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Securities (Tables) | 3 Months Ended
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Mar. 31, 2022
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items] |
Amortized Cost and Fair Value of Debt Securities Available for Sale |
|  | March 31, 2022 |  |  | December 31, 2021 |
|  |  |  |  | Gross |  |  | Gross |  |  |  |  |  |  |  |  | Gross |  |  | Gross |  |  |  |
Securities Available for Sale |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |  |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
(in thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |  |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
U.S. Treasury and government agency securities |  | $ | 10,037 |  |  | $ | — |  |  | $ | 406 |  |  | $ | 9,631 |  |  | $ | 420,857 |  |  | $ | 3,781 |  |  | $ | 5,340 |  |  | $ | 419,298 |
Municipal obligations |  |  | 214,611 |  |  |  | 1,542 |  |  |  | 519 |  |  |  | 215,634 |  |  |  | 304,536 |  |  |  | 13,184 |  |  |  | 3,562 |  |  |  | 314,158 |
Residential mortgage-backed securities |  |  | 2,949,998 |  |  |  | 4,535 |  |  |  | 193,111 |  |  |  | 2,761,422 |  |  |  | 3,056,763 |  |  |  | 29,158 |  |  |  | 50,123 |  |  |  | 3,035,798 |
Commercial mortgage-backed securities |  |  | 3,089,562 |  |  |  | 2,587 |  |  |  | 197,976 |  |  |  | 2,894,173 |  |  |  | 3,064,828 |  |  |  | 61,645 |  |  |  | 48,614 |  |  |  | 3,077,859 |
Collateralized mortgage obligations |  |  | 94,294 |  |  |  | — |  |  |  | 3,074 |  |  |  | 91,220 |  |  |  | 119,046 |  |  |  | 1,837 |  |  |  | — |  |  |  | 120,883 |
Corporate debt securities |  |  | 21,500 |  |  |  | 32 |  |  |  | 605 |  |  |  | 20,927 |  |  |  | 18,500 |  |  |  | 210 |  |  |  | 8 |  |  |  | 18,702 |
﻿ |  | $ | 6,380,002 |  |  | $ | 8,696 |  |  | $ | 395,691 |  |  | $ | 5,993,007 |  |  | $ | 6,984,530 |  |  | $ | 109,815 |  |  | $ | 107,647 |  |  | $ | 6,986,698 |
Amortized Cost and Fair Value of Debt Securities Held to Maturity |
|  | March 31, 2022 |  |  | December 31, 2021 |
|  |  |  |  | Gross |  |  | Gross |  |  |  |  |  |  |  |  | Gross |  |  | Gross |  |  |  |
Securities Held to Maturity |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |  |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
(in thousands) |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |  |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
U.S. Treasury and government agency securities |  | $ | 368,334 |  |  | $ | — |  |  | $ | 14,745 |  |  | $ | 353,589 |  |  | $ | 14,857 |  |  | $ | — |  |  | $ | 20 |  |  | $ | 14,837 |
Municipal obligations |  |  | 696,275 |  |  |  | 5,986 |  |  |  | 7,492 |  |  |  | 694,769 |  |  |  | 621,405 |  |  |  | 37,941 |  |  |  | 205 |  |  |  | 659,141 |
Residential mortgage-backed securities |  |  | 525,039 |  |  |  | 211 |  |  |  | 23,814 |  |  |  | 501,436 |  |  |  | 268,907 |  |  |  | 682 |  |  |  | 1,499 |  |  |  | 268,090 |
Commercial mortgage-backed securities |  |  | 836,060 |  |  |  | 1,775 |  |  |  | 19,998 |  |  |  | 817,837 |  |  |  | 603,156 |  |  |  | 28,679 |  |  |  | 669 |  |  |  | 631,166 |
Collateralized mortgage obligations |  |  | 62,380 |  |  |  | 47 |  |  |  | 1,009 |  |  |  | 61,418 |  |  |  | 57,426 |  |  |  | 822 |  |  |  | — |  |  |  | 58,248 |
﻿ |  | $ | 2,488,088 |  |  | $ | 8,019 |  |  | $ | 67,058 |  |  | $ | 2,429,049 |  |  | $ | 1,565,751 |  |  | $ | 68,124 |  |  | $ | 2,393 |  |  | $ | 1,631,482 |
Proceeds from Gross Gains on and Gross Losses on Sale of Securities | The following table presents the proceeds from, gross gains on, and gross losses on sales of securities during the three months ended March 31, 2022 and 2021. Net gains or losses are reflected in the Securities Transactions, Net line items on the Consolidated Statements of Income.
