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Investment Securities - Securities with gross unrealized losses (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | $ 44,456 | $ 3,144
Twelve Months or More | 1,189 | 1,021
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 1,720,518 | 542,297
Twelve Months or More | 123,335 | 105,125
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 33,595 | 1,123
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 1,077,326 | 240,591
U.S. Government agencies |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 1,447 | 642
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 23,553 | 24,358
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 1,919 |
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 48,069 |
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 21,669 | 1,031
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 987,348 | 260,411
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 19,340 | 1,032
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 729,951 | 213,146
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 6,303 | 825
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 140,650 | 140,333
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 4,627 |
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 94,699 |
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 8,418 | 46
Twelve Months or More |  | 4
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 271,699 | 13,594
Twelve Months or More |  | 871
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 5,878 | 91
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 141,438 | 27,445
State and municipal obligations |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 4,361 | 27
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 153,477 | 8,620
Small Business Administration loan-backed securities |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 2,225 | 573
Twelve Months or More | 1,189 | 1,017
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 136,824 | 94,981
Twelve Months or More | 123,335 | $ 104,254
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 1,831 |
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 63,169 |
Corporate securities. |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 33 |
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | $ 6,967 |

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