Loans Receivable (Details Textual 2) (USD $)	9 Months Ended							3 Months Ended	9 Months Ended			3 Months Ended		9 Months Ended
	Sep. 30, 2013 Commercial and industrial [Member] Contract	Sep. 30, 2013 Troubled Debt Restructured Loans [Member] Loan	Sep. 30, 2012 Troubled Debt Restructured Loans [Member] Loan	Dec. 31, 2012 Previously Reported as TDR [Member] Troubled Debt Restructured Loans [Member]	Dec. 31, 2012 Not Previously Reported as TDR [Member] Troubled Debt Restructured Loans [Member]	Sep. 30, 2013 Originated TDRs [Member]	Dec. 31, 2012 Originated TDRs [Member]	Sep. 30, 2012 Originated TDRs [Member] Commercial and industrial [Member] Contract	Sep. 30, 2012 Originated TDRs [Member] Commercial and industrial [Member] Contract	Sep. 30, 2013 Purchased Other TDRs [Member]	Dec. 31, 2012 Purchased Other TDRs [Member]	Sep. 30, 2013 Purchased Other TDRs [Member] Commercial and industrial [Member] Contract	Sep. 30, 2012 Purchased Other TDRs [Member] Commercial and industrial [Member] Contract	Sep. 30, 2013 Purchased Other TDRs [Member] Commercial and industrial [Member] Contract	Sep. 30, 2012 Purchased Other TDRs [Member] Commercial and industrial [Member] Contract
Loans Receivable (Textual) [Abstract]
Unfunded commitment to borrowers related to originated TDR						$ 4,500,000	$ 1,500,000			$ 243,000,000	$ 0
Financing receivable modification, number of contracts		52	27
Financing receivables pre-modification, number of contracts		12	9
Financing receivables modifications with prior TDR status balance		4,800,000	2,400,000
Principal balance, modified TDRs	702,000
Valuation allowance for TDRs		1,500,000		501,000	240,000
TDRs subsequently defaulted, number of contracts	2							0	0			0	0	0	0
Reserve for defaulted TDRs	$ 52,000