  | $ | 490,172 |  |  | $ | 9,506 |  |  | $ | (10,249 | ) |  | $ | 489,429 |  |
Investments classified by maturity date [Table Text Block] |
|  | June 30, 2012 |
|  | Amortized Cost |  |  | Fair Value |
Investment Securities Available-for-Sale : |  | (in thousands) |
Due in one year or less |  | $ | 14,556 |  |  | $ | 14,476 |
Due after one year through five years |  |  | 96,758 |  |  |  | 97,606 |
Due after five years through ten years |  |  | 116,072 |  |  |  | 117,896 |
Due after ten years |  |  | 126,779 |  |  |  | 126,763 |
Residential mortgage-backed securities |  |  | 86,792 |  |  |  | 88,794 |
Commercial mortgage-backed securities |  |  | 9,742 |  |  |  | 9,799 |
Equity securities |  |  | 772 |  |  |  | 601 |
Other securities |  |  | 11,229 |  |  |  | 11,255 |
Total |  | $ | 462,700 |  |  | $ | 467,190 |
Investment Securities Held-to-Maturity : |  |  |  |  |  |  |  |
Due after five years through ten years |  | $ | 5,498 |  |  | $ | 5,607 |
Due after ten years |  |  | 51,317 |  |  |  | 54,688 |
Commercial mortgage-backed securities |  |  | 6,182 |  |  |  | 6,267 |
Total |  | $ | 62,997 |  |  | $ | 66,562 |
Total investment securities |  | $ | 525,697 |  |  | $ | 533,752 |
Schedule of OTTI Charges for period [Table Text Block] |
|  | Six Months Ended |
|  | June 30, |
|  | 2012 |  |  | 2011 |
|  | (in thousands) |
Other than temporary impairment charges |  | $ | 28 |  |  | $ | 18 |
Principal losses on a variable rate CMO |  |  | 170 |  |  |  | 219 |
Total other-than-temporary impairment charges |  | $ | 198 |  |  | $ | 237 |
Schedule of preferred security and associated ratings [Table Text Block] |
Deal Name |  | Single Issuer or Pooled |  | Class/ Tranche |  | Amortized Cost |  | Fair Value |  | Gross Unrealized Gain (Loss) |  | Lowest Credit Rating Assigned |  | Number of Banks Currently Performing |  | Deferrals and Defaults as % of Original Collateral |  | Expected Deferral/Defaults as % of Remaining Performing Collateral
|  | (dollars in thousands)
Countrywide Capital IV |  |  | Single |  |  |  | — |  |  | $ | 1,770 |  |  | $ | 1,747 |  |  | $ | (23 | ) |  |  | BB+ |  |  |  | 1 |  |  |  | None |  |  |  | None |
Countrywide Capital V |  |  | Single |  |  |  | — |  |  |  | 2,747 |  |  |  | 2,731 |  |  |  | (16 | ) |  |  | BB+ |  |  |  | 1 |  |  |  | None |  |  |  | None |
Countrywide Capital V |  |  | Single |  |  |  | — |  |  |  | 250 |  |  |  | 248 |  |  |  | (2 | ) |  |  | BB+ |  |  |  | 1 |  |  |  | None |  |  |  | None |
NPB Capital Trust II |  |  | Single |  |  |  | — |  |  |  | 868 |  |  |  | 894 |  |  |  | 26 |  |  |  | NR |  |  |  | 1 |  |  |  | None |  |  |  | None |
Citigroup Cap IX |  |  | Single |  |  |  | — |  |  |  | 992 |  |  |  | 980 |  |  |  | (12 | ) |  |  | BB |  |  |  | 1 |  |  |  | None |  |  |  | None |
Citigroup Cap IX |  |  | Single |  |  |  | — |  |  |  | 1,904 |  |  |  | 1,891 |  |  |  | (13 | ) |  |  | BB |  |  |  | 1 |  |  |  | None |  |  |  | None |
Citigroup Cap XI |  |  | Single |  |  |  | — |  |  |  | 246 |  |  |  | 244 |  |  |  | (2 | ) |  |  | BB |  |  |  | 1 |  |  |  | None |  |  |  | None |
BAC Capital Trust X |  |  | Single |  |  |  | — |  |  |  | 2,500 |  |  |  | 2,508 |  |  |  | 8 |  |  |  | BB+ |  |  |  | 1 |  |  |  | None |  |  |  | None |
