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Securities - Securities with gross unrealized losses (Details) $ in Thousands | Dec. 31, 2021 USD ($) item | Dec. 31, 2020 USD ($)
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Investment Securities |  |
Number of securities with gross unrealized loss | item | 296 |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | $ 31,633 | $ 1,123
Twelve Months or More | 10,522 |
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 1,316,106 | 240,591
Twelve Months or More | 307,277 |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 46,537 | 3,144
Twelve Months or More | 17,261 | 1,021
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 2,935,314 | 542,297
Twelve Months or More | 462,192 | 105,125
U.S. Government agencies |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 1,745 |
Twelve Months or More | 882 |
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 86,168 |
Twelve Months or More | 24,118 |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 529 | 642
Twelve Months or More | 1,236 |
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 73,353 | 24,358
Twelve Months or More | 23,763 |
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 18,768 | 1,032
Twelve Months or More | 5,510 |
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 868,327 | 213,146
Twelve Months or More | 184,819 |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 17,381 | 1,031
Twelve Months or More | 8,604 |
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 1,274,934 | 260,411
Twelve Months or More | 221,435 |
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 4,937 |
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 169,240 |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 10,911 | 825
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 432,300 | 140,333
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 4,902 | 91
Twelve Months or More | 3,119 |
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 154,963 | 27,445
Twelve Months or More | 75,450 |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 13,120 | 46
Twelve Months or More | 5,310 | 4
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 846,581 | 13,594
Twelve Months or More | 98,106 | 871
State and municipal obligations |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 1,867 | 27
Twelve Months or More | 352 |
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 123,987 | 8,620
Twelve Months or More | 8,579 |
Small Business Administration loan-backed securities |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 1,281 |
Twelve Months or More | 1,011 |
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 37,408 |
Twelve Months or More | 22,890 |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 2,720 | 573
Twelve Months or More | 1,759 | 1,017
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 179,168 | 94,981
Twelve Months or More | 110,309 | $ 104,254
Corporate securities. |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 9 |
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | $ 4,991 |

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