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Securities (Tables) | 9 Months Ended
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Sep. 30, 2018
Gain (Loss) on Investments [Line Items] |
Amortized Cost and Fair Value of Securities Available for Sale |
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﻿Securities Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿(in thousands) |  | September 30, 2018 |  | December 31, 2017
﻿ |  |  |  | Gross |  | 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 |  | $ | 94,366 |  |  | — |  |  | 5,054 |  |  | 89,312 |  | $ | 99,535 |  | $ | — |  | $ | 2,263 |  | $ | 97,272
﻿Municipal obligations |  |  | 243,546 |  |  | 95 |  |  | 10,928 |  |  | 232,713 |  |  | 245,997 |  |  | 1,135 |  |  | 3,346 |  |  | 243,786
﻿Residential mortgage-backed securities |  |  | 1,793,698 |  |  | 1,969 |  |  | 64,392 |  |  | 1,731,275 |  |  | 1,729,989 |  |  | 5,611 |  |  | 20,387 |  |  | 1,715,213
﻿Commercial mortgage-backed securities |  |  | 770,245 |  |  | — |  |  | 47,363 |  |  | 722,882 |  |  | 704,518 |  |  | 480 |  |  | 17,863 |  |  | 687,135
﻿Collateralized mortgage obligations |  |  | 143,496 |  |  | — |  |  | 4,993 |  |  | 138,503 |  |  | 165,518 |  |  | 4 |  |  | 1,559 |  |  | 163,963
﻿Corporate debt securities |  |  | 3,500 |  |  | — |  |  | — |  |  | 3,500 |  |  | 3,500 |  |  | — |  |  | — |  |  | 3,500
﻿ |  | $ | 3,048,851 |  | $ | 2,064 |  | $ | 132,730 |  | $ | 2,918,185 |  | $ | 2,949,057 |  | $ | 7,230 |  | $ | 45,418 |  | $ | 2,910,869
﻿
Amortized Cost and Fair Value of Securities Held to Maturity |
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﻿Securities Held to Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿(in thousands) |  | September 30, 2018 |  | December 31, 2017
﻿ |  |  |  | Gross |  | 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 |  | $ | 50,000 |  |  | — |  |  | 708 |  |  | 49,292 |  | $ | 50,000 |  | $ | — |  | $ | 289 |  | $ | 49,711
﻿Municipal obligations |  |  | 699,470 |  |  | 355 |  |  | 17,809 |  |  | 682,016 |  |  | 723,094 |  |  | 8,323 |  |  | 4,245 |  |  | 727,172
﻿Residential mortgage-backed securities |  |  | 668,320 |  |  | — |  |  | 15,501 |  |  | 652,819 |  |  | 725,748 |  |  | 4,175 |  |  | 2,690 |  |  | 727,233
﻿Commercial mortgage-backed securities |  |  | 357,428 |  |  | — |  |  | 17,429 |  |  | 339,999 |  |  | 317,185 |  |  | 40 |  |  | 3,915 |  |  | 313,310
﻿Collateralized mortgage obligations |  |  | 1,294,044 |  |  | — |  |  | 42,715 |  |  | 1,251,329 |  |  | 1,161,484 |  |  | 572 |  |  | 17,472 |  |  | 1,144,584
﻿ |  | $ | 3,069,262 |  | $ | 355 |  | $ | 94,162 |  | $ | 2,975,455 |  | $ | 2,977,511 |  | $ | 13,110 |  | $ | 28,611 |  | $ | 2,962,010
﻿
Available for Sale Securities [Member] |
Gain (Loss) on Investments [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 |  | $ | 4,814 |  | $ | 4,820
Due after one year through five years |  |  | 54,339 |  |  | 54,077
Due after five years through ten years |  |  | 1,259,696 |  |  | 1,196,235
Due after ten years |  |  | 1,730,002 |  |  | 1,663,053
Total available for sale debt securities |  | $ | 3,048,851 |  | $ | 2,918,185
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Securities with Unrealized Losses |
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﻿Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿September 30, 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 |  | $ | 41,765 |  |  | 2,027 |  |  | 47,547 |  |  | 3,027 |  | $ | 89,312 |  | $ | 5,054
﻿Municipal obligations |  |  | 53,337 |  |  | 1,568 |  |  | 165,732 |  |  | 9,360 |  |  | 219,069 |  |  | 10,928
