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Investment Securities (Schedule Of Investment Securities Classified As Available-for-sale And Held-to-maturity) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Available-for-sale [Abstract]    
Amortized cost $ 1,303,050 $ 1,299,758
Gross unrealized gains 2,427 4,185
Gross unrealized losses (31,060) (9,459)
Fair value 1,274,417 1,294,484
Held-to-maturity [Abstract]    
Amortized cost 84,433 86,380
Gross unrealized gains 1,085 1,481
Gross unrealized losses (1,767) (2,516)
Fair value 83,751 85,345
U.S. Government Agency Securities [Member]    
Available-for-sale [Abstract]    
Amortized cost 55,807 50,107
Gross unrealized gains   21
Gross unrealized losses (1,844) (226)
Fair value 53,963 49,902
Asset-backed Securities [Member]    
Available-for-sale [Abstract]    
Amortized cost 205,823 269,164
Gross unrealized gains 577 1,196
Gross unrealized losses (172) (275)
Fair value 206,228 270,085
Federally insured student loan securities [Member]    
Available-for-sale [Abstract]    
Amortized cost 74,989 90,140
Gross unrealized gains 325 271
Gross unrealized losses (171) (270)
Fair value 75,143 90,141
Collateralized Loan Obligation Securities [Member]    
Available-for-sale [Abstract]    
Amortized cost 125,044 170,825
Gross unrealized gains 231 880
Gross unrealized losses (1) (5)
Fair value 125,274 171,700
Asset Backed Securities Other [Member]    
Available-for-sale [Abstract]    
Amortized cost 5,790 8,199
Gross unrealized gains 21 45
Fair value 5,811 8,244
Tax-exempt Obligations Of States And Political Subdivisions [Member]    
Available-for-sale [Abstract]    
Amortized cost 8,145 9,893
Gross unrealized gains 19 131
Gross unrealized losses (78) (36)
Fair value 8,086 9,988
Taxable obligations of states and political subdivisions [Member]    
Available-for-sale [Abstract]    
Amortized cost 60,688 64,739
Gross unrealized gains 674 1,377
Gross unrealized losses (1,542) (255)
Fair value 59,820 65,861
Residential Mortgage-backed Securities [Member]    
Available-for-sale [Abstract]    
Amortized cost 392,722 452,723
Gross unrealized gains 587 727
Gross unrealized losses (12,820) (4,598)
Fair value 380,489 448,852
Collateralized Mortgage Obligation Securities [Member]    
Available-for-sale [Abstract]    
Amortized cost 274,481 248,663
Gross unrealized gains 109 148
Gross unrealized losses (8,141) (2,318)
Fair value 266,449 246,493
Commercial Mortgage-backed Securities [Member]    
Available-for-sale [Abstract]    
Amortized cost 305,384 204,469
Gross unrealized gains 461 585
Gross unrealized losses (6,463) (1,751)
Fair value 299,382 203,303
Single Issuers [Member]    
Held-to-maturity [Abstract]    
Amortized cost 9,155 11,031
Gross unrealized gains   105
Gross unrealized losses (1,767) (2,516)
Fair value 7,388 8,620
Pooled [Member]    
Held-to-maturity [Abstract]    
Amortized cost 75,278 75,349
Gross unrealized gains 1,085 1,376
Fair value $ 76,363 $ 76,725