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Securities (Tables) | 3 Months Ended
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Mar. 31, 2019
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 Securities Available for Sale |
Securities Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(in thousands) |  | March 31, 2019 |  |  | December 31, 2018 |
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |  |  |  |  |  | Gross |  |  |  |  |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |  |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |  |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
U.S. Treasury and government agency securities |  | $ | 73,426 |  |  |  | — |  |  |  | 1,283 |  |  | $ | 72,143 |  |  | $ | 74,339 |  |  | $ | — |  |  | $ | 2,633 |  |  | $ | 71,706 |
Municipal obligations |  |  | 245,707 |  |  |  | 1,833 |  |  |  | 1,600 |  |  |  | 245,940 |  |  |  | 246,713 |  |  |  | 360 |  |  |  | 6,646 |  |  |  | 240,427 |
Residential mortgage-backed securities |  |  | 1,418,881 |  |  |  | 9,964 |  |  |  | 15,813 |  |  |  | 1,413,032 |  |  |  | 1,468,912 |  |  |  | 4,284 |  |  |  | 29,794 |  |  |  | 1,443,402 |
Commercial mortgage-backed securities |  |  | 798,447 |  |  |  | 4,594 |  |  |  | 15,207 |  |  |  | 787,834 |  |  |  | 799,060 |  |  |  | 1,953 |  |  |  | 30,936 |  |  |  | 770,077 |
Collateralized mortgage obligations |  |  | 158,904 |  |  |  | 1,212 |  |  |  | 1,485 |  |  |  | 158,631 |  |  |  | 163,282 |  |  |  | 903 |  |  |  | 2,260 |  |  |  | 161,925 |
Corporate debt securities |  |  | 3,500 |  |  |  | — |  |  |  | — |  |  |  | 3,500 |  |  |  | 3,500 |  |  |  | — |  |  |  | — |  |  |  | 3,500 |
﻿ |  | $ | 2,698,865 |  |  | $ | 17,603 |  |  | $ | 35,388 |  |  | $ | 2,681,080 |  |  | $ | 2,755,806 |  |  | $ | 7,500 |  |  | $ | 72,269 |  |  | $ | 2,691,037 |
Amortized Cost and Fair Value of Securities Held to Maturity |
|  | March 31, 2019 |  |  | December 31, 2018 |
|  |  |  |  |  | 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 |  | $ | 50,000 |  |  |  | — |  |  |  | 317 |  |  | $ | 49,683 |  |  | $ | 50,000 |  |  | $ | — |  |  | $ | 478 |  |  | $ | 49,522 |
Municipal obligations |  |  | 676,651 |  |  |  | 11,247 |  |  |  | 1,726 |  |  |  | 686,172 |  |  |  | 688,201 |  |  |  | 2,347 |  |  |  | 9,503 |  |  |  | 681,045 |
Residential mortgage-backed securities |  |  | 613,964 |  |  |  | 3,701 |  |  |  | 3,148 |  |  |  | 614,517 |  |  |  | 640,393 |  |  |  | 1,461 |  |  |  | 6,117 |  |  |  | 635,737 |
Commercial mortgage-backed securities |  |  | 356,919 |  |  |  | 1,233 |  |  |  | 3,780 |  |  |  | 354,372 |  |  |  | 357,175 |  |  |  | 376 |  |  |  | 10,882 |  |  |  | 346,669 |
Collateralized mortgage obligations |  |  | 1,198,908 |  |  |  | 3,285 |  |  |  | 14,027 |  |  |  | 1,188,166 |  |  |  | 1,243,778 |  |  |  | 1,598 |  |  |  | 22,493 |  |  |  | 1,222,883 |
﻿ |  | $ | 2,896,442 |  |  | $ | 19,466 |  |  | $ | 22,998 |  |  | $ | 2,892,910 |  |  | $ | 2,979,547 |  |  | $ | 5,782 |  |  | $ | 49,473 |  |  | $ | 2,935,856 |
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 |  | $ | 368 |  |  | $ | 374 |
Due after one year through five years |  |  | 107,225 |  |  |  | 108,866 |
Due after five years through ten years |  |  | 1,184,905 |  |  |  | 1,175,070 |
Due after ten years |  |  | 1,406,367 |  |  |  | 1,396,770 |
Total available for sale debt securities |  | $ | 2,698,865 |  |  | $ | 2,681,080 |
Securities with Unrealized Losses |
Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
March 31, 2019 |  | 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 |  | $ | - |  |  |  | - |  |  |  | 72,143 |  |  |  | 1,283 |  |  | $ | 72,143 |  |  | $ | 1,283 |
