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Securities (Tables) | 9 Months Ended
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Sep. 30, 2021
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 |
|  | September 30, 2021 |  |  | December 31, 2020 |
|  |  |  |  |  | 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 |  | $ | 394,069 |  |  | $ | 4,822 |  |  | $ | 4,169 |  |  | $ | 394,722 |  |  | $ | 207,365 |  |  | $ | 6,289 |  |  | $ | 284 |  |  | $ | 213,370 |
Municipal obligations |  |  | 305,701 |  |  |  | 13,504 |  |  |  | 3,178 |  |  |  | 316,027 |  |  |  | 309,342 |  |  |  | 17,536 |  |  |  | 153 |  |  |  | 326,725 |
Residential mortgage-backed securities |  |  | 3,256,700 |  |  |  | 39,681 |  |  |  | 42,988 |  |  |  | 3,253,393 |  |  |  | 2,560,249 |  |  |  | 69,570 |  |  |  | 8 |  |  |  | 2,629,811 |
Commercial mortgage-backed securities |  |  | 2,838,584 |  |  |  | 81,615 |  |  |  | 35,766 |  |  |  | 2,884,433 |  |  |  | 2,323,306 |  |  |  | 135,516 |  |  |  | 3,288 |  |  |  | 2,455,534 |
Collateralized mortgage obligations |  |  | 133,957 |  |  |  | 3,628 |  |  |  | — |  |  |  | 137,585 |  |  |  | 354,472 |  |  |  | 7,651 |  |  |  | — |  |  |  | 362,123 |
Corporate debt securities |  |  | 14,500 |  |  |  | 263 |  |  |  | 2 |  |  |  | 14,761 |  |  |  | 11,500 |  |  |  | 264 |  |  |  | — |  |  |  | 11,764 |
﻿ |  | $ | 6,943,511 |  |  | $ | 143,513 |  |  | $ | 86,103 |  |  | $ | 7,000,921 |  |  | $ | 5,766,234 |  |  | $ | 236,826 |  |  | $ | 3,733 |  |  | $ | 5,999,327 |
Amortized Cost and Fair Value of Debt Securities Held to Maturity |
|  | September 30, 2021 |  |  | December 31, 2020 |
|  |  |  |  |  | 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 |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Municipal obligations |  |  | 617,289 |  |  |  | 39,989 |  |  |  | 211 |  |  |  | 657,067 |  |  |  | 627,019 |  |  |  | 51,408 |  |  |  | 2 |  |  |  | 678,425 |
Residential mortgage-backed securities |  |  | 47,330 |  |  |  | 985 |  |  |  | 243 |  |  |  | 48,072 |  |  |  | 21,951 |  |  |  | 1,469 |  |  |  | — |  |  |  | 23,420 |
Commercial mortgage-backed securities |  |  | 573,854 |  |  |  | 36,614 |  |  |  | 350 |  |  |  | 610,118 |  |  |  | 549,686 |  |  |  | 54,587 |  |  |  | — |  |  |  | 604,273 |
Collateralized mortgage obligations |  |  | 69,228 |  |  |  | 1,482 |  |  |  | — |  |  |  | 70,710 |  |  |  | 158,514 |  |  |  | 2,949 |  |  |  | — |  |  |  | 161,463 |
﻿ |  | $ | 1,307,701 |  |  | $ | 79,070 |  |  | $ | 804 |  |  | $ | 1,385,967 |  |  | $ | 1,357,170 |  |  | $ | 110,413 |  |  | $ | 2 |  |  | $ | 1,467,581 |
Proceeds from Gross Gains on and Gross Losses on Sale of Securities | The following table presents the proceeds from, gross gain on, and gross losses on sales of securities during the nine months ended September 30, 2021 and 2020.
