| **Commitments and Letters of Credit (Tables)**                  | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                 |
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| **Commitments and Contingencies Disclosure [Abstract]**         |                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| Notional Amount of Commitments and Letter of Credit Instruments | The following table identifies the notional amount of those instruments at December 31: 2013 2012 (dollars in thousands)Financial instruments whose contract amounts represent credit risk:   Commitments to extend credit$1,571,987 $1,506,618Financial standby letters of credit38,121 47,185Performance standby letters of credit32,441 69,240Commercial letters of credit— 685 |

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| - Definition
Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5
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