Securities Amortized cost and fair value of securities available for sale by contractual maturity (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014
Amortized Cost
Due in one year or less	$ 5,400
Due after one year through five years	29,278
Due after five years through ten years	41,011
Due after ten years	27,492
Total	322,693
Fair Value
Due in one year or less	5,498
Due after one year through five years	30,030
Due after five years through ten years	40,709
Due after ten years	26,559
Total	325,520
Mortgage-backed securities [Member]
Amortized Cost
Total	192,437
Fair Value
Total	195,181
Other asset backed securities [Member]
Amortized Cost
Total	27,007
Fair Value
Total	27,465
Corporate preferred stock [Member]
Amortized Cost
Total	68
Fair Value
Total	$ 78