4. Investment Securities: Schedule of Unrealized Loss on Investments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	6	5
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 1,236	$ 999
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(12)	(5)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	1,236	999
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	(12)	(5)
US Government Agencies Debt Securities
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	3	3
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	745	746
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(5)	(4)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	745	746
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	(5)	(4)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	3	2
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	491	253
Held-to-maturity Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Losses	(7)	(1)
Held-to-maturity Securities, Continuous Unrealized Loss Position, Fair Value	491	253
Held-to-maturity Securities, Continuous Unrealized Loss Position, Aggregate Losses	$ (7)	$ (1)