Commitments and Contingencies Undisbursed Loan Balances (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Other Commitments [Line Items]
Loans and Leases Receivable, Commitments to Purchase or Sell	$ 28,485,000	$ 14,760,000
Letters of Credit Outstanding, Amount	18,000,000	17,000,000
Line of Credit Facility, Commitment Fee Amount	180,000	153,000
Construction Loans
Other Commitments [Line Items]
Loans and Leases Receivable, Loans in Process	16,499,000	17,617,000
Commercial
Other Commitments [Line Items]
Loans and Leases Receivable, Loans in Process	524,065,000	309,560,000
Consumer
Other Commitments [Line Items]
Loans and Leases Receivable, Loans in Process	$ 399,691,000	$ 403,112,000