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Fair Value Measurement (Schedule Of Reconciliation Of Assets And Liabilities Measured At Fair Value Using Significant Unobservable Inputs (Level 3) On A Recurring Basis) (Details) - Level 3 - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Junior Subordinated Debentures    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Junior subordinated debentures, beginning balance $ 262,209 $ 255,457
Junior subordinated debentures, change included in earnings 4,680 4,294
Junior subordinated debentures, purchases and issuances 0 0
Junior subordinated debentures, sales and settlements (3,284) (2,834)
Junior subordinated debentures, ending balance 263,605 256,917
Junior subordinated debentures, net change in unrealized gains or (losses) relating to items held at end of period 4,680 4,294
Interest Rate Lock Commitments    
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Interest rate lock commitment, beginning balance 4,076 3,631
Interest rate lock commitment, change included in earnings 797 2,044
Interest rate lock commitment, purchases and issuances 10,649 14,963
Interest rate lock commitment, sales and settlements (9,228) (12,383)
Interest rate lock commitment, ending balance 6,294 8,255
Interest rate lock commitment, net change in unrealized gains or (losses) relating to items held at end of period 6,294 8,255
Mortgage Servicing Rights    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Mortgage servicing rights, beginning balance 142,973 131,817
Mortgage servicing rights, change included in earnings (7,670) (20,625)
Mortgage servicing rights, purchases and issuances 7,041 5,980
Mortgage servicing rights, sales and settlements 0 0
Mortgage servicing rights, ending balance 142,344 117,172
Mortgage servicing rights, net change in unrealized gains or (losses) relating to items held at end of period $ (3,955) $ (19,827)