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Investment Securities - Securities with gross unrealized losses (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019
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Securities Available for Sale, Gross Unrealized Losses |  |  |
Less Than Twelve Months | $ 2,303 | $ 3,186 | $ 775
Twelve Months or More | 604 | 1,353 | 11,116
Securities Available for Sale, Fair Value |  |  |
Less Than Twelve Months | 246,790 | 503,728 | 122,076
Twelve Months or More | 52,993 | 141,982 | 867,514
Government-sponsored entities debt |  |  |
Securities Available for Sale, Gross Unrealized Losses |  |  |
Less Than Twelve Months |  |  | 49
Twelve Months or More |  |  | 255
Securities Available for Sale, Fair Value |  |  |
Less Than Twelve Months |  |  | 11,687
Twelve Months or More |  |  | 30,490
State and municipal obligations |  |  |
Securities Available for Sale, Gross Unrealized Losses |  |  |
Less Than Twelve Months | 415 | 764 |
Twelve Months or More |  |  | 54
Securities Available for Sale, Fair Value |  |  |
Less Than Twelve Months | 15,646 | 42,070 |
Twelve Months or More |  |  | 10,310
Mortgage-backed securities |  |  |
Securities Available for Sale, Gross Unrealized Losses |  |  |
Less Than Twelve Months | 1,888 | 2,422 | 726
Twelve Months or More | 604 | 1,353 | 10,807
Securities Available for Sale, Fair Value |  |  |
Less Than Twelve Months | 231,144 | 461,658 | 110,389
Twelve Months or More | $ 52,993 | $ 141,982 | $ 826,714

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