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Income Taxes (Reconciliation Of The Significant Differences Between The Federal Statutory Income Tax Rate And Effective Income Tax Rate) (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
Income Tax Disclosure [Abstract]                      
Computed federal taxes at statutory rate                 $ 23,376 $ 23,832 $ 18,483
State income taxes, net of federal tax benefit                 2,070 2,376 1,730
Tax effects of:                      
Tax-exempt interest income                 (944) (733) (694)
Bank-owned life insurance                 (929) (791) (649)
Income tax credits                 (1,113) (889) (575)
Other items, net                 (743) 340 (280)
Income tax expense $ 4,565 $ 5,098 $ 4,732 $ 7,322 $ 6,319 $ 6,193 $ 5,813 $ 5,810 $ 21,717 $ 24,135 $ 18,015