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Investment Securities (Schedule Of Investment Securities Classified As Available-for-sale And Held-to-maturity) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Available-for-sale [Abstract]    
Amortized cost $ 1,311,627 $ 1,254,899
Gross unrealized gains 11,231 2,228
Gross unrealized losses (2,166) (20,803)
Fair value 1,320,692 1,236,324
Held-to-maturity [Abstract]    
Amortized cost 84,387 84,432
Gross unrealized gains 682 849
Gross unrealized losses (2,067) (1,890)
Fair value 83,002 83,391
U.S. Government Agency Securities [Member]    
Available-for-sale [Abstract]    
Amortized cost 52,415 54,095
Gross unrealized gains 672 146
Gross unrealized losses (177) (879)
Fair value 52,910 53,362
Asset-backed Securities [Member]    
Available-for-sale [Abstract]    
Amortized cost 244,751 189,850
Gross unrealized gains 132 104
Gross unrealized losses (534) (1,352)
Fair value 244,349 188,602
Federally insured student loan securities [Member]    
Available-for-sale [Abstract]    
Amortized cost 33,852 59,705
Gross unrealized gains 10 87
Gross unrealized losses (323) (283)
Fair value 33,539 59,509
Collateralized Loan Obligations Securities [Member]    
Available-for-sale [Abstract]    
Amortized cost 210,899 125,045
Gross unrealized gains 122  
Gross unrealized losses (211) (1,069)
Fair value 210,810 123,976
Asset-backed Securities, Other [Member]    
Available-for-sale [Abstract]    
Amortized cost   5,100
Gross unrealized gains   17
Fair value   5,117
Tax-exempt Obligations Of States And Political Subdivisions [Member]    
Available-for-sale [Abstract]    
Amortized cost 5,174 7,546
Gross unrealized gains 144 50
Gross unrealized losses   (45)
Fair value 5,318 7,551
Taxable obligations of states and political subdivisions [Member]    
Available-for-sale [Abstract]    
Amortized cost 58,258 60,152
Gross unrealized gains 1,992 803
Gross unrealized losses   (520)
Fair value 60,250 60,435
Residential Mortgage-backed Securities [Member]    
Available-for-sale [Abstract]    
Amortized cost 335,068 377,199
Gross unrealized gains 2,629 648
Gross unrealized losses (1,101) (8,106)
Fair value 336,596 369,741
Collateralized Mortgage Obligation Securities [Member]    
Available-for-sale [Abstract]    
Amortized cost 221,109 265,914
Gross unrealized gains 1,826 287
Gross unrealized losses (208) (3,994)
Fair value 222,727 262,207
Commercial Mortgage-backed Securities [Member]    
Available-for-sale [Abstract]    
Amortized cost 394,852 300,143
Gross unrealized gains 3,836 190
Gross unrealized losses (146) (5,907)
Fair value 398,542 294,426
Single Issuers [Member]    
Held-to-maturity [Abstract]    
Amortized cost 9,219 9,168
Gross unrealized losses (2,067) (1,890)
Fair value 7,152 7,278
Pooled [Member]    
Held-to-maturity [Abstract]    
Amortized cost 75,168 75,264
Gross unrealized gains 682 849
Fair value $ 75,850 $ 76,113