Fair Value: Schedule of quantitative information about Level 3 Fair Value Measurements on a nonrecurring basis (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation        
Other Real Estate $ 2,331,000 $ 3,663,000 $ 9,283,000 $ 11,465,000
Level 3        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation        
Impaired Financing Receivable, Recorded Investment 30,632,000 42,557,000    
Other Real Estate 2,331,000 3,663,000    
Impaired Loans Receivable and other real estate owned Fair Value Measurement 32,963,000 46,220,000    
Level 3 | Market Approach Valuation Technique | Loans Receivable        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation        
Fair Value $ 30,632,000 $ 42,557,000    
Unobservable Input(s) Appraised value discounted by market or borrower conditions Appraised value discounted by market or borrower conditions    
Level 3 | Market Approach Valuation Technique | Loans Receivable | Minimum        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation        
Fair value of financial instruments, range 0.00% 0.00%    
Level 3 | Market Approach Valuation Technique | Loans Receivable | Maximum        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation        
Fair value of financial instruments, range 0.00% 2.10%    
Level 3 | Market Approach Valuation Technique | Loans Receivable | Weighted Average        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation        
Fair value of financial instruments, range 0.00% 0.30%    
Level 3 | Market Approach Valuation Technique | Other Real Estate Owned        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation        
Fair Value $ 2,331,000 $ 3,663,000    
Unobservable Input(s) Appraised value less selling costs Appraised value less selling costs    
Level 3 | Market Approach Valuation Technique | Other Real Estate Owned | Minimum        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation        
Fair value of financial instruments, range 0.00% 0.00%    
Level 3 | Market Approach Valuation Technique | Other Real Estate Owned | Maximum        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation        
Fair value of financial instruments, range 0.00% 13.60%    
Level 3 | Market Approach Valuation Technique | Other Real Estate Owned | Weighted Average        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation        
Fair value of financial instruments, range 0.00% 1.00%    
Fair Value, Measurements, Nonrecurring [Member]        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation        
Impaired Financing Receivable, Related Allowance $ 309,000 $ 732,000    
Impaired Financing Receivable, Recorded Investment 30,632,000 42,557,000    
Other Real Estate 2,331,000 3,663,000    
Impaired Loans Receivable and other real estate owned Fair Value Measurement $ 32,963,000 $ 46,220,000