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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 | 12 Months Ended
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Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | 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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Summary of Unaudited Quarterly Operating Results |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 47,948 | $ 49,640 | $ 50,452 | $ 50,633 | $ 52,619 | $ 53,599 | $ 54,011 | $ 57,474 | $ 58,726 | $ 60,187 | $ 58,723 | $ 57,358 |  |  |
Interest expense | 3,723 | 4,717 | 5,768 | 6,544 | 8,042 | 9,431 | 10,556 | 12,536 | 13,784 | 14,263 | 13,802 | 12,753 |  |  |
Provision (credit) for credit losses on loans | (3,000) | (3,000) | (1,000) | 300 | 1,500 | 4,500 | 6,000 | 3,871 | 650 | 1,950 | 1,600 | 1,950 |  |  |
Provision for unfunded commitments | 1,277 | 643 | (307) | (674) |  |  |  |  |  |  |  |  | $ 939 | $ 0 | $ 0
Net realized gains (losses) on available-for-sale securities |  |  |  |  |  |  | 78 |  | (72) |  |  | 10 | $ 0 | $ 78 | $ (62)
Noninterest income | 9,198 | 9,798 | 9,585 | 9,736 | 9,956 | 9,466 | 8,261 | 7,367 | 7,695 | 8,655 | 7,157 | 7,450 |  |  |
Noninterest expense | 35,784 | 31,339 | 30,191 | 30,321 | 31,073 | 31,988 | 29,349 | 30,815 | 29,535 | 28,725 | 28,383 | 28,495 |  |  |
Provision for income taxes | 4,081 | 5,375 | 5,271 | 5,010 | 4,172 | 3,692 | 3,164 | 2,751 | 4,559 | 4,172 | 3,720 | 3,998 |  |  |
Net income available to common shareholders | $ 15,281 | $ 20,364 | $ 20,114 | $ 18,868 | $ 17,788 | $ 13,454 | $ 13,203 | $ 14,868 | $ 17,893 | $ 19,732 | $ 18,375 | $ 17,612 |  |  |
Earnings per common share - diluted | $ 1.14 | $ 1.49 | $ 1.46 | $ 1.36 | $ 1.28 | $ 0.96 | $ 0.93 | $ 1.04 | $ 1.24 | $ 1.38 | $ 1.28 | $ 1.23 |  |  |

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