Commitments and Contingencies Commitments and Contingencies Disclosure (Details) (USD $)	12 Months Ended
Dec. 31, 2012	Jun. 30, 2013	Jun. 30, 2012
Commitments and Contingencies Disclosure [Abstract]
Litigation Settlement, Expense	$ 3,000,000
Business Acquisition [Line Items]
Assets	9,236,910,000	9,939,573,000	9,599,513,000
Loans Receivable, Net	6,101,749,000	6,868,866,000
Deposits	6,436,117,000	6,628,459,000
Stockholders' Equity Attributable to Parent	1,217,923,000	1,206,336,000
Commerce National Bank [Member]
Business Acquisition [Line Items]
Cash paid		42,900,000
Assets		235,600,000
Loans Receivable, Net		146,700,000
Deposits		204,900,000
Stockholders' Equity Attributable to Parent		$ 29,200,000

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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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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- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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