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Investment Securities Available-for-Sale - Expected maturities for residential mortgage backed securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Amortized cost $ 838,831 $ 839,192
Investment securities 858,916 843,363
U. S. agency securities    
One year or less, amortized cost 61,706 96,332
After one year through five years, amortized cost 80,513 76,121
Five years through ten years, amortized cost 4,729 7,775
Amortized cost 146,948 180,228
One year or less, estimated fair value 62,055 96,226
After one year through five years, estimated fair value 81,106 75,821
Five years through ten years, estimated fair value 4,598 7,747
Investment securities 147,759 179,794
Residential mortgage backed securities    
Amortized cost, without maturity date 531,784 541,490
Amortized cost 531,784 541,490
Estimated fair value, without maturity date 547,388 543,852
Investment securities 547,388 543,852
Municipal bonds    
One year or less, amortized cost 6,400 5,897
After one year through five years, amortized cost 20,844 21,416
Five years through ten years, amortized cost 43,584 42,589
After ten years, amortized cost 2,000 2,000
Amortized cost 72,828 71,902
One year or less, estimated fair value 6,456 5,969
After one year through five years, estimated fair value 21,437 21,953
Five years through ten years, estimated fair value 45,656 44,015
After ten years, estimated fair value 2,039 1,994
Investment securities 75,588 73,931
Corporate bonds    
One year or less, amortized cost 10,972 502
After one year through five years, amortized cost 35,891 8,528
After ten years, amortized cost 5,224 1,500
Amortized cost 52,087 10,530
One year or less, estimated fair value 11,054 508
After one year through five years, estimated fair value 36,600 8,725
After ten years, estimated fair value 5,330 1,500
Investment securities 52,984 10,733
U.S. Treasury    
Amortized cost, without maturity date 34,986 34,844
Amortized cost 34,986 34,844
Estimated fair value, without maturity date 34,999 34,855
Investment securities 34,999 34,855
Other equity investments    
Amortized cost, without maturity date 198 198
Amortized cost 198 198
Estimated fair value, without maturity date 198 198
Investment securities $ 198 $ 198