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Income Tax (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Reconciliation of Federal Statutory to Actual Tax Expense:    
Federal statutory income tax at 21% $ 12,268 $ 7,928
Tax-exempt interest income (3,706) (3,022)
Share-based compensation (59) 0
Tax-exempt earnings and gains on life insurance (281) (286)
Tax credits (73) (61)
CARES Act - NOL carryback rate differential 0 (1,178)
State Income Tax 702 86
Other 101 23
Actual Tax Expense $ 8,952 $ 3,490
Effective Tax Rate 15.30% 9.20%