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Securities (Tables) | 12 Months Ended
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Dec. 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | December 31, 2019 |  |  | December 31, 2018 |
|  |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |  |  |  |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |  |
|  | 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 |  | $ |  | 98,320 |  |  | $ |  | 652 |  |  | $ |  | 300 |  |  | $ |  | 98,672 |  |  | $ |  | 74,339 |  |  | $ |  | — |  |  | $ |  | 2,633 |  |  | $ |  | 71,706 |
Municipal obligations |  |  |  | 242,016 |  |  |  |  | 7,789 |  |  |  |  | — |  |  |  |  | 249,805 |  |  |  |  | 246,713 |  |  |  |  | 360 |  |  |  |  | 6,646 |  |  |  |  | 240,427 |
Residential mortgage-backed securities |  |  |  | 1,910,909 |  |  |  |  | 20,268 |  |  |  |  | 7,020 |  |  |  |  | 1,924,157 |  |  |  |  | 1,468,912 |  |  |  |  | 4,284 |  |  |  |  | 29,794 |  |  |  |  | 1,443,402 |
Commercial mortgage-backed securities |  |  |  | 1,570,765 |  |  |  |  | 19,880 |  |  |  |  | 4,178 |  |  |  |  | 1,586,467 |  |  |  |  | 799,060 |  |  |  |  | 1,953 |  |  |  |  | 30,936 |  |  |  |  | 770,077 |
Collateralized mortgage obligations |  |  |  | 807,600 |  |  |  |  | 3,757 |  |  |  |  | 3,142 |  |  |  |  | 808,215 |  |  |  |  | 163,282 |  |  |  |  | 903 |  |  |  |  | 2,260 |  |  |  |  | 161,925 |
Corporate debt securities |  |  |  | 8,000 |  |  |  |  | 21 |  |  |  |  | 33 |  |  |  |  | 7,988 |  |  |  |  | 3,500 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 3,500 |
|  | $ |  | 4,637,610 |  |  | $ |  | 52,367 |  |  | $ |  | 14,673 |  |  | $ |  | 4,675,304 |  |  | $ |  | 2,755,806 |  |  | $ |  | 7,500 |  |  | $ |  | 72,269 |  |  | $ |  | 2,691,037 |
Amortized Cost and Fair Value of Securities Held to Maturity |
Securities Held to Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | December 31, 2019 |  |  | December 31, 2018 |
|  |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |  |  |  |  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |  |
|  | 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 |  |  | $ |  | 3 |  |  | $ |  | — |  |  | $ |  | 50,003 |  |  | $ |  | 50,000 |  |  | $ |  | — |  |  | $ |  | 478 |  |  | $ |  | 49,522 |
Municipal obligations |  |  |  | 641,019 |  |  |  |  | 27,146 |  |  |  |  | 69 |  |  |  |  | 668,096 |  |  |  |  | 688,201 |  |  |  |  | 2,347 |  |  |  |  | 9,503 |  |  |  |  | 681,045 |
Residential mortgage-backed securities |  |  |  | 29,687 |  |  |  |  | 883 |  |  |  |  | — |  |  |  |  | 30,570 |  |  |  |  | 640,393 |  |  |  |  | 1,461 |  |  |  |  | 6,117 |  |  |  |  | 635,737 |
Commercial mortgage-backed securities |  |  |  | 539,371 |  |  |  |  | 12,474 |  |  |  |  | 581 |  |  |  |  | 551,264 |  |  |  |  | 357,175 |  |  |  |  | 376 |  |  |  |  | 10,882 |  |  |  |  | 346,669 |
Collateralized mortgage obligations |  |  |  | 307,932 |  |  |  |  | 3,597 |  |  |  |  | 458 |  |  |  |  | 311,071 |  |  |  |  | 1,243,778 |  |  |  |  | 1,598 |  |  |  |  | 22,493 |  |  |  |  | 1,222,883 |
|  | $ |  | 1,568,009 |  |  | $ |  | 44,103 |  |  | $ |  | 1,108 |  |  | $ |  | 1,611,004 |  |  | $ |  | 2,979,547 |  |  | $ |  | 5,782 |  |  | $ |  | 49,473 |  |  | $ |  | 2,935,856 |
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 years ended December 31, 2019, 2018 and 2017:
|  | Years Ended December 31, |
