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Securities - Amortized cost and fair value of securities available for sale by contractual maturity (Details)
$ in Thousands
Sep. 30, 2016
USD ($)
Amortized Cost  
Due in one year or less $ 580
Due after one year through five years 8,964
Due after five years through ten years 24,328
Due after ten years 118,561
Amortized cost 347,925
Fair Value  
Due in one year or less 583
Due after one year through five years 9,266
Due after five years through ten years 24,024
Due after ten years 120,363
Fair value 352,618
Mortgage-backed securities [Member]  
Amortized Cost  
Amortized cost 142,407
Fair Value  
Fair value 145,110
Other asset backed securities [Member]  
Amortized Cost  
Amortized cost 53,085
Fair Value  
Fair value $ 53,272