|  | Three Months Ended March 31, |
(in thousands) |  | 2022 |  |  | 2021 |
Proceeds |  | $ | 73,219 |  |  | $ | — |
Gross gains |  |  | — |  |  |  | — |
Gross losses |  |  | 87 |  |  |  | — |
Net loss |  | $ | (87 | ) |  | $ | — |
Available for Sale Securities [Member] |
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items] |
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity |
Debt Securities Available for Sale |  | Amortized |  |  | Fair |
(in thousands) |  | Cost |  |  | Value |
Due in one year or less |  | $ | 691 |  |  | $ | 694 |
Due after one year through five years |  |  | 687,364 |  |  |  | 681,925 |
Due after five years through ten years |  |  | 2,902,497 |  |  |  | 2,715,517 |
Due after ten years |  |  | 2,789,450 |  |  |  | 2,594,871 |
Total available for sale debt securities |  | $ | 6,380,002 |  |  | $ | 5,993,007 |
Securities with Unrealized Losses |
Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
March 31, 2022 |  | Losses < 12 months |  |  | Losses 12 months or > |  |  | Total |
(in thousands) |  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |  |  | Fair Value |  |  | Gross Unrealized Losses |
U.S. Treasury and government agency securities |  | $ | 9,631 |  |  | $ | 406 |  |  | $ | — |  |  | $ | — |  |  | $ | 9,631 |  |  | $ | 406 |
Municipal obligations |  |  | 63,349 |  |  |  | 519 |  |  |  | — |  |  |  | — |  |  |  | 63,349 |  |  |  | 519 |
Residential mortgage-backed securities |  |  | 1,359,065 |  |  |  | 65,035 |  |  |  | 1,195,222 |  |  |  | 128,076 |  |  |  | 2,554,287 |  |  |  | 193,111 |
Commercial mortgage-backed securities |  |  | 1,762,250 |  |  |  | 91,931 |  |  |  | 802,289 |  |  |  | 106,045 |  |  |  | 2,564,539 |  |  |  | 197,976 |
Collateralized mortgage obligations |  |  | 91,220 |  |  |  | 3,074 |  |  |  | — |  |  |  | — |  |  |  | 91,220 |  |  |  | 3,074 |
Corporate debt securities |  |  | 15,895 |  |  |  | 605 |  |  |  | — |  |  |  | — |  |  |  | 15,895 |  |  |  | 605 |
﻿ |  | $ | 3,301,410 |  |  | $ | 161,570 |  |  | $ | 1,997,511 |  |  | $ | 234,121 |  |  | $ | 5,298,921 |  |  | $ | 395,691 |
Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2021 |  | Losses < 12 months |  |  | Losses 12 months or > |  |  | Total |
|  |  |  |  | Gross |  |  |  |  |  | Gross |  |  |  |  |  | Gross |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
(in thousands) |  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
U.S. Treasury and government agency securities |  | $ | 198,318 |  |  |  | 2,305 |  |  | $ | 63,534 |  |  | $ | 3,035 |  |  | $ | 261,852 |  |  | $ | 5,340 |
Municipal obligations |  |  | 43,021 |  |  |  | 2,372 |  |  |  | 25,126 |  |  |  | 1,190 |  |  |  | 68,147 |  |  |  | 3,562 |
Residential mortgage-backed securities |  |  | 1,293,179 |  |  |  | 20,581 |  |  |  | 819,596 |  |  |  | 29,541 |  |  |  | 2,112,775 |  |  |  | 50,122 |
Commercial mortgage-backed securities |  |  | 786,206 |  |  |  | 14,819 |  |  |  | 665,687 |  |  |  | 33,796 |  |  |  | 1,451,893 |  |  |  | 48,615 |
Collateralized mortgage obligations |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Corporate debt securities |  |  | 6,992 |  |  |  | 8 |  |  |  | — |  |  |  | — |  |  |  | 6,992 |  |  |  | 8 |
