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Investment Securities - Securities with gross unrealized losses (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | $ 33,468 | $ 3,144
Twelve Months or More | 9,783 | 1,021
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 2,198,476 | 542,297
Twelve Months or More | 316,100 | 105,125
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 34,384 | 1,123
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 1,530,348 | 240,591
U.S. Government agencies |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 245 | 642
Twelve Months or More | 1,248 |
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 49,092 | 24,358
Twelve Months or More | 23,752 |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 2,162 |
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 85,750 |
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 14,125 | 1,031
Twelve Months or More | 3,229 |
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 1,000,634 | 260,411
Twelve Months or More | 92,550 |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 19,505 | 1,032
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 1,009,342 | 213,146
Agencies or sponsored enterprises |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 5,041 | 825
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 157,770 | 140,333
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 4,029 |
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 140,511 |
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 7,684 | 46
Twelve Months or More | 3,581 | 4
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 617,854 | 13,594
Twelve Months or More | 79,540 | 871
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 6,586 | 91
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 232,991 | 27,445
State and municipal obligations |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 3,956 | 27
Twelve Months or More | 77 |
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 238,688 | 8,620
Twelve Months or More | 4,025 |
Small Business Administration loan-backed securities |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 2,417 | 573
Twelve Months or More | 1,648 | 1,017
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 134,438 | 94,981
Twelve Months or More | 116,233 | $ 104,254
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 2,102 |
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | $ 61,754 |

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