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Fair Value Measurement (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Net gain (loss) recognized on equity securities sold during the period $ (38) $ 0   $ 81,815 $ 0
Unrealized gains (losses) arising during the period 8,450 (2,409)   32,254 (5,605)
Changes in unrealized gains and losses on junior subordinated debentures carried at fair value, net of taxes 6,277 (1,794)   23,978 (4,174)
Net increase (decrease) in fair value (1,900) $ (6,500)   5,800 $ (1,100)
Mortgage Servicing Rights, Held For Sale $ 36,200     $ 36,200  
Visa Inc.          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Number of shares sold     486,346    
Class B common stock of Visa Inc.          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Net gain (loss) recognized on equity securities sold during the period     $ 81,900