Loans and reserve for credit losses (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase (Decrease) in Finance Receivables	$ 138,100,000
Percentage Of Real Estate Related Loans	71.00%
Loans participated to third-parties	11,300,000		12,700,000
Customer Payoff Paydown Loans Restructure And Foreclosure Of Loans	90,500,000	68,500,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	1,083,000		1,533,000
Impaired loans,Total recorded balance	40,467,000		68,671,000
Loans and Leases Receivable, Allowance	20,857,000		27,261,000
Troubled Debt Restructuring
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired loans,Total recorded balance	33,200,000		43,600,000
Loans and Leases Receivable, Allowance	800,000		2,700,000
Loans and Leases Receivable, Impaired, Commitment to Lend	$ 0		$ 1,000,000