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Earnings Per Share: Earnings Per Share Reconciliation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Earnings Per Share [Abstract]        
Net income available for common stock $ 33,415 $ 25,161 $ 150,941 $ 121,477
Weighted average shares - basic (in shares) 64,721 62,867 64,643 62,751
Dilutive effect of:        
Equity compensation (in shares) 162 51 179 66
Weighted average shares - diluted (in shares) 64,883 62,918 64,822 62,817
Earnings per share, Basic (usd per share) $ 0.52 $ 0.40 $ 2.33 $ 1.94
Earnings per share, Diluted (usd per share) $ 0.52 $ 0.40 $ 2.33 $ 1.93