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Selected Condensed Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
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, 2021
Dec. 31, 2020
Dec. 31, 2019
Summary of selected quarterly financial information                      
Interest income                 $ 93,167 $ 94,818 $ 92,652
Interest expense                 5,435 15,008 25,383
Net interest income                 87,732 79,810 67,269
Provision for loan losses                 (12,400) 29,600 2,300
Noninterest income                 17,101 27,353 14,983
Noninterest expenses                 56,430 53,744 44,473
Income before income tax expense                 60,803 23,819 35,479
Income tax expense                 14,092 5,491 7,621
Net income available to common shareholders                 $ 46,711 $ 18,328 $ 27,858
Earnings per common share                      
Basic                 $ 5.96 $ 2.37 $ 3.70
Diluted                 $ 5.85 $ 2.34 $ 3.58
Weighted average common shares outstanding                      
Basic                 7,843,692 7,718,615 7,528,283
Diluted                 7,988,980 7,824,214 7,772,544
Quarterly Financial Information [Member]                      
Summary of selected quarterly financial information                      
Interest income $ 24,137 $ 23,486 $ 22,731 $ 22,813 $ 23,547 $ 23,415 $ 23,991 $ 23,866      
Interest expense 1,280 1,314 1,301 1,540 2,244 2,778 4,217 5,768      
Net interest income 22,857 22,172 21,430 21,273 21,303 20,637 19,774 18,098      
Provision for loan losses (4,200) (6,000) (1,900) (300) 2,300 11,100 10,200 6,000      
Noninterest income 3,336 4,239 3,622 5,904 6,644 7,584 9,207 3,916      
Noninterest expenses 14,734 14,039 13,495 14,162 14,544 14,183 12,644 12,372      
Income before income tax expense 15,659 18,372 13,457 13,315 11,103 2,938 6,137 3,642      
Income tax expense 3,654 4,355 3,134 2,949 2,502 721 1,459 810      
Net income available to common shareholders $ 12,005 $ 14,017 $ 10,323 $ 10,366 $ 8,601 $ 2,217 $ 4,678 $ 2,832      
Earnings per common share                      
Basic $ 1.52 $ 1.78 $ 1.32 $ 1.33 $ 1.11 $ 0.29 $ 0.61 $ 0.37      
Diluted $ 1.49 $ 1.75 $ 1.29 $ 1.31 $ 1.10 $ 0.28 $ 0.60 $ 0.36      
Weighted average common shares outstanding                      
Basic 7,877,408 7,873,868 7,847,516 7,774,515 7,740,755 7,732,293 7,722,419 7,678,598      
Diluted 8,056,977 8,001,028 7,987,615 7,908,537 7,835,739 7,815,265 7,818,651 7,827,173