Nationsbank Cap Trust III |  |  | Single |  |  |  | — |  |  |  | 1,571 |  |  |  | 1,125 |  |  |  | (446 | ) |  |  | BB+ |  |  |  | 1 |  |  |  | None |  |  |  | None |
Morgan Stanley Cap Trust IV |  |  | Single |  |  |  | — |  |  |  | 2,500 |  |  |  | 2,380 |  |  |  | (120 | ) |  |  | BB+ |  |  |  | 1 |  |  |  | None |  |  |  | None |
Morgan Stanley Cap Trust IV |  |  | Single |  |  |  | — |  |  |  | 1,742 |  |  |  | 1,665 |  |  |  | (77 | ) |  |  | BB+ |  |  |  | 1 |  |  |  | None |  |  |  | None |
Saturns — GS 2004-06 |  |  | Single |  |  |  | — |  |  |  | 242 |  |  |  | 244 |  |  |  | 2 |  |  |  | BB+ |  |  |  | 1 |  |  |  | None |  |  |  | None |
Saturns — GS 2004-06 |  |  | Single |  |  |  | — |  |  |  | 312 |  |  |  | 314 |  |  |  | 2 |  |  |  | BB+ |  |  |  | 1 |  |  |  | None |  |  |  | None |
Saturns — GS 2004-04 |  |  | Single |  |  |  | — |  |  |  | 780 |  |  |  | 785 |  |  |  | 5 |  |  |  | BB+ |  |  |  | 1 |  |  |  | None |  |  |  | None |
Saturns — GS 2004-04 |  |  | Single |  |  |  | — |  |  |  | 22 |  |  |  | 22 |  |  |  | — |  |  |  | BB+ |  |  |  | 1 |  |  |  | None |  |  |  | None |
Goldman Sachs |  |  | Single |  |  |  | — |  |  |  | 1,000 |  |  |  | 942 |  |  |  | (58 | ) |  |  | BB+ |  |  |  | 1 |  |  |  | None |  |  |  | None |
ALESCO Preferred Funding VI |  |  | Pooled |  |  |  | C2 |  |  |  | 325 |  |  |  | 69 |  |  |  | (256 | ) |  |  | Ca |  |  |  | 36 of 56 |  |  |  | 36.1 | % |  |  | 46.7 | %
ALESCO Preferred Funding VII |  |  | Pooled |  |  |  | C1 |  |  |  | 839 |  |  |  | 36 |  |  |  | (803 | ) |  |  | Ca |  |  |  | 48 of 62 |  |  |  | 35.9 | % |  |  | 47.7 | %
Total |  |  |  |  |  |  |  |  |  | $ | 20,610 |  |  | $ | 18,825 |  |  | $ | (1,785 | ) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit loss portion of OTTI recognized in earnings on debt securities [Table Text Block] |
|  |  |  |  | Six Months Ended June 30, 2012 |  |  | Year Ended December 31, 2011 |
|  |  |  |  | (in thousands) |
Balance of credit-related OTTI at January 1, |  |  |  |  |  | $ | 6,539 |  |  | $ | 6,197 |
Addition: |  |  |  |  |  |  |  |  |  |  |  |
Credit losses on investment securities for which other-than-temporary impairment was not previously recognized |  |  |  |  |  |  | 198 |  |  |  | 342 |
Reduction: |  |  |  |  |  |  |  |  |  |  |  |
Credit losses on investment securities sold during the period |  |  |  |  |  |  | — |  |  |  | — |
Balance of credit-related OTTI at period end |  |  |  |  |  | $ | 6,737 |  |  | $ | 6,539 |
Schedule of unrealized losses not recognized in income [Table Text Block] |
|  | June 30, 2012
|  | Total |  | Less than 12 Months |  | 12 Months or Longer
|  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
|  | (in thousands)
Investment Securities Available-for-Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial mortgage-backed securities |  | $ | 3,080 |  |  | $ | (17 | ) |  | $ | 3,080 |  |  | $ | (17 | ) |  | $ | — |  |  | $ | — |
Obligations of U.S. states and political subdivisions |  |  | 13,166 |  |  |  | (203 | ) |  |  | 13,166 |  |  |  | (203 | ) |  |  | — |  |  |  | — |
Trust preferred securities |  |  | 14,059 |  |  |  | (1,827 | ) |  |  | — |  |  |  | — |  |  |  | 14,059 |  |  |  | (1,827 | )
Corporate bonds and notes |  |  | 85,953 |  |  |  | (1,587 | ) |  |  | 54,310 |  |  |  | (517 | ) |  |  | 31,643 |  |  |  | (1,070 | )
