Securities Available for Sale - Amortized cost and fair values of securities available for sale at by contractual maturity (Details 2) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Due in less than one year	$ 4,814
Amortized Cost, Due in one year through five years	76,386
Amortized Cost, Due after five years through ten years	18,591
Amortized Cost, Due after ten years	1,701
Available for sale, Single maturity date, Amortized Cost	101,492
Amortized Cost, Securities for available for sale	158,712	$ 166,785
Fair Value, Due in less than one year	4,857
Fair Value, Due in one year through five years	76,103
Fair Value, Due after five years through ten years	18,537
Fair Value, Due after ten years	1,720
Available for sale, Single maturity date, Fair value	101,217
Fair Value, Securities available for sale	159,687	168,475
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Securities for available for sale	54,478	61,497
Fair Value, Securities available for sale	54,543	61,677
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost, Securities for available for sale	2,742	1,571
Fair Value, Securities available for sale	$ 3,927	$ 2,763