Securities - Summary of Securities that had Unrealized Losses (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Fair Value	$ 126,804	$ 45,553
Less than 12 Months, Aggregate Losses	(7,051)	(338)
Twelve Months or Longer, Fair Value	12,979	0
Twelve Months or Longer, Unrealized Losses	(287)	0
Total, Fair Value	139,783	45,553
Total, Unrealized Losses	(7,338)	(338)
U.S. Government agencies and corporations
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Fair Value	66,879
Less than 12 Months, Aggregate Losses	(5,220)
Twelve Months or Longer, Fair Value	0
Twelve Months or Longer, Unrealized Losses	0
Total, Fair Value	66,879
Total, Unrealized Losses	(5,220)
Mortgage backed securities
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Fair Value	43,533	44,491
Less than 12 Months, Aggregate Losses	(1,020)	(328)
Twelve Months or Longer, Fair Value	12,979	0
Twelve Months or Longer, Unrealized Losses	(287)	0
Total, Fair Value	56,512	44,491
Total, Unrealized Losses	(1,307)	(328)
Collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Fair Value	6,665
Less than 12 Months, Aggregate Losses	197
Twelve Months or Longer, Fair Value	0
Twelve Months or Longer, Unrealized Losses	0
Total, Fair Value	6,665
Total, Unrealized Losses	197
State and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Fair Value	9,727	1,062
Less than 12 Months, Aggregate Losses	(614)	(10)
Twelve Months or Longer, Fair Value	0	0
Twelve Months or Longer, Unrealized Losses	0	0
Total, Fair Value	9,727	1,062
Total, Unrealized Losses	$ (614)	$ (10)