Collateralized mortgage obligations |  |  | 1,752 |  |  |  | (1,102 | ) |  |  | — |  |  |  | — |  |  |  | 1,752 |  |  |  | (1,102 | )
Asset-backed securities |  |  | 8,352 |  |  |  | (127 | ) |  |  | 8,352 |  |  |  | (127 | ) |  |  | — |  |  |  | — |
Equity securities |  |  | 349 |  |  |  | (187 | ) |  |  | — |  |  |  | — |  |  |  | 349 |  |  |  | (187 | )
Other securities |  |  | 978 |  |  |  | (21 | ) |  |  | — |  |  |  | — |  |  |  | 978 |  |  |  | (21 | )
Total |  |  | 127,689 |  |  |  | (5,071 | ) |  |  | 78,908 |  |  |  | (864 | ) |  |  | 48,781 |  |  |  | (4,207 | )
Investment Securities Held-to-Maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  |  | 5,138 |  |  |  | (22 | ) |  |  | 5,138 |  |  |  | (22 | ) |  |  | — |  |  |  | — |
Commercial mortgage-backed securities |  |  | 1,538 |  |  |  | (8 | ) |  |  | 1,538 |  |  |  | (8 | ) |  |  | — |  |  |  | — |
Obligations of U.S. states and political subdivisions |  |  | 1,021 |  |  |  | (1 | ) |  |  | 1,021 |  |  |  | (1 | ) |  |  | — |  |  |  | — |
Total |  |  | 7,697 |  |  |  | (31 | ) |  |  | 7,697 |  |  |  | (31 | ) |  |  | — |  |  |  | — |
Total Temporarily Impaired Securities |  | $ | 135,386 |  |  | $ | (5,102 | ) |  | $ | 86,605 |  |  | $ | (895 | ) |  | $ | 48,781 |  |  | $ | (4,207 | )
|  | December 31, 2011
|  | Total |  | Less than 12 Months |  | 12 Months or Longer
|  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
|  | (in thousands)
Investment Securities Available-for-Sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Residential mortgage pass-through securities |  | $ | 2,013 |  |  | $ | (6 | ) |  | $ | 2,013 |  |  | $ | (6 | ) |  | $ | — |  |  | $ | — |
Obligations of U.S. states and political subdivisions |  |  | 4,352 |  |  |  | (36 | ) |  |  | 4,352 |  |  |  | (36 | ) |  |  | — |  |  |  | — |
Trust preferred securities |  |  | 15,272 |  |  |  | (4,394 | ) |  |  | 4,325 |  |  |  | (996 | ) |  |  | 10,947 |  |  |  | (3,398 | )
Corporate bonds and notes |  |  | 97,043 |  |  |  | (4,077 | ) |  |  | 89,534 |  |  |  | (3,663 | ) |  |  | 7,509 |  |  |  | (414 | )
Collateralized mortgage obligations |  |  | 1,899 |  |  |  | (1,327 | ) |  |  | — |  |  |  | — |  |  |  | 1,899 |  |  |  | (1,327 | )
Asset-backed securities |  |  | 3,884 |  |  |  | (13 | ) |  |  | 3,884 |  |  |  | (13 | ) |  |  | — |  |  |  | — |
Equity securities |  |  | 262 |  |  |  | (273 | ) |  |  | — |  |  |  | — |  |  |  | 262 |  |  |  | (273 | )
Other securities |  |  | 980 |  |  |  | (20 | ) |  |  | — |  |  |  | — |  |  |  | 980 |  |  |  | (20 | )
Total |  |  | 125,705 |  |  |  | (10,146 | ) |  |  | 104,108 |  |  |  | (4,714 | ) |  |  | 21,597 |  |  |  | (5,432 | )
Investment Securities Held-to-Maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Federal agency obligations |  |  | 11,980 |  |  |  | (34 | ) |  |  | 11,980 |  |  |  | (34 | ) |  |  | — |  |  |  | — |
Collateralized mortgage obligations |  |  | 6,207 |  |  |  | (69 | ) |  |  | 6,207 |  |  |  | (69 | ) |  |  | — |  |  |  | — |
Total |  |  | 18,187 |  |  |  | (103 | ) |  |  | 18,187 |  |  |  | (103 | ) |  |  | — |  |  |  | — |
Total Temporarily Impaired Securities |  | $ | 143,892 |  |  | $ | (10,249 | ) |  | $ | 122,295 |  |  | $ | (4,817 | ) |  | $ | 21,597 |  |  | $ | (5,432 | )

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