Securities (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 item
Number of Securities
Unrealized loss for less than twelve months	7
Total	7
Fair Value
Unrealized loss for less than twelve months	$ 83,799
Total	83,799
Unrealized Losses
Unrealized loss for less than twelve months	439
Total	439
U.S. Treasury securities
Number of Securities
Unrealized loss for less than twelve months	1
Total	1
Fair Value
Unrealized loss for less than twelve months	25,002
Total	25,002
Unrealized Losses
Unrealized loss for less than twelve months	6
Total	6
Collateralized mortgage obligations
Number of Securities
Unrealized loss for less than twelve months	2
Total	2
Fair Value
Unrealized loss for less than twelve months	56,898
Total	56,898
Unrealized Losses
Unrealized loss for less than twelve months	430
Total	430
States and political subdivisions
Number of Securities
Unrealized loss for less than twelve months	4
Total	4
Fair Value
Unrealized loss for less than twelve months	1,899
Total	1,899
Unrealized Losses
Unrealized loss for less than twelve months	3
Total	$ 3