Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified		6 Months Ended			6 Months Ended
	Jun. 30, 2013 Plantiff charge_count	Jun. 30, 2013 Maximum	Jun. 30, 2013 Minimum	Jun. 30, 2013 Distinctive Notes lawsuit	Jun. 30, 2013 Roseman v. Martin Sigillito Minimum	Jun. 30, 2013 BJD, LLC and Barbara Dunning v. Enterprise Financial	Jun. 30, 2013 Commitments to extend credit	Dec. 31, 2012 Commitments to extend credit	Jun. 30, 2013 Standby letters of credit	Dec. 31, 2012 Standby letters of credit	Jun. 30, 2013 Unadvanced Commitment on Impaired Loan	Jun. 30, 2013 Fixed Rate Loan Commitment Commitments to extend credit	Dec. 31, 2012 Fixed Rate Loan Commitment Commitments to extend credit
Schedule of Commitments [Line Items]
Loans and Leases Receivable, Impaired Loans, Commitment to Lend											$ 1,728
Estimated losses attributable to unadvanced commitments on impaired loans											259
Off-balance sheet financial instruments, contractual amounts							742,387	722,325	44,636	42,561		33,400	50,700
Remaining term of letters of credit		5 years	6 months
Number of lawsuits, bank as defendant	41			2
Loss contingency, damages sought, value					$ 44,000	$ 800
Interest rate on damages sought						9.00%
Number of counts found guilty	20