Fair Value: Schedule of balances of assets and liabilities, measured at fair value on a non-recurring basis (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
OREO, Fair Value $ 2,331,000 $ 3,663,000 $ 9,283,000 $ 11,465,000
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 30,632,000 42,557,000    
OREO, Fair Value 2,331,000 3,663,000    
Total, Fair Value 32,963,000 46,220,000    
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 30,632,000 42,557,000    
OREO, Fair Value 2,331,000 3,663,000    
Total, Fair Value 32,963,000 46,220,000    
Impaired loans (included in loans receivable, net), Fair Value $ 309,000 $ 732,000