Other Borrowed Funds (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Other borrowed funds disclosures
Borrowings outstanding	$ 77,167	$ 52,191
Federal Home Loan Bank Advances [Member]
Other borrowed funds disclosures
Total borrowing capacity available	392,600	367,200
Borrowings outstanding	67,309	$ 47,586
Average interest rate of outstanding balances		0.25%
Federal Reserve Bank Advances [Member]
Other borrowed funds disclosures
Borrowings outstanding	0	$ 0
Available borrowing capacity	246,500	377,300
Securities Sold under Agreements to Repurchase [Member]
Other borrowed funds disclosures
Borrowings outstanding	9,858	4,605
Federal Funds Purchased [Member]
Other borrowed funds disclosures
Federal Funds purchased outstanding	$ 0	$ 0