Fair Value: Schedule of balances of assets and liabilities, measured at fair value on a non-recurring basis (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
OREO, Fair Value	$ 3,663,000	$ 9,283,000	$ 11,465,000	$ 17,347,000
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans (included in loans receivable, net), recorded investment	42,557,000	54,444,000
OREO, Fair Value	3,663,000	9,283,000
Total, Fair Value	46,220,000	63,727,000
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans (included in loans receivable, net), recorded investment	42,557,000	54,444,000
OREO, Fair Value	3,663,000	9,283,000
Total, Fair Value	46,220,000	63,727,000
Impaired loans (included in loans receivable, net), Fair Value	$ 732,000	$ 1,200,000