Investment Securities - Unrealized Gain (Loss) on Investments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Fair Value	$ 92,336	$ 134,224
Less Than 12 Months Aggregate Losses, Accumulated In Investments	338	397
Twelve Months or Longer, Fair Value	3,090	0
12 Months Or Longer, Aggregate Losses Accumulated In Investments	52	0
Fair Value	95,426	134,224
Accumulated In Investments	390	397
U.S Treasury And Government Sponsored Entities
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Fair Value	90,336	122,560
Less Than 12 Months Aggregate Losses, Accumulated In Investments	332	323
Twelve Months or Longer, Fair Value	0	0
12 Months Or Longer, Aggregate Losses Accumulated In Investments	0	0
Fair Value	90,336	122,560
Accumulated In Investments	332	323
Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Fair Value	0	5,613
Less Than 12 Months Aggregate Losses, Accumulated In Investments	0	54
Twelve Months or Longer, Fair Value	3,090	0
12 Months Or Longer, Aggregate Losses Accumulated In Investments	52	0
Fair Value	3,090	5,613
Accumulated In Investments	52	54
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Fair Value	2,000	6,051
Less Than 12 Months Aggregate Losses, Accumulated In Investments	6	20
Twelve Months or Longer, Fair Value	0	0
12 Months Or Longer, Aggregate Losses Accumulated In Investments	0	0
Fair Value	2,000	6,051
Accumulated In Investments	$ 6	$ 20