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Investment Securities Available-for-Sale - Expected maturities for residential mortgage backed securities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized Cost |  |
Amortized Cost | $ 1,129,057 | $ 838,994
Estimated Fair Value |  |
Allowance for credit losses | (167) | 0
Estimated Fair Value | 1,150,885 | 843,165
U. S. agency securities |  |
Amortized Cost |  |
One year or less, amortized cost | 53,916 | 96,332
After one year through five years, amortized cost | 110,083 | 76,121
Five years through ten years, amortized cost | 17,087 | 7,775
Amortized Cost | 181,087 | 180,228
Estimated Fair Value |  |
One year or less, estimated fair value | 53,906 | 96,226
After one year through five years, estimated fair value | 110,777 | 75,821
Five years through ten years, estimated fair value | 17,240 | 7,747
Estimated Fair Value | 181,921 | 179,794
Residential mortgage backed securities |  |
Amortized Cost |  |
Amortized cost, without maturity date | 811,328 | 541,490
Amortized Cost | 811,328 | 541,490
Estimated Fair Value |  |
Estimated fair value, without maturity date | 825,001 | 543,852
Estimated Fair Value | 825,001 | 543,852
Municipal bonds |  |
Amortized Cost |  |
One year or less, amortized cost | 4,329 | 5,897
After one year through five years, amortized cost | 26,622 | 21,416
Five years through ten years, amortized cost | 69,309 | 42,589
After ten years, amortized cost | 2,000 | 2,000
Amortized Cost | 102,259 | 71,902
Estimated Fair Value |  |
One year or less, estimated fair value | 4,348 | 5,969
After one year through five years, estimated fair value | 28,272 | 21,953
Five years through ten years, estimated fair value | 73,389 | 44,015
After ten years, estimated fair value | 2,121 | 1,994
Allowance for credit losses | (18) |
Estimated Fair Value | 108,113 | 73,931
Corporate bonds |  |
Amortized Cost |  |
One year or less, amortized cost | 5,218 | 502
After one year through five years, amortized cost | 22,189 | 8,528
Five years through ten years, amortized cost | 6,976 |
After ten years, amortized cost |  | 1,500
Amortized Cost | 34,383 | 10,530
Estimated Fair Value |  |
One year or less, estimated fair value | 5,220 | 508
After one year through five years, estimated fair value | 23,267 | 8,725
Five years through ten years, estimated fair value | 7,511 |
After ten years, estimated fair value |  | 1,500
Allowance for credit losses | (149) |
Estimated Fair Value | $ 35,850 | 10,733
U.S. Treasury |  |
Amortized Cost |  |
Amortized cost, without maturity date |  | 34,844
Amortized Cost |  | 34,844
Estimated Fair Value |  |
Estimated fair value, without maturity date |  | 34,855
Estimated Fair Value |  | $ 34,855

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