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Investments - Investments by contractual maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Schedule of Available-for-sale Securities    
Within one year, amortized cost $ 0  
Within one year, estimated fair value 0  
After one year through five years, amortized cost 1,577  
After one year through five years, estimated fair value 1,705  
After five years through ten years, amortized cost 23,097  
After five years through ten years, estimated fair value 24,616  
After ten years, amortized cost 176,003  
After ten years, estimated fair value 178,933  
Total securities with single maturity date, amortized cost 200,677  
Total securities with single maturity date, estimated fair value 205,254  
Debt securities, amortized cost 524,829  
Equity securities 522,943 $ 470,746
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 43,550  
Investment securities not due at a single maturity date, estimated fair value 43,212  
Debt securities, amortized cost 43,550 14,740
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 205,987  
Investment securities not due at a single maturity date, estimated fair value 202,305  
Debt securities, amortized cost 205,987 198,125
Private label mortgage and asset backed securities    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 65,615  
Investment securities not due at a single maturity date, estimated fair value 63,923  
Debt securities, amortized cost 65,615 155,308
Corporate debt securities    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 9,000  
Investment securities not due at a single maturity date, estimated fair value 8,249  
Debt securities, amortized cost $ 9,000 $ 9,000