Mortgage-backed Securities: Schedule of Temporarily Impaired Mortgage-backed securities, Fair Value and Unrealized Losses (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013
FHLMC mortgage-backed securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 1,877
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(85)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	1,877
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(85)
FNMA mortgage-backed securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	3,729
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(233)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	3,729
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	(233)
Mortgage-backed
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	5,606
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(318)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	5,606
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses	$ (318)