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Parent Company Condensed Financial Information - Statements of Net Income (Details) - USD ($)
$ in Thousands
 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 Income Statements, Captions [Line Items]                      
Total Interest and Dividend Income $ 75,548 $ 76,848 $ 80,479 $ 87,589 $ 82,457 $ 79,813 $ 79,624 $ 78,590 $ 320,464 $ 320,484 $ 289,826
Interest expense on long-term debt                 1,201 1,831 1,129
Income tax benefit 5,702 3,323 (11,793) 2,767 5,091 4,743 5,070 4,222 (1) 19,126 17,845
Net Income $ 24,176 $ 16,705 $ (33,072) $ 13,231 $ 22,269 $ 26,936 $ 26,101 $ 22,929 21,040 98,234 105,334
Parent Company                      
Condensed Income Statements, Captions [Line Items]                      
Dividends from subsidiaries                 59,315 59,490 44,988
Investment income                 0 1 24
Total Interest and Dividend Income                 59,315 59,491 45,012
Interest expense on long-term debt                 1,696 1,285 1,149
Other expenses                 4,464 4,325 3,988
Total Expense                 6,160 5,610 5,137
Income before income tax and undistributed net income of subsidiaries                 53,155 53,881 39,875
Income tax benefit                 (1,315) (1,189) (1,093)
Income before undistributed net income of subsidiaries                 54,470 55,070 40,968
Equity in undistributed net income (distribution in excess of net income) of bank subsidiary                 (27,529) 42,683 68,385
Equity in undistributed net income (distribution in excess of net income) of nonbank subsidiaries                 (5,901) 481 (4,019)
Net Income                 $ 21,040 $ 98,234 $ 105,334