(in thousands) |  | 2019 |  |  | 2018 |  |  | 2017 |
Proceeds |  | $ | 268,413 |  |  | $ | 455,162 |  |  | $ | 213,877 |
Gross gains |  |  | — |  |  |  | — |  |  |  | — |
Gross losses |  |  | — |  |  |  | 25,480 |  |  |  | — |
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 |
(in thousands) |  | Amortized Cost |  |  | Fair Value |
Debt Securities Available for Sale |  |  |  |  |  |  |  |  |  |
Due in one year or less |  | $ |  | 356 |  |  | $ |  | 363 |
Due after one year through five years |  |  |  | 151,871 |  |  |  |  | 154,646 |
Due after five years through ten years |  |  |  | 1,764,275 |  |  |  |  | 1,778,398 |
Due after ten years |  |  |  | 2,721,108 |  |  |  |  | 2,741,897 |
Total available for sale debt securities |  | $ |  | 4,637,610 |  |  | $ |  | 4,675,304 |
Securities with Unrealized Losses |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | 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 |  | $ |  | 28,235 |  |  | $ |  | 300 |  |  | $ |  | — |  |  | $ |  | — |  |  | $ |  | 28,235 |  |  | $ |  | 300 |
Municipal obligations |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |
Residential mortgage-backed securities |  |  |  | 420,066 |  |  |  |  | 5,042 |  |  |  |  | 399,787 |  |  |  |  | 1,978 |  |  |  |  | 819,853 |  |  |  |  | 7,020 |
Commercial mortgage-backed securities |  |  |  | 458,855 |  |  |  |  | 3,971 |  |  |  |  | 14,896 |  |  |  |  | 207 |  |  |  |  | 473,751 |  |  |  |  | 4,178 |
Collateralized mortgage obligations |  |  |  | 89,689 |  |  |  |  | 1,315 |  |  |  |  | 184,389 |  |  |  |  | 1,827 |  |  |  |  | 274,078 |  |  |  |  | 3,142 |
Corporate debt securities |  |  |  | 1,467 |  |  |  |  | 33 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 1,467 |  |  |  |  | 33 |
. |  | $ |  | 998,312 |  |  | $ |  | 10,661 |  |  | $ |  | 599,072 |  |  | $ |  | 4,012 |  |  | $ |  | 1,597,384 |  |  | $ |  | 14,673 |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | 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 |
(in thousands) |  | Amortized Cost |  |  | Fair Value |
Debt Securities Held to Maturity |  |  |  |  |  |  |  |  |  |
Due in one year or less |  | $ |  | 50,000 |  |  | $ |  | 50,003 |
Due after one year through five years |  |  |  | 140,009 |  |  |  |  | 141,929 |
Due after five years through ten years |  |  |  | 672,094 |  |  |  |  | 694,992 |
Due after ten years |  |  |  | 705,906 |  |  |  |  | 724,080 |
Total held to maturity debt securities |  | $ |  | 1,568,009 |  |  | $ |  | 1,611,004 |
Securities with Unrealized Losses |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | 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 |  |  |  | 4,735 |  |  |  |  | 38 |  |  |  |  | 3,143 |  |  |  |  | 31 |  |  |  |  | 7,878 |  |  |  |  | 69 |
Residential mortgage-backed securities |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |  |  |  |  | — |
Commercial mortgage-backed securities |  |  |  | 28,426 |  |  |  |  | 581 |  |  |  |  | — |  |  |  |  | — |  |  |  |  | 28,426 |  |  |  |  | 581 |
Collateralized mortgage obligations |  |  |  | — |  |  |  |  | — |  |  |  |  | 49,110 |  |  |  |  | 458 |  |  |  |  | 49,110 |  |  |  |  | 458 |
|  | $ |  | 33,161 |  |  | $ |  | 619 |  |  | $ |  | 52,253 |  |  | $ |  | 489 |  |  | $ |  | 85,414 |  |  | $ |  | 1,108 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | 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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