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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

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