Investment Securities - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	$ 46,700	$ 173,912
Less than 12 months, unrealized losses	262	977
More than 12 months, fair value	523	136
More than 12 months, unrealized losses	4	2
Fair Value	47,223	174,048
Accumulated In Investments	266	979
U.S. Treasury and government sponsored entities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	23,463	146,433
Less than 12 months, unrealized losses	25	829
More than 12 months, fair value	523	36
More than 12 months, unrealized losses	4	1
Fair Value	23,986	146,469
Accumulated In Investments	29	830
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	19,051	19,874
Less than 12 months, unrealized losses	162	88
More than 12 months, fair value	0	0
More than 12 months, unrealized losses	0	0
Fair Value	19,051	19,874
Accumulated In Investments	162	88
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	2,694	4,454
Less than 12 months, unrealized losses	18	18
More than 12 months, fair value	0	0
More than 12 months, unrealized losses	0	0
Fair Value	2,694	4,454
Accumulated In Investments	18	18
Mortgage-backed Securities
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value		637
Less than 12 months, unrealized losses		9
More than 12 months, fair value		100
More than 12 months, unrealized losses		1
Fair Value		737
Accumulated In Investments		10
Preferred stock
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, fair value	1,492	2,514
Less than 12 months, unrealized losses	57	33
More than 12 months, fair value	0	0
More than 12 months, unrealized losses	0	0
Fair Value	1,492	2,514
Accumulated In Investments	$ 57	$ 33