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Investment Securities Available-for-Sale - Expected maturities for residential mortgage backed securities (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized Cost | $ 750,653 | $ 839,192
Investment securities | 772,394 | 843,363
Investment securities. | 772,394 |
U. S. agency securities |  |
One year or less, amortized cost | 34,038 | 96,332
After one year through five years, amortized cost | 77,465 | 76,121
Five years through ten years, amortized cost | 4,720 | 7,775
Amortized Cost | 116,223 | 180,228
One year or less, estimated fair value | 34,219 | 96,226
After one year through five years, estimated fair value | 78,008 | 75,821
Five years through ten years, estimated fair value | 4,827 | 7,747
Investment securities | 117,054 | 179,794
Residential mortgage backed securities |  |
Amortized cost, without maturity date | 516,297 | 541,490
Amortized Cost | 516,297 | 541,490
Estimated fair value, without maturity date | 531,528 | 543,852
Investment securities | 531,528 | 543,852
Municipal bonds |  |
One year or less, amortized cost | 7,382 | 5,897
After one year through five years, amortized cost | 19,797 | 21,416
Five years through ten years, amortized cost | 51,195 | 42,589
After ten years, amortized cost | 8,000 | 2,000
Amortized Cost | 86,374 | 71,902
One year or less, estimated fair value | 7,437 | 5,969
After one year through five years, estimated fair value | 20,703 | 21,953
Five years through ten years, estimated fair value | 54,407 | 44,015
After ten years, estimated fair value | 8,160 | 1,994
Investment securities | 90,694 | 73,931
Corporate bonds |  |
One year or less, amortized cost | 10,929 | 502
After one year through five years, amortized cost | 15,407 | 8,528
After ten years, amortized cost | 5,225 | 1,500
Amortized Cost | 31,561 | 10,530
One year or less, estimated fair value | 11,312 | 508
After one year through five years, estimated fair value | 15,999 | 8,725
After ten years, estimated fair value | 5,734 | 1,500
Investment securities | 32,920 | 10,733
U.S. Treasury |  |
Amortized cost, without maturity date |  | 34,844
Amortized Cost |  | 34,844
Estimated fair value, without maturity date |  | 34,855
Investment securities |  | 34,855
Investment Securities |  |
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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