Securities - Summary of Securities that had Unrealized Losses (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Fair Value	$ 132,595	$ 45,553
Less than 12 Months, Aggregate Losses	(4,149)	(338)
Twelve Months or Longer, Fair Value	1,796	0
Twelve Months or Longer, Unrealized Losses	(36)	0
Total, Fair Value	134,391	45,553
Total, Unrealized Losses	(4,185)	(338)
U.S. Government agencies and corporations
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Fair Value	64,076
Less than 12 Months, Aggregate Losses	(2,671)
Twelve Months or Longer, Fair Value	0
Twelve Months or Longer, Unrealized Losses	0
Total, Fair Value	64,076
Total, Unrealized Losses	(2,671)
Mortgage backed securities
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Fair Value	56,567	44,491
Less than 12 Months, Aggregate Losses	(948)	(328)
Twelve Months or Longer, Fair Value	1,796	0
Twelve Months or Longer, Unrealized Losses	(36)	0
Total, Fair Value	58,363	44,491
Total, Unrealized Losses	(984)	(328)
Collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Fair Value	2,576
Less than 12 Months, Aggregate Losses	65
Twelve Months or Longer, Fair Value	0
Twelve Months or Longer, Unrealized Losses	0
Total, Fair Value	2,576
Total, Unrealized Losses	65
State and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Fair Value	9,376	1,062
Less than 12 Months, Aggregate Losses	(465)	(10)
Twelve Months or Longer, Fair Value	0	0
Twelve Months or Longer, Unrealized Losses	0	0
Total, Fair Value	9,376	1,062
Total, Unrealized Losses	$ (465)	$ (10)