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Investment Securities - Amortized Cost and Fair Value (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Scheduled of amortized cost and fair value of securities pledged as collateral    
Amortized Cost $ 251,139 $ 229,189
Fair Value 260,579 232,917
Other securities pledged    
Scheduled of amortized cost and fair value of securities pledged as collateral    
Amortized Cost 33,583 19,333
Fair Value 34,697 19,850
Washington and Oregon State to Secure Public Deposits [Member]    
Scheduled of amortized cost and fair value of securities pledged as collateral    
Amortized Cost 188,233 187,700
Fair Value 196,117 190,773
Repurchase Agreements [Member]    
Scheduled of amortized cost and fair value of securities pledged as collateral    
Amortized Cost 29,323 22,156
Fair Value $ 29,765 $ 22,294