﻿ |  | $ | 2,327,716 |  |  | $ | 40,085 |  |  | $ | 1,573,943 |  |  | $ | 67,562 |  |  | $ | 3,901,659 |  |  | $ | 107,647 |
At e
Held-to-maturity Securities [Member] |
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items] |
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity |
Debt Securities Held to Maturity |  | Amortized |  |  | Fair |
(in thousands) |  | Cost |  |  | Value |
Due in one year or less |  | $ | 11,225 |  |  | $ | 11,248 |
Due after one year through five years |  |  | 379,981 |  |  |  | 379,671 |
Due after five years through ten years |  |  | 891,327 |  |  |  | 873,478 |
Due after ten years |  |  | 1,205,555 |  |  |  | 1,164,652 |
Total held to maturity securities |  | $ | 2,488,088 |  |  | $ | 2,429,049 |
Securities with Unrealized Losses |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
March 31, 2022 |  | Losses < 12 months |  |  | Losses 12 months or > |  |  | Total |
﻿ |  |  |  |  | Gross |  |  |  |  |  | Gross |  |  |  |  |  | Gross |
﻿ |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
(in thousands) |  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
U.S. Treasury and government agency securities |  | $ | 282,780 |  |  | $ | 11,386 |  |  | $ | 70,808 |  |  | $ | 3,360 |  |  | $ | 353,588 |  |  | $ | 14,746 |
Municipal obligations |  |  | 124,523 |  |  |  | 3,410 |  |  |  | 42,807 |  |  |  | 4,082 |  |  |  | 167,330 |  |  |  | 7,492 |
Residential mortgage-backed securities |  |  | 482,145 |  |  |  | 22,993 |  |  |  | 6,727 |  |  |  | 820 |  |  |  | 488,872 |  |  |  | 23,813 |
Commercial mortgage-backed securities |  |  | 551,422 |  |  |  | 18,637 |  |  |  | 10,931 |  |  |  | 1,361 |  |  |  | 562,353 |  |  |  | 19,998 |
Collateralized mortgage obligations |  |  | 50,719 |  |  |  | 1,009 |  |  |  | — |  |  |  | — |  |  |  | 50,719 |  |  |  | 1,009 |
﻿ |  | $ | 1,491,589 |  |  | $ | 57,435 |  |  | $ | 131,273 |  |  | $ | 9,623 |  |  | $ | 1,622,862 |  |  | $ | 67,058 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2021 |  | Losses < 12 months |  |  | Losses 12 months or > |  |  | Total |
﻿ |  |  |  |  | Gross |  |  |  |  |  | Gross |  |  |  |  |  | Gross |
﻿ |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
(in thousands) |  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
U.S. Treasury and government agency securities |  | $ | 14,837 |  |  | $ | 20 |  |  | $ | — |  |  | $ | — |  |  | $ | 14,837 |  |  | $ | 20 |
Municipal obligations |  |  | 7,795 |  |  |  | 205 |  |  |  | — |  |  |  | — |  |  |  | 7,795 |  |  |  | 205 |
Residential mortgage-backed securities |  |  | 253,661 |  |  |  | 1,499 |  |  |  | — |  |  |  | — |  |  |  | 253,661 |  |  |  | 1,499 |
Commercial mortgage-backed securities |  |  | 56,366 |  |  |  | 205 |  |  |  | 11,837 |  |  |  | 464 |  |  |  | 68,203 |  |  |  | 669 |
Collateralized mortgage obligations |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
﻿ |  | $ | 332,659 |  |  | $ | 1,929 |  |  | $ | 11,837 |  |  | $ | 464 |  |  | $ | 344,496 |  |  | $ | 2,393 |

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