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Investments - Investments by contractual maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Schedule of Available-for-sale Securities    
Within one year, amortized cost $ 301  
Within one year, estimated fair value 305  
After one year through five years, amortized cost 3,285  
After one year through five years, estimated fair value 3,612  
After five years through ten years, amortized cost 24,932  
After five years through ten years, estimated fair value 26,876  
After ten years, amortized cost 379,670  
After ten years, estimated fair value 382,690  
Total securities with single maturity date, amortized cost 408,188  
Total securities with single maturity date, estimated fair value 413,483  
Debt securities, amortized cost 761,249  
Equity securities 768,719 $ 710,092
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 644  
Investment securities not due at a single maturity date, estimated fair value 655  
Debt securities, amortized cost 644 651
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 212,364  
Investment securities not due at a single maturity date, estimated fair value 214,386  
Debt securities, amortized cost 212,364 214,203
Private label mortgage and asset backed securities    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 108,053  
Investment securities not due at a single maturity date, estimated fair value 107,920  
Debt securities, amortized cost 108,053 82,413
Corporate debt securities    
Schedule of Available-for-sale Securities    
Investment securities not due at a single maturity date, amortized cost 32,000  
Investment securities not due at a single maturity date, estimated fair value 32,275  
Debt securities, amortized cost $ 32,000 $ 30,000