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Summary of Unaudited Quarterly Operating Results: Schedule of Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018
Summary of Unaudited Quarterly Operating Results |  |  |  |  |  |  |  |  |  |  |  |
Interest Income | $ 52,619 | $ 53,599 | $ 54,011 | $ 57,474 | $ 58,726 | $ 60,187 | $ 58,723 | $ 57,358 | $ 56,142 | $ 52,982 | $ 49,943 | $ 46,882
Interest expense | 8,042 | 9,431 | 10,556 | 12,536 | 13,784 | 14,263 | 13,802 | 12,753 | 11,585 | 9,997 | 8,731 | 7,444
Provision for loan losses | 1,500 | 4,500 | 6,000 | 3,871 | 650 | 1,950 | 1,600 | 1,950 | 1,950 | 1,300 | 1,950 | 1,950
Net realized gains (losses) on available-for-sale securities |  |  | 78 |  | (72) |  |  | 10 |  | 2 |  |
Noninterest income | 9,956 | 9,466 | 8,261 | 7,367 | 7,695 | 8,655 | 7,157 | 7,450 | 7,220 | 14,604 | 7,459 | 6,935
Noninterest expense | 31,073 | 31,988 | 29,349 | 30,815 | 29,535 | 28,725 | 28,383 | 28,495 | 28,774 | 28,309 | 29,915 | 28,312
Provision for income taxes | 4,172 | 3,692 | 3,164 | 2,751 | 4,559 | 4,172 | 3,720 | 3,998 | 3,765 | 5,464 | 2,967 | 2,645
Net income available to common shareholders | $ 17,788 | $ 13,454 | $ 13,203 | $ 14,868 | $ 17,893 | $ 19,732 | $ 18,375 | $ 17,612 | $ 17,288 | $ 22,516 | $ 13,839 | $ 13,466
Earnings per common share - diluted | $ 1.28 | $ 0.96 | $ 0.93 | $ 1.04 | $ 1.24 | $ 1.38 | $ 1.28 | $ 1.23 | $ 1.21 | $ 1.57 | $ 0.97 | $ 0.95

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