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Income Tax (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Reconciliation of Federal Statutory to Actual Tax Expense:    
Federal statutory income tax at 21% $ 7,928 $ 9,609
Tax-exempt interest income (3,022) (2,267)
Share-based compensation 0 (350)
Tax-exempt earnings and gains on life insurance (286) (207)
Tax credits (61) (78)
CARES Act - NOL carryback rate differential (1,178) 0
Other 109 234
Actual Tax Expense $ 3,490 $ 6,941
Effective Tax Rate 9.20% 15.20%