Basis of Presentation (Pending Acquisitions) (Details) (USD $)	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Jun. 12, 2013 Morrill & Janes Bank and Trust Company	Mar. 31, 2013 Morrill & Janes Bank and Trust Company
Business Acquisition [Line Items]
Assets	$ 4,959,756,000	$ 4,990,553,000	$ 4,427,684,000		$ 751,000,000
Loans and Leases Receivable, Net Amount	2,801,029,000	2,790,087,000			366,000,000
Business Combination, Consideration Transferred				$ 61,500,000

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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This element represents the acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer.

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- Definition

Amount after allowance and 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.

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