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Short Duration Contracts - Claims development - Mortgage (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
claims
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Claims Development [Line Items]                  
Liabilities for losses and loss adjustment expenses, net of reinsurance $ 11,923,393,000                
Mortgage                  
Claims Development [Line Items]                  
Incurred losses and allocated loss adjustment expenses, net of reinsurance 2,179,937,000                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,570,996,000                
All outstanding liabilities before 2012, net of reinsurance 14,504,000                
Liabilities for losses and loss adjustment expenses, net of reinsurance 623,445,000                
Large claim size threshold 250,000                
Mortgage | 2012                  
Claims Development [Line Items]                  
Incurred losses and allocated loss adjustment expenses, net of reinsurance 456,331,000 $ 456,286,000 $ 458,065,000 $ 459,467,000 $ 467,296,000 $ 469,238,000 $ 475,317,000 $ 480,592,000 $ 520,835,000
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 453,587,000 452,348,000 448,151,000 441,577,000 426,024,000 395,695,000 327,605,000 186,605,000 $ (106,065,000)
Total of IBNR liabilities plus expected development on reported claims $ 5,000                
Cumulative number of paid claims | claims 15,083                
Mortgage | 2013                  
Claims Development [Line Items]                  
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 391,062,000 390,987,000 393,149,000 395,693,000 405,809,000 411,793,000 419,668,000 469,311,000  
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 387,894,000 386,853,000 382,200,000 373,909,000 353,189,000 308,956,000 203,957,000 $ 41,447,000  
Total of IBNR liabilities plus expected development on reported claims $ 3,000                
Cumulative number of paid claims | claims 9,471                
Mortgage | 2014                  
Claims Development [Line Items]                  
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 262,682,000 261,091,000 265,992,000 266,027,000 279,434,000 297,151,000 316,095,000    
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 256,285,000 254,175,000 247,038,000 233,879,000 201,925,000 129,159,000 $ 20,099,000    
Total of IBNR liabilities plus expected development on reported claims $ 7,000                
Cumulative number of paid claims | claims 6,290                
Mortgage | 2015                  
Claims Development [Line Items]                  
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 190,913,000 189,235,000 194,677,000 198,001,000 197,238,000 222,790,000      
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 183,472,000 180,321,000 171,337,000 151,222,000 92,431,000 $ 16,159,000      
Total of IBNR liabilities plus expected development on reported claims $ 4,000                
Cumulative number of paid claims | claims 4,543                
Mortgage | 2016                  
Claims Development [Line Items]                  
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 142,392,000 140,608,000 148,715,000 170,532,000 183,556,000        
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 131,161,000 127,286,000 113,357,000 72,201,000 $ 11,462,000        
Total of IBNR liabilities plus expected development on reported claims $ 7,000                
Cumulative number of paid claims | claims 3,411                
Mortgage | 2017                  
Claims Development [Line Items]                  
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 108,181,000 107,255,000 132,220,000 179,376,000          
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 87,317,000 78,650,000 48,112,000 $ 8,622,000          
Total of IBNR liabilities plus expected development on reported claims $ 630,000                
Cumulative number of paid claims | claims 2,429                
Mortgage | 2018                  
Claims Development [Line Items]                  
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 89,120,000 96,357,000 132,318,000            
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 50,135,000 31,478,000 $ 3,966,000            
Total of IBNR liabilities plus expected development on reported claims $ 1,281,000                
Cumulative number of paid claims | claims 1,512                
Mortgage | 2019                  
Claims Development [Line Items]                  
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 119,253,000 108,424,000              
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 20,105,000 $ 2,899,000              
Total of IBNR liabilities plus expected development on reported claims $ 2,921,000                
Cumulative number of paid claims | claims 566                
Mortgage | 2020                  
Claims Development [Line Items]                  
Incurred losses and allocated loss adjustment expenses, net of reinsurance $ 420,003,000                
Cumulative paid losses and allocated loss adjustment expenses, net of reinsurance 1,040,000                
Total of IBNR liabilities plus expected development on reported claims $ 15,879,000                
Cumulative number of paid claims | claims 32