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Investment securities and impairment of investment securities - Fair Value of and Gross Unrealized Losses on Investment Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Marketable securities    
Less than 12 months - Fair value $ 79,196 $ 34,960
Less than 12 months - Unrealized loss (287) (31)
12 months or more - Fair value 191,493 484,809
12 months or more - Unrealized loss (2,550) (12,915)
Total - Fair value 270,689 519,769
Total - Unrealized loss (2,837) (12,946)
U.S. government and agencies    
Marketable securities    
Less than 12 months - Fair value 0 0
Less than 12 months - Unrealized loss 0 0
12 months or more - Fair value 67,610 136,425
12 months or more - Unrealized loss (460) (2,449)
Total - Fair value 67,610 136,425
Total - Unrealized loss (460) (2,449)
Municipal securities    
Marketable securities    
Less than 12 months - Fair value 0 929
Less than 12 months - Unrealized loss 0 (1)
12 months or more - Fair value 0 1,709
12 months or more - Unrealized loss 0 (10)
Total - Fair value 0 2,638
Total - Unrealized loss 0 (11)
Residential mortgage-backed securities | Agency CMOs    
Marketable securities    
Less than 12 months - Fair value 79,196 34,031
Less than 12 months - Unrealized loss (287) (30)
12 months or more - Fair value 123,883 346,675
12 months or more - Unrealized loss (2,090) (10,456)
Total - Fair value 203,079 380,706
Total - Unrealized loss $ (2,377) $ (10,486)