Fair Value of Financial Instruments (Assets Measured At Fair Value On A Recurring And Nonrecurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets measured at fair value on a recurring basis [Abstract]
Fair value	$ 1,070,098	$ 1,493,639
Assets measured on a nonrecurring basis [Abstract]
Impaired loans	2,400
Fair Value, Measurements, Recurring [Member]
Assets measured at fair value on a recurring basis [Abstract]
U.S. Government agency securities	29,238	16,561
Federally insured student loan securities	115,149	126,012
Obligation of states and political subdivisions	194,859	612,648
Residential mortgage-backed securities	450,107	422,129
Commercial mortgage-backed securities	58,303	123,239
Commercial loan obligation securities	70,492
Foreign debt securities	57,132	66,878
Other debt securities	94,818	126,172
Fair value	1,070,098	1,493,639
Loans held for sale	489,938	217,080
Investment in unconsolidated entity, senior note	166,548	178,187
Investment in unconsolidated entity, subordinated note	11,972	15,408
Interest rate swaps, asset	43
Interest rate swaps, liability		942
Total assets	1,738,599	1,903,372
Fair Value, Measurements, Nonrecurring [Member]
Assets measured on a nonrecurring basis [Abstract]
Impaired loans	2,428	2,450
Intangible assets	4,929	6,228
Assets nonrecurring	7,357	8,678
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Assets measured at fair value on a recurring basis [Abstract]
Fair value		66,287
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
Assets measured at fair value on a recurring basis [Abstract]
Obligation of states and political subdivisions		1,182
Foreign debt securities		14,098
Other debt securities		51,007
Fair value		66,287
Total assets		66,287
Significant Other Observable Inputs (Level 2) [Member]
Assets measured at fair value on a recurring basis [Abstract]
Fair value	1,070,098	1,425,986
Interest rate swaps, asset	43
Interest rate swaps, liability		942
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
Assets measured at fair value on a recurring basis [Abstract]
U.S. Government agency securities	29,238	16,561
Federally insured student loan securities	115,149	126,012
Obligation of states and political subdivisions	194,859	611,466
Residential mortgage-backed securities	450,107	422,129
Commercial mortgage-backed securities	58,303	123,239
Commercial loan obligation securities	70,492
Foreign debt securities	57,132	52,235
Other debt securities	94,818	74,344
Fair value	1,070,098	1,425,986
Interest rate swaps, asset	43
Interest rate swaps, liability		942
Total assets	1,070,141	1,425,044
Significant Unobservable Inputs (Level 3) [Member]
Assets measured at fair value on a recurring basis [Abstract]
Fair value		1,366
Loans held for sale	489,938	217,080
Investment in unconsolidated entity, senior note	166,548	178,187
Investment in unconsolidated entity, subordinated note	11,972	15,408
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
Assets measured at fair value on a recurring basis [Abstract]
Foreign debt securities		545
Other debt securities		821
Fair value		1,366
Loans held for sale	489,938	217,080
Investment in unconsolidated entity, senior note	166,548	178,187
Investment in unconsolidated entity, subordinated note	11,972	15,408
Total assets	668,458	412,041
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Nonrecurring [Member]
Assets measured on a nonrecurring basis [Abstract]
Impaired loans	2,428	2,450
Intangible assets	4,929	6,228
Assets nonrecurring	$ 7,357	$ 8,678