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Securities - Securities with gross unrealized losses (Details) $ in Thousands | Dec. 31, 2023 USD ($) item | Dec. 31, 2022 USD ($)
--- | --- | ---
Investment Securities |  |
Number of securities with gross unrealized loss | item | 1,232 |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months |  | $ 115,297
Twelve Months or More | $ 402,704 | 317,776
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months |  | 952,682
Twelve Months or More | 2,084,737 | 1,297,486
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 536 | 197,789
Twelve Months or More | 777,980 | 695,584
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 66,584 | 2,082,068
Twelve Months or More | 4,618,627 | 3,073,871
U.S. Treasuries |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months |  | 6,778
Twelve Months or More | 830 |
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months |  | 265,638
Twelve Months or More | 73,890 |
U.S. Government agencies |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months |  | 5,514
Twelve Months or More | 24,607 | 24,273
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months |  | 78,833
Twelve Months or More | 172,660 | 88,642
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months |  | 8,193
Twelve Months or More | 21,383 | 18,691
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months |  | 138,807
Twelve Months or More | 224,706 | 80,281
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months |  | 65,181
Twelve Months or More | 227,312 | 189,912
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months |  | 513,086
Twelve Months or More | 1,210,790 | 823,467
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 122 | 42,767
Twelve Months or More | 263,970 | 255,285
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 9,358 | 459,773
Twelve Months or More | 1,539,208 | 1,238,580
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months |  | 30,284
Twelve Months or More | 68,139 | 39,380
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months |  | 277,868
Twelve Months or More | 376,745 | 127,128
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months |  | 21,450
Twelve Months or More | 99,313 | 85,842
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months |  | 274,082
Twelve Months or More | 527,422 | 326,963
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months |  | 14,318
Twelve Months or More | 71,327 | 51,986
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months |  | 82,895
Twelve Months or More | 282,728 | 213,387
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 91 | 17,156
Twelve Months or More | 194,380 | 181,688
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 7,959 | 206,228
Twelve Months or More | 955,059 | 767,002
State and municipal obligations |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 177 | 97,084
Twelve Months or More | 152,114 | 108,799
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 6,340 | 616,631
Twelve Months or More | 967,305 | 391,848
Small Business Administration loan-backed securities |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Twelve Months or More | 11,319 | 12,225
Securities Held to Maturity, Fair Value |  |
Twelve Months or More | 41,814 | 44,862
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 128 | 2,152
Twelve Months or More | 42,222 | 44,543
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 42,447 | 92,535
Twelve Months or More | 304,770 | 264,933
Corporate securities. |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 18 | 2,209
Twelve Months or More | 3,768 | 736
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 480 | 28,374
Twelve Months or More | $ 26,267 | $ 4,264

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