Investment Securities: Schedule of Gross Unrealized and Fair Value Aggregated by Investment Category (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Less than 12 months | Fair Value
Collateralized mortgage obligations		$ 3,760
Mortgage-backed securities	13,973	61,720
Small Business Administration Loan Pools	9,876
Total securities by investment category	23,849	71,916
States and political subdivisions		6,436
Less than 12 months | Unrealized Losses
Collateralized mortgage obligations		(110)
Mortgage-backed securities	(29)	(365)
Small Business Administration Loan Pools	(11)
Total securities by investment category	(40)	(519)
States and political subdivisions		(44)
12 Months or More | Fair Value
Collateralized mortgage obligations	1,124	1,460
Mortgage-backed securities	17,629	91,824
Total securities by investment category	18,753	100,665
States and political subdivisions		7,381
12 Months or More | Unrealized Losses
Collateralized mortgage obligations	(239)	(270)
Mortgage-backed securities	(46)	(437)
Total securities by investment category	(285)	(1,566)
States and political subdivisions		(859)
Total Investments | Fair Value
Collateralized mortgage obligations	1,124	5,220
Mortgage-backed securities	31,602	153,544
Small Business Administration Loan Pools	9,876
Total securities by investment category	42,062	172,581
States and political subdivisions		13,817
Total Investments | Unrealized Losses
Collateralized mortgage obligations	(239)	(380)
Mortgage-backed securities	(75)	(802)
Small Business Administration Loan Pools	(11)
Total securities by investment category	(325)	(2,085)
States and political subdivisions		$ (903)