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Quarterly Financial Data - Unaudited - Summary of Quarterly Data (Details) - USD ($)
 3 Months Ended 12 Months Ended
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, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Data [Abstract]                      
Interest income $ 37,570,000 $ 36,295,000 $ 35,535,000 $ 34,741,000 $ 36,521,000 $ 37,578,000 $ 37,571,000 $ 38,051,000 $ 144,141,000 $ 149,721,000 $ 124,565,000
Interest expense 4,130,000 3,778,000 3,953,000 4,868,000 5,537,000 6,453,000 6,258,000 5,799,000 16,729,000 24,047,000 12,827,000
Net interest income 33,440,000 32,517,000 31,582,000 29,873,000 30,984,000 31,125,000 31,313,000 32,252,000 127,412,000 125,674,000 111,738,000
Provision for loan losses 603,000 3,883,000 6,136,000 5,481,000 2,737,000 2,658,000 91,000 947,000 16,103,000 6,433,000 8,667,000
Net interest income after provision for loan losses 32,837,000 28,634,000 25,446,000 24,392,000 28,247,000 28,467,000 31,222,000 31,305,000 111,309,000 119,241,000 103,071,000
Other income 15,547,000 13,578,000 13,885,000 16,510,000 14,873,000 12,917,000 13,588,000 14,639,000 59,520,000 56,017,000 35,414,000
Other expense 30,331,000 26,927,000 26,098,000 27,731,000 27,601,000 25,894,000 30,187,000 28,310,000 111,087,000 111,992,000 89,980,000
Income before income taxes 18,053,000 15,285,000 13,233,000 13,171,000 15,519,000 15,490,000 14,623,000 17,634,000 59,742,000 63,266,000 48,505,000
Income taxes 4,484,000 3,720,000 3,096,000 3,172,000 3,543,000 3,820,000 3,642,000 4,318,000 14,472,000 15,323,000 11,905,000
Net income $ 13,569,000 $ 11,565,000 $ 10,137,000 $ 9,999,000 $ 11,976,000 $ 11,670,000 $ 10,981,000 $ 13,316,000 $ 45,270,000 $ 47,943,000 $ 36,600,000
Basic earnings per common share $ 0.81 $ 0.69 $ 0.61 $ 0.60 $ 0.72 $ 0.70 $ 0.66 $ 0.80 $ 2.71 $ 2.88 $ 2.53
Diluted earnings per common share $ 0.81 $ 0.69 $ 0.60 $ 0.60 $ 0.72 $ 0.70 $ 0.66 $ 0.80 $ 2.70 $ 2.87 $ 2.52