Other Borrowed Funds (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other borrowed funds disclosures
Borrowings outstanding	$ 226,338	$ 52,191
Average interest rate of outstanding balances	0.46%	0.25%
Federal Home Loan Bank Advances [Member]
Other borrowed funds disclosures
Total borrowing capacity available	$ 355,100	$ 367,200
Borrowings outstanding	223,265	47,586
Federal Reserve Bank Advances [Member]
Other borrowed funds disclosures
Borrowings outstanding		0	$ 0
Available borrowing capacity	243,900	377,300
Securities Sold under Agreements to Repurchase [Member]
Other borrowed funds disclosures
Borrowings outstanding	$ 3,073	4,605
Federal Funds Purchased [Member]
Other borrowed funds disclosures
Federal Funds purchased outstanding		$ 0	$ 0