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Investments (Aggregate Carrying And Approximate Market Values Of Available-For-Sale Securities) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Document Period End Date Dec. 31, 2019  
Securities available-for-sale, amortized cost $ 794,117 $ 732,853
Available-for-sale debt securities, accumulated gross unrealized gain, before tax 18,210 3,153
Available-for-sale debt securities, accumulated gross unrealized loss, before tax 2,221 14,210
Securities available-for-sale 810,106 721,796
U.S. Government agencies    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, amortized cost 500 5,713
Available-for-sale debt securities, accumulated gross unrealized gain, before tax 2 20
Available-for-sale debt securities, accumulated gross unrealized loss, before tax 0 0
Securities available-for-sale 502 5,733
Obligations of states and political subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, amortized cost 112,393 128,089
Available-for-sale debt securities, accumulated gross unrealized gain, before tax 4,800 1,033
Available-for-sale debt securities, accumulated gross unrealized loss, before tax 6 1,052
Securities available-for-sale 117,187 128,070
U.S. Government agencies    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, amortized cost 631,637 561,799
Available-for-sale debt securities, accumulated gross unrealized gain, before tax 12,292 1,950
Available-for-sale debt securities, accumulated gross unrealized loss, before tax 1,825 12,991
Securities available-for-sale 642,104 550,758
Private label    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, amortized cost 10,896 11,948
Available-for-sale debt securities, accumulated gross unrealized gain, before tax 589 95
Available-for-sale debt securities, accumulated gross unrealized loss, before tax 0 0
Securities available-for-sale 11,485 12,043
Trust preferred securities    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, amortized cost 4,781 4,774
Available-for-sale debt securities, accumulated gross unrealized gain, before tax 27 25
Available-for-sale debt securities, accumulated gross unrealized loss, before tax 347 0
Securities available-for-sale 4,461 4,799
Corporate securities    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, amortized cost 31,669 16,795
Available-for-sale debt securities, accumulated gross unrealized gain, before tax 500 30
Available-for-sale debt securities, accumulated gross unrealized loss, before tax 43 167
Securities available-for-sale 32,126 16,658
Debt Securities    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, amortized cost 791,876 729,118
Available-for-sale debt securities, accumulated gross unrealized gain, before tax 18,210 3,153
Available-for-sale debt securities, accumulated gross unrealized loss, before tax 2,221 14,210
Securities available-for-sale 807,865 718,061
Certificates of Deposit    
Debt Securities, Available-for-sale [Line Items]    
Securities available-for-sale, amortized cost 2,241 3,735
Available-for-sale debt securities, accumulated gross unrealized gain, before tax 0 0
Available-for-sale debt securities, accumulated gross unrealized loss, before tax 0 0
Securities available-for-sale $ 2,241 $ 3,735