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Investment Securities - Securities with gross unrealized losses (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | $ 25,123 | $ 3,144
Twelve Months or More | 835 | 1,021
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 1,360,682 | 542,297
Twelve Months or More | 115,928 | 105,125
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 20,929 | 1,123
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 1,091,175 | 240,591
U.S. Government agencies |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 1,163 | 642
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 48,137 | 24,358
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 937 |
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 49,051 |
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 13,457 | 1,031
Twelve Months or More | 65 |
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 743,915 | 260,411
Twelve Months or More | 3,887 |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 13,263 | 1,032
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 714,764 | 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 | 3,756 | 825
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 137,487 | 140,333
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 2,457 |
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 94,707 |
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 4,570 | 46
Twelve Months or More |  | 4
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 289,674 | 13,594
Twelve Months or More |  | 871
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 3,950 | 91
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 168,822 | 27,445
State and municipal obligations |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 1,383 | 27
Twelve Months or More | 4 |
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 74,127 | 8,620
Twelve Months or More | 3,938 |
Small Business Administration loan-backed securities |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 794 | 573
Twelve Months or More | 766 | 1,017
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 67,342 | 94,981
Twelve Months or More | 108,103 | $ 104,254
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 322 |
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | $ 63,831 |

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