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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, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021
Summary of Unaudited Quarterly Operating Results |  |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 76,482 | $ 75,272 | $ 73,618 | $ 71,463 | $ 67,949 | $ 59,657 | $ 52,698 | $ 46,673 | $ 47,948 | $ 49,640 | $ 50,452 | $ 50,633
Interest expense | 31,335 | 28,534 | 25,480 | 18,271 | 13,330 | 6,759 | 3,867 | 3,407 | 3,723 | 4,717 | 5,768 | 6,544
Provision for credit losses on loans | 750 |  |  | 1,500 | 1,000 | 2,000 |  |  | (3,000) | (3,000) | (1,000) | 300
Provision (credit) for unfunded commitments | (1,689) | (1,195) | (1,619) | (826) | (159) | 1,315 | 2,223 | (193) |  |  |  |
Net realized gain (loss) on available-for-sale securities |  |  |  |  | (168) | 31 |  | 7 | 1,277 | 643 | (307) | (674)
Non-interest income | 6,563 | 7,852 | 7,769 | 7,889 | 7,661 | 7,984 | 9,319 | 9,176 | 9,198 | 9,798 | 9,585 | 9,736
Non-interest expense | 36,285 | 35,557 | 34,718 | 34,463 | 34,336 | 34,758 | 33,004 | 31,268 | 35,784 | 31,339 | 30,191 | 30,321
Provision for income taxes | 3,219 | 4,349 | 4,488 | 5,488 | 4,499 | 4,676 | 4,699 | 4,380 | 4,081 | 5,375 | 5,271 | 5,010
Net income available to common shareholders | $ 13,145 | $ 15,879 | $ 18,320 | $ 20,456 | $ 22,604 | $ 18,133 | $ 18,224 | $ 16,987 | $ 15,281 | $ 20,364 | $ 20,114 | $ 18,868
Earnings per common share - diluted | $ 1.11 | $ 1.33 | $ 1.52 | $ 1.67 | $ 1.84 | $ 1.46 | $ 1.44 | $ 1.30 | $ 1.14 | $ 1.49 | $ 1.46 | $ 1.36

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