|  | Nine Months Ended September 30, |
(in thousands) |  | 2021 |  |  | 2020 |
Proceeds |  | $ | 198,681 |  |  | $ | 211,919 |
Gross gains |  |  | 1,649 |  |  |  | 1,984 |
Gross losses |  |  | 1,316 |  |  |  | 1,496 |
Net gain |  | $ | 333 |  |  | $ | 488 |
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 |  | $ | 2,290 |  |  | $ | 2,294 |
Due after one year through five years |  |  | 636,212 |  |  |  | 670,865 |
Due after five years through ten years |  |  | 2,805,443 |  |  |  | 2,839,375 |
Due after ten years |  |  | 3,499,566 |  |  |  | 3,488,387 |
Total available for sale debt securities |  | $ | 6,943,511 |  |  | $ | 7,000,921 |
Securities with Unrealized Losses |
Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
September 30, 2021 |  | 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 |  | $ | 199,451 |  |  | $ | 2,712 |  |  | $ | 32,489 |  |  | $ | 1,457 |  |  | $ | 231,940 |  |  | $ | 4,169 |
Municipal obligations |  |  | 43,297 |  |  |  | 2,098 |  |  |  | 25,243 |  |  |  | 1,080 |  |  |  | 68,540 |  |  |  | 3,178 |
Residential mortgage-backed securities |  |  | 2,097,625 |  |  |  | 42,984 |  |  |  | 704 |  |  |  | 4 |  |  |  | 2,098,329 |  |  |  | 42,988 |
Commercial mortgage-backed securities |  |  | 856,462 |  |  |  | 22,196 |  |  |  | 294,972 |  |  |  | 13,570 |  |  |  | 1,151,434 |  |  |  | 35,766 |
Collateralized mortgage obligations |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Corporate debt securities |  |  | 2,998 |  |  |  | 2 |  |  |  | — |  |  |  | — |  |  |  | 2,998 |  |  |  | 2 |
﻿ |  | $ | 3,199,833 |  |  | $ | 69,992 |  |  | $ | 353,408 |  |  | $ | 16,111 |  |  | $ | 3,553,241 |  |  | $ | 86,103 |
Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2020 |  | 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 |  | $ | 35,845 |  |  |  | 284 |  |  | $ | — |  |  | $ | — |  |  | $ | 35,845 |  |  | $ | 284 |
Municipal obligations |  |  | 30,170 |  |  |  | 153 |  |  |  | — |  |  |  | — |  |  |  | 30,170 |  |  |  | 153 |
Residential mortgage-backed securities |  |  | 530 |  |  |  | 2 |  |  |  | 760 |  |  |  | 6 |  |  |  | 1,290 |  |  |  | 8 |
Commercial mortgage-backed securities |  |  | 446,190 |  |  |  | 3,288 |  |  |  | — |  |  |  | — |  |  |  | 446,190 |  |  |  | 3,288 |
Collateralized mortgage obligations |  |  | 70 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 70 |  |  |  | — |
Corporate debt securities |  |  | 2,000 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2,000 |  |  |  | — |
﻿ |  | $ | 514,805 |  |  | $ | 3,727 |  |  | $ | 760 |  |  | $ | 6 |  |  | $ | 515,565 |  |  | $ | 3,733 |
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 |  | $ | 11,226 |  |  | $ | 11,371 |
Due after one year through five years |  |  | 336,328 |  |  |  | 354,897 |
Due after five years through ten years |  |  | 548,812 |  |  |  | 587,548 |
Due after ten years |  |  | 411,335 |  |  |  | 432,151 |
Total held to maturity securities |  | $ | 1,307,701 |  |  | $ | 1,385,967 |
Securities with Unrealized Losses |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
September 30, 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 |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Municipal obligations |  |  | 7,789 |  |  |  | 211 |  |  |  | 190 |  |  |  | — |  |  |  | 7,979 |  |  |  | 211 |
Residential mortgage-backed securities |  |  | 7,821 |  |  |  | 243 |  |  |  | — |  |  |  | — |  |  |  | 7,821 |  |  |  | 243 |
Commercial mortgage-backed securities |  |  | 11,960 |  |  |  | 350 |  |  |  | — |  |  |  | — |  |  |  | 11,960 |  |  |  | 350 |
Collateralized mortgage obligations |  |  | 291 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 291 |  |  |  | — |
﻿ |  | $ | 27,861 |  |  | $ | 804 |  |  | $ | 190 |  |  | $ | — |  |  | $ | 28,051 |  |  | $ | 804 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2020 |  | 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 |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Municipal obligations |  |  | — |  |  |  | — |  |  |  | 2,381 |  |  |  | 2 |  |  |  | 2,381 |  |  |  | 2 |
Residential mortgage-backed securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Commercial mortgage-backed securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Collateralized mortgage obligations |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
﻿ |  | $ | — |  |  | $ | — |  |  | $ | 2,381 |  |  | $ | 2 |  |  | $ | 2,381 |  |  | $ | 2 |

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