Other borrowings (Narrative) (Details) (USD $)	1 Months Ended		12 Months Ended
	Jun. 30, 2013	Sep. 30, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Debt Disclosure [Abstract]
Borrowing Capacity as a Percent of Total Assets			20.00%
FHLB borrowings outstanding Total			$ 27,000,000	$ 60,000,000
Federal Home Loan Bank Advances General Debt Obligations Disclosures Prepayment	60,000,000
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Weighted Average Interest Rate	3.17%		0.25%
Prepayment Penalties		500,000	3,827,000	0	1,291,000
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available			253,900,000
Federal Home Loan Bank, Advances, Maturities Summary, Due in Next Twelve Months			27,000,000
FRB Line of Credit Facility, Amount Outstanding			0
Federal Reserves Bank Undrawn Borrowing Capacity			12,200,000
Repayments of Unsecured Debt		41,000,000
Charge Off Percentage			1.00%
Federal Funds Borrowing Agreements with Correspondent Banks, Maximum Borrowing Capacity			90,000,000
Federal Funds Borrowing Agreements with Correspondent Banks, Outstanding Borrowings			$ 0