Loans and the Allowance for Credit Losses (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of recorded Investment in loans by category
Total portfolio loans	$ 3,683,801	$ 3,687,762
Loans held for sale	14,299	21,903
Total loans	3,698,100	3,709,665
Commercial real estate land and construction [Member]
Schedule of recorded Investment in loans by category
Total portfolio loans	184,802	193,004
Commercial real estate improved property [Member]
Schedule of recorded Investment in loans by category
Total portfolio loans	1,646,952	1,665,341
Commercial real estate [Member]
Schedule of recorded Investment in loans by category
Total portfolio loans	1,831,754	1,858,345
Commercial and industrial [Member]
Schedule of recorded Investment in loans by category
Total portfolio loans	495,748	478,025
Residential real estate [Member]
Schedule of recorded Investment in loans by category
Total portfolio loans	808,528	793,702
Home equity [Member]
Schedule of recorded Investment in loans by category
Total portfolio loans	278,812	277,226
Consumer [Member]
Schedule of recorded Investment in loans by category
Total portfolio loans	$ 268,959	$ 280,464

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References+ Details

The aggregate carrying amount of loans receivable that will be sold to other entities. Includes mortgage and all other loans (collectively, loans) not classified as held for investment. Such loans are stated at the lower of cost or market, or elected fair value. Mortgage loans exclude mortgage-backed securities which are considered a debt security (other loan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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+ Details