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Fair Value of Financial Instruments - Reconciliation of All Assets and Liabilities Measured Using Level 3 Input (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Level 3        
Purchases, issuances and settlements        
Net interest income including cash received and paid $ 1,900 $ 2,000 $ 5,900 $ 6,100
Securitized mortgage borrowings        
Purchases, issuances and settlements        
Unrealized gains (losses) still held 2,592,866 2,734,962    
Changes in fair value of liabilities during the period        
Fair value in the beginning of the period (3,393,721) (3,767,519) (3,653,265) (4,017,603)
Total gains (losses) included in earnings:        
Total (losses) gains included in earnings (73,880) (153,673) (93,532) (329,520)
Purchases, issuances and settlements        
Settlements 171,359 169,361 450,555 595,292
Fair value at the end of the period (3,296,242) (3,751,831) (3,296,242) (3,751,831)
Securitized mortgage borrowings | Interest expense        
Total gains (losses) included in earnings:        
Total (losses) gains included in earnings (13,487) (30,810) (50,684) (108,010)
Securitized mortgage borrowings | Change in fair value        
Total gains (losses) included in earnings:        
Total (losses) gains included in earnings (60,393) (122,863) (42,848) (221,510)
Long-term debt        
Purchases, issuances and settlements        
Unrealized gains (losses) still held 15,262 (17,439)    
Changes in fair value of liabilities during the period        
Fair value in the beginning of the period (45,787) (44,536) (44,982) (47,207)
Total gains (losses) included in earnings:        
Total (losses) gains included in earnings (951) (25) (1,756) (3,288)
Purchases, issuances and settlements        
Settlements       5,934
Fair value at the end of the period (46,738) (44,561) (46,738) (44,561)
Long-term debt | Interest expense        
Total gains (losses) included in earnings:        
Total (losses) gains included in earnings (191) (129) (513) (631)
Long-term debt | Change in fair value        
Total gains (losses) included in earnings:        
Total (losses) gains included in earnings (785) 104 697 (2,657)
Long-term debt | Change in instrument specific credit risk        
Total gains (losses) included in earnings:        
Total (losses) gains included in earnings 25   (1,940)  
Contingent consideration        
Purchases, issuances and settlements        
Unrealized gains (losses) still held   (5,816)    
Changes in fair value of liabilities during the period        
Fair value in the beginning of the period   (14,926) (554) (31,072)
Total gains (losses) included in earnings:        
Total (losses) gains included in earnings   4,402   9,104
Purchases, issuances and settlements        
Settlements   4,708 554 16,152
Fair value at the end of the period   (5,816)   (5,816)
Contingent consideration | Change in fair value        
Total gains (losses) included in earnings:        
Total (losses) gains included in earnings   4,402   9,104
Securitized mortgage collateral        
Changes in fair value of assets during the period        
Fair value at the beginning of the period 3,401,037 3,776,184 3,662,008 4,021,891
Total gains (losses) included in earnings:        
Total gains (losses) included in earnings 66,824 128,363 63,729 259,168
Purchases, issuances and settlements        
Settlements (165,669) (146,407) (423,545) (522,919)
Fair value at the end of the period 3,302,192 3,758,140 3,302,192 3,758,140
Unrealized gains (losses) still held (403,516) (580,845)    
Securitized mortgage collateral | Interest income        
Total gains (losses) included in earnings:        
Total gains (losses) included in earnings 7,097 9,979 24,071 39,564
Securitized mortgage collateral | Change in fair value        
Total gains (losses) included in earnings:        
Total gains (losses) included in earnings 59,727 118,384 39,658 219,604
Mortgage servicing rights        
Changes in fair value of assets during the period        
Fair value at the beginning of the period 180,733 152,273 154,405 131,537
Total gains (losses) included in earnings:        
Total gains (losses) included in earnings (5,445) (11,177) 4,127 (20,038)
Purchases, issuances and settlements        
Purchases       5,618
Issuances (5,717) (17,854) 22,473 42,728
Settlements       (895)
Fair value at the end of the period 181,005 158,950 181,005 158,950
Unrealized gains (losses) still held 181,005 158,950    
Mortgage servicing rights | Change in fair value        
Total gains (losses) included in earnings:        
Total gains (losses) included in earnings (5,445) (11,177) 4,127 (20,038)
Interest rate lock commitments. net (IRLCs)        
Changes in fair value of assets during the period        
Fair value at the beginning of the period 4,538 9,546 4,357 11,169
Total gains (losses) included in earnings:        
Total gains (losses) included in earnings (720) 2,469 (539) 846
Purchases, issuances and settlements        
Fair value at the end of the period 3,818 12,015 3,818 12,015
Unrealized gains (losses) still held 3,818 12,015    
Interest rate lock commitments. net (IRLCs) | Change in fair value        
Total gains (losses) included in earnings:        
Total gains (losses) included in earnings $ (720) $ 2,469 $ (539) $ 846