Municipal obligations |  |  | 2,270 |  |  |  | 40 |  |  |  | 106,042 |  |  |  | 1,560 |  |  |  | 108,312 |  |  |  | 1,600 |
Residential mortgage-backed securities |  |  | 640 |  |  |  | 6 |  |  |  | 852,716 |  |  |  | 15,807 |  |  |  | 853,356 |  |  |  | 15,813 |
Commercial mortgage-backed securities |  |  | - |  |  |  | - |  |  |  | 583,978 |  |  |  | 15,207 |  |  |  | 583,978 |  |  |  | 15,207 |
Collateralized mortgage obligations |  |  | - |  |  |  | - |  |  |  | 108,798 |  |  |  | 1,485 |  |  |  | 108,798 |  |  |  | 1,485 |
﻿ |  | $ | 2,910 |  |  | $ | 46 |  |  | $ | 1,723,677 |  |  | $ | 35,342 |  |  | $ | 1,726,587 |  |  | $ | 35,388 |
Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2018 |  | 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 |  | $ | — |  |  |  | — |  |  | $ | 71,706 |  |  | $ | 2,633 |  |  | $ | 71,706 |  |  | $ | 2,633 |
Municipal obligations |  |  | 41,203 |  |  |  | 591 |  |  |  | 170,883 |  |  |  | 6,054 |  |  |  | 212,086 |  |  |  | 6,645 |
Residential mortgage-backed securities |  |  | 305,090 |  |  |  | 2,485 |  |  |  | 762,826 |  |  |  | 27,309 |  |  |  | 1,067,916 |  |  |  | 29,794 |
Commercial mortgage-backed securities |  |  | 96,226 |  |  |  | 1,851 |  |  |  | 570,485 |  |  |  | 29,085 |  |  |  | 666,711 |  |  |  | 30,936 |
Collateralized mortgage obligations |  |  | 254 |  |  |  | 1 |  |  |  | 111,804 |  |  |  | 2,259 |  |  |  | 112,058 |  |  |  | 2,260 |
﻿ |  | $ | 442,773 |  |  | $ | 4,928 |  |  | $ | 1,687,704 |  |  | $ | 67,340 |  |  | $ | 2,130,477 |  |  | $ | 72,268 |
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 |  | $ | 80,915 |  |  | $ | 80,716 |
Due after one year through five years |  |  | 67,617 |  |  |  | 67,418 |
Due after five years through ten years |  |  | 1,392,654 |  |  |  | 1,398,880 |
Due after ten years |  |  | 1,355,256 |  |  |  | 1,345,896 |
Total held to maturity securities |  | $ | 2,896,442 |  |  | $ | 2,892,910 |
Securities with Unrealized Losses |
Held to Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
March 31, 2019 |  | 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 |  | $ | — |  |  |  | — |  |  | $ | 49,682 |  |  | $ | 317 |  |  | $ | 49,682 |  |  | $ | 317 |
Municipal obligations |  |  | 8,750 |  |  |  | 63 |  |  |  | 169,931 |  |  |  | 1,663 |  |  |  | 178,681 |  |  |  | 1,726 |
Residential mortgage-backed securities |  |  | — |  |  |  | — |  |  |  | 186,221 |  |  |  | 3,148 |  |  |  | 186,221 |  |  |  | 3,148 |
Commercial mortgage-backed securities |  |  | — |  |  |  | — |  |  |  | 312,296 |  |  |  | 3,780 |  |  |  | 312,296 |  |  |  | 3,780 |
Collateralized mortgage obligations |  |  | — |  |  |  | — |  |  |  | 860,183 |  |  |  | 14,027 |  |  |  | 860,183 |  |  |  | 14,027 |
﻿ |  | $ | 8,750 |  |  | $ | 63 |  |  | $ | 1,578,313 |  |  | $ | 22,935 |  |  | $ | 1,587,063 |  |  | $ | 22,998 |
Held to Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
December 31, 2018 |  | 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 |  | $ | — |  |  | $ | — |  |  | $ | 49,521 |  |  | $ | 478 |  |  | $ | 49,521 |  |  | $ | 478 |
Municipal obligations |  |  | 233,469 |  |  |  | 2,256 |  |  |  | 233,280 |  |  |  | 7,247 |  |  |  | 466,749 |  |  |  | 9,503 |
Residential mortgage-backed securities |  |  | 90,730 |  |  |  | 123 |  |  |  | 235,251 |  |  |  | 5,994 |  |  |  | 325,981 |  |  |  | 6,117 |
Commercial mortgage-backed securities |  |  | — |  |  |  | — |  |  |  | 305,419 |  |  |  | 10,882 |  |  |  | 305,419 |  |  |  | 10,882 |
Collateralized mortgage obligations |  |  | 77,394 |  |  |  | 281 |  |  |  | 897,153 |  |  |  | 22,212 |  |  |  | 974,547 |  |  |  | 22,493 |
﻿ |  | $ | 401,593 |  |  | $ | 2,660 |  |  | $ | 1,720,624 |  |  | $ | 46,813 |  |  | $ | 2,122,217 |  |  | $ | 49,473 |

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