Investment Securities - Unrealized Gain (Loss) on Investments (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Fair Value	$ 21,028	$ 134,224
Less Than 12 Months Aggregate Losses, Accumulated In Investments	30	397
Twelve Months or Longer, Fair Value	285	0
12 Months Or Longer, Aggregate Losses Accumulated In Investments	2	0
Fair Value	21,313	134,224
Accumulated In Investments	32	397
U.S. Treasury And Government Sponsored Entities
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Fair Value	19,977	122,560
Less Than 12 Months Aggregate Losses, Accumulated In Investments	21	323
Twelve Months or Longer, Fair Value	0	0
12 Months Or Longer, Aggregate Losses Accumulated In Investments	0	0
Fair Value	19,977	122,560
Accumulated In Investments	21	323
U.S. Agency Mortgage-backed Securities
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Fair Value	172
Less Than 12 Months Aggregate Losses, Accumulated In Investments	6
Twelve Months or Longer, Fair Value	0
12 Months Or Longer, Aggregate Losses Accumulated In Investments	0
Fair Value	172
Accumulated In Investments	6
Municipal Bonds
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Fair Value	879	5,613
Less Than 12 Months Aggregate Losses, Accumulated In Investments	3	54
Twelve Months or Longer, Fair Value	285	0
12 Months Or Longer, Aggregate Losses Accumulated In Investments	2	0
Fair Value	1,164	5,613
Accumulated In Investments	5	54
Corporate Bonds
Schedule of Available-for-sale Securities [Line Items]
Less than Twelve Months, Fair Value		6,051
Less Than 12 Months Aggregate Losses, Accumulated In Investments		20
Twelve Months or Longer, Fair Value		0
12 Months Or Longer, Aggregate Losses Accumulated In Investments		0
Fair Value		6,051
Accumulated In Investments		$ 20