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Securities - Securities with gross unrealized losses (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | $ 14,601 | $ 115,297
Twelve Months or More | 394,460 | 317,776
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 103,696 | 952,682
Twelve Months or More | 2,123,916 | 1,297,486
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 20,661 | 197,789
Twelve Months or More | 796,047 | 695,584
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 427,481 | 2,082,068
Twelve Months or More | 4,656,179 | 3,073,871
U.S. Treasuries |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months |  | 6,778
Twelve Months or More | 4,939 |
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months |  | 265,638
Twelve Months or More | 268,096 |
U.S. Government agencies |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months |  | 5,514
Twelve Months or More | 28,175 | 24,273
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months |  | 78,833
Twelve Months or More | 169,089 | 88,642
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 1,065 | 8,193
Twelve Months or More | 24,677 | 18,691
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 53,935 | 138,807
Twelve Months or More | 166,324 | 80,281
Residential mortgage-backed securities issued 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 | 238,470 | 189,912
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months |  | 513,086
Twelve Months or More | 1,314,903 | 823,467
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 1,027 | 42,767
Twelve Months or More | 277,536 | 255,285
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 32,334 | 459,773
Twelve Months or More | 1,640,828 | 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 | 1,187 | 30,284
Twelve Months or More | 62,130 | 39,380
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 45,925 | 277,868
Twelve Months or More | 359,552 | 127,128
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 2,650 | 21,450
Twelve Months or More | 95,513 | 85,842
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 73,464 | 274,082
Twelve Months or More | 517,948 | 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 | 13,414 | 14,318
Twelve Months or More | 54,727 | 51,986
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 57,771 | 82,895
Twelve Months or More | 235,050 | 213,387
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 10,606 | 17,156
Twelve Months or More | 182,288 | 181,688
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 107,009 | 206,228
Twelve Months or More | 874,332 | 767,002
State and municipal obligations |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 4,250 | 97,084
Twelve Months or More | 167,606 | 108,799
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 74,784 | 616,631
Twelve Months or More | 888,984 | 391,848
Small Business Administration loan-backed securities |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Twelve Months or More | 10,958 | 12,225
Securities Held to Maturity, Fair Value |  |
Twelve Months or More | 45,322 | 44,862
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 428 | 2,152
Twelve Months or More | 40,736 | 44,543
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 80,092 | 92,535
Twelve Months or More | 278,346 | 264,933
Corporate securities. |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 635 | 2,209
Twelve Months or More | 2,752 | 736
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 5,863 | 28,374
Twelve Months or More | $ 21,321 | $ 4,264

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