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Parent Company Only Financial Statements - Condensed Statements of Income (Details) - USD ($)
 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
Condensed Financial Statements, Captions [Line Items]                      
Income tax benefit $ (5,168,000) $ (6,105,000) $ (3,357,000) $ (668,000) $ (4,484,000) $ (3,720,000) $ (3,096,000) $ (3,172,000) $ (15,298,000) $ (14,472,000) $ (15,323,000)
Net income $ 16,834,000 $ 18,326,000 $ 12,221,000 $ 4,109,000 $ 13,569,000 $ 11,565,000 $ 10,137,000 $ 9,999,000 51,490,000 45,270,000 47,943,000
Comprehensive income                 33,564,000 54,005,000 62,776,000
Parent Company [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Dividends from subsidiaries                 28,075,000 29,663,000 38,688,000
Other income                 9,000 43,000 12,000
Total income                 28,084,000 29,706,000 38,700,000
Operating expenses                 9,630,000 4,697,000 4,492,000
Income before income taxes and equity in undistributed earnings of subsidiaries                 18,454,000 25,009,000 34,208,000
Income tax benefit                 2,656,000 1,231,000 1,256,000
Income before equity in undistributed earnings of subsidiaries                 21,110,000 26,240,000 35,464,000
Equity in undistributed earnings of subsidiaries                 30,380,000 19,030,000 12,479,000
Net income                 51,490,000 45,270,000 47,943,000
Other comprehensive income (loss), net of taxes                 (17,926,000) 8,735,000 14,833,000
Comprehensive income                 $ 33,564,000 $ 54,005,000 $ 62,776,000