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Parent Company Only Financial Statements - Condensed Statements of Income (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
Condensed Financial Statements, Captions [Line Items]                      
Income tax benefit $ (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
Comprehensive income                 54,005,000 62,776,000 32,431,000
Parent Company [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Dividends from subsidiaries                 29,663,000 38,688,000 21,694,000
Other income                 43,000 12,000 171,000
Total income                 29,706,000 38,700,000 21,865,000
Operating expenses                 4,697,000 4,492,000 5,424,000
Income before income taxes and equity in undistributed earnings of subsidiaries                 25,009,000 34,208,000 16,441,000
Income tax benefit                 1,231,000 1,256,000 1,274,000
Income before equity in undistributed earnings of subsidiaries                 26,240,000 35,464,000 17,715,000
Equity in undistributed earnings of subsidiaries                 19,030,000 12,479,000 18,885,000
Net income                 45,270,000 47,943,000 36,600,000
Other comprehensive income (loss), net of taxes                 8,735,000 14,833,000 (4,169,000)
Comprehensive income                 $ 54,005,000 $ 62,776,000 $ 32,431,000