Securities - Amortized cost and fair value of securities available for sale by contractual maturity (Details) $ in Thousands	Sep. 30, 2015 USD ($)
Amortized Cost
Due in one year or less	$ 320
Due after one year through five years	10,639
Due after five years through ten years	25,868
Due after ten years	123,027
Total	367,562
Fair Value
Due in one year or less	321
Due after one year through five years	11,067
Due after five years through ten years	25,675
Due after ten years	124,162
Total	372,779
Mortgage-backed securities [Member]
Amortized Cost
Total	152,750
Fair Value
Total	156,566
Other asset backed securities [Member]
Amortized Cost
Total	54,958
Fair Value
Total	$ 54,988