﻿Residential mortgage-backed securities |  |  | 652,504 |  |  | 11,892 |  |  | 1,029,004 |  |  | 52,500 |  |  | 1,681,508 |  |  | 64,392
﻿Commercial mortgage-backed securities |  |  | 247,504 |  |  | 8,368 |  |  | 475,379 |  |  | 38,995 |  |  | 722,883 |  |  | 47,363
﻿Collateralized mortgage obligations |  |  | 82,853 |  |  | 2,836 |  |  | 55,650 |  |  | 2,157 |  |  | 138,503 |  |  | 4,993
﻿ |  | $ | 1,077,963 |  | $ | 26,691 |  | $ | 1,773,312 |  | $ | 106,039 |  | $ | 2,851,275 |  | $ | 132,730
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﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿December 31, 2017 |  | 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 |  | $ | 45,616 |  | $ | 42 |  | $ | 51,157 |  | $ | 2,221 |  | $ | 96,773 |  | $ | 2,263
﻿Municipal obligations |  |  | 2,768 |  |  | 11 |  |  | 173,530 |  |  | 3,335 |  |  | 176,298 |  |  | 3,346
﻿Residential mortgage-backed securities |  |  | 461,835 |  |  | 4,195 |  |  | 898,099 |  |  | 16,192 |  |  | 1,359,934 |  |  | 20,387
﻿Commercial mortgage-backed securities |  |  | 203,618 |  |  | 995 |  |  | 411,046 |  |  | 16,868 |  |  | 614,664 |  |  | 17,863
﻿Collateralized mortgage obligations |  |  | 128,174 |  |  | 1,076 |  |  | 35,488 |  |  | 483 |  |  | 163,662 |  |  | 1,559
﻿ |  | $ | 842,011 |  | $ | 6,319 |  | $ | 1,569,320 |  | $ | 39,099 |  | $ | 2,411,331 |  | $ | 45,418
﻿
Held-to-maturity Securities [Member] |
Gain (Loss) on Investments [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 |  | $ | 24,832 |  | $ | 24,909
Due after one year through five years |  |  | 130,348 |  |  | 127,950
Due after five years through ten years |  |  | 1,452,690 |  |  | 1,407,279
Due after ten years |  |  | 1,461,392 |  |  | 1,415,317
Total held to maturity securities |  | $ | 3,069,262 |  | $ | 2,975,455
﻿
Securities with Unrealized Losses |
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﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿September 30, 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 |  | $ | — |  |  | — |  |  | 49,292 |  |  | 708 |  | $ | 49,292 |  | $ | 708
﻿Municipal obligations |  |  | 378,622 |  |  | 7,288 |  |  | 217,955 |  |  | 10,521 |  |  | 596,577 |  |  | 17,809
﻿Residential mortgage-backed securities |  |  | 454,003 |  |  | 6,996 |  |  | 198,816 |  |  | 8,505 |  |  | 652,819 |  |  | 15,501
﻿Commercial mortgage-backed securities |  |  | 270,664 |  |  | 11,146 |  |  | 69,335 |  |  | 6,283 |  |  | 339,999 |  |  | 17,429
﻿Collateralized mortgage obligations |  |  | 572,469 |  |  | 11,263 |  |  | 678,860 |  |  | 31,452 |  |  | 1,251,329 |  |  | 42,715
﻿ |  | $ | 1,675,758 |  | $ | 36,693 |  | $ | 1,214,258 |  | $ | 57,469 |  | $ | 2,890,016 |  | $ | 94,162
﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿December 31, 2017 |  | 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 |  | $ | — |  | $ | — |  | $ | 49,711 |  | $ | 289 |  | $ | 49,711 |  | $ | 289
﻿Municipal obligations |  |  | 14,603 |  |  | 19 |  |  | 230,960 |  |  | 4,226 |  |  | 245,563 |  |  | 4,245
﻿Residential mortgage-backed securities |  |  | 8,815 |  |  | 99 |  |  | 230,277 |  |  | 2,591 |  |  | 239,092 |  |  | 2,690
﻿Commercial mortgage-backed securities |  |  | 174,882 |  |  | 744 |  |  | 72,499 |  |  | 3,171 |  |  | 247,381 |  |  | 3,915
﻿Collateralized mortgage obligations |  |  | 570,289 |  |  | 5,653 |  |  | 472,536 |  |  | 11,819 |  |  | 1,042,825 |  |  | 17,472
﻿ |  | $ | 768,589 |  | $ | 6,515 |  | $ | 1,055,983 |  | $ | 22,096 |  | $ | 1,824,572 |  |  | 28,611
﻿

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