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Investment Securities Available-for-Sale - Gross unrealized losses and fair value (Details) $ in Thousands | Sep. 30, 2020 USD ($) security | Dec. 31, 2019 USD ($) security
--- | --- | ---
Debt securities as percentage of total investment securities | 99.90% |
Number of securities | security | 63 | 148
Less than 12 months, estimated fair value | $ 177,650 | $ 274,947
Less than 12 months, unrealized losses | 766 | 1,592
12 months or greater, estimated fair value | 50,941 | 142,223
12 months or greater, unrealized losses | 674 | 1,443
Estimated fair value | 228,591 | 417,170
Unrealized losses | $ 1,440 | $ 3,035
U. S. agency securities |  |
Number of securities | security | 25 | 36
Less than 12 months, estimated fair value | $ 20,762 | $ 75,159
Less than 12 months, unrealized losses | 32 | 439
12 months or greater, estimated fair value | 43,607 | 51,481
12 months or greater, unrealized losses | 633 | 616
Estimated fair value | 64,369 | 126,640
Unrealized losses | $ 665 | $ 1,055
Residential mortgage backed securities |  |
Number of securities | security | 33 | 111
Less than 12 months, estimated fair value | $ 139,848 | $ 197,794
Less than 12 months, unrealized losses | 549 | 1,148
12 months or greater, estimated fair value | 7,334 | 90,742
12 months or greater, unrealized losses | 41 | 827
Estimated fair value | 147,182 | 288,536
Unrealized losses | $ 590 | $ 1,975
Municipal Bonds |  |
Number of securities | security | 4 | 1
Less than 12 months, estimated fair value | $ 14,086 | $ 1,994
Less than 12 months, unrealized losses | 114 | 5
12 months or greater, estimated fair value | 0 | 0
12 months or greater, unrealized losses | 0 | 0
Estimated fair value | 14,086 | 1,994
Unrealized losses | $ 114 | $ 5
Corporate bonds |  |
Number of securities | security | 1 |
Less than 12 months, estimated fair value | $ 2,954 |
Less than 12 months, unrealized losses | 71 |
12 months or greater, estimated fair value | 0 |
12 months or greater, unrealized losses | 0 |
Estimated fair value | 2,954 |
Unrealized losses | $ 71 |

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