| **Income Taxes (Tables)**                         | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
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| **Income Tax Disclosure [Abstract]**              |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| Components of Income Tax Expense                  | The components of income tax expense for the years ended December 31 are as follows: (dollars in thousands) 2013 2012 2011Current:      Federal $— $— $—State — — —Total current taxes — — —Deferred      Federal 21,030 (13,709) (43,001)State 14,655 (2,722) (8,657)Total deferred taxes 35,685 (16,431) (51,658)Increase (decrease) in valuation allowance (34,359) 15,392 52,299Total income tax (benefit) expense - continuing operations $1,326 $(1,039) $641                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Effective Income Tax Rate Reconciliation          | A reconciliation of income tax expense computed at the statutory federal income tax rate to actual income tax expense is presented in the following table as of December 31: (dollars in thousands)        2013 2012 2011Amount of tax computed using Federal statutory tax rate of 35% in all years $(55) $(14,365) $(45,807)Increases (decreases) resulting from effects of:      Non-taxable income (88) (169) (196)State income taxes, net of federal benefit 9,526 (1,769) (5,627)Valuation allowance on deferred tax assets (34,359) 15,392 52,299Reduction of deferred tax assets at Granite  28,293 — —Other (1,991) (128) (28)Total income tax (benefit) expense - continuing operations $1,326 $(1,039) $641                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Components of Deferred Tax Assets and Liabilities | The components of deferred tax assets and liabilities and the tax effect of each are as follows: (dollars in thousands) December 31, 2013 December 31, 2012Deferred tax assets:    Allowance for loan losses $10,364 $11,754Net operating loss 135,050 145,472Compensation and benefit plans 995 805Fair value basis on securities 918 1,199Fair value basis of loans (951) 9,742Fair value basis on deposits — 187Pension and other post-retirement benefits 1,080 2,754Other real estate owned 4,091 16,649Gross unrealized securities losses 10,215 838Interest on nonperforming loans 1,339 1,382Other 529 812Subtotal deferred tax assets 163,630 191,594Less: Valuation allowance (148,043) (182,402)Total deferred tax assets 15,587 9,192Deferred tax liabilities:    Core deposit intangible 2,051 2,673Depreciable basis of premises and equipment 495 721Net deferred loan fees and costs 1,077 1,010Gross unrealized securities gains 1,249 3,220SAB 109 valuation — 2Other 500 728Total deferred tax liabilities 5,372 8,354Net deferred tax assets $10,215 $838 |

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| - Definition
Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319
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| - Definition
Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319
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| - Definition
Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319
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