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Parent Company Financial Information - Income Statement (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Condensed Income Statements, Captions [Line Items]      
Gain on sale of investment securities $ 2,964 $ 1,815 $ 1,517
Interest expense 39,982 68,424 105,585
Legal and professional 11,510 16,406 12,195
Other 12,610 14,680 15,994
Income (Loss) Before Income Tax (Benefit) and Equity in Undistributed Income of Subsidiaries 237,674 176,145 196,791
Income Tax Benefit 60,983 43,928 53,848
Net Income 176,691 132,217 142,943
Parent Company      
Condensed Income Statements, Captions [Line Items]      
Other interest and dividends 170,741 141,982 85,851
Gain on sale of investment securities 93 0 0
Other Operating Income (Expense), Net (46) 0 0
Total Income 170,788 141,982 85,851
Interest expense 9,993 11,915 11,916
Legal and professional 2,617 2,842 2,779
Directors compensation 589 500 491
Other 1,251 1,306 1,294
Total Expenses 14,450 16,563 16,480
Income (Loss) Before Income Tax (Benefit) and Equity in Undistributed Income of Subsidiaries 156,338 125,419 69,371
Income Tax Benefit (2,903) (607) (3,176)
Income (Loss) Before Equity in Undistributed Income of Subsidiaries 159,242 126,026 72,547
Equity in Undistributed Income of Subsidiaries 17,449 6,191 70,396
Net Income $ 176,691 $ 132,217 $ 142,943