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Securities (Tables) | 6 Months Ended
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Jun. 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) |  | June 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 |  | $ | 95,469 |  |  | — |  |  | 4,484 |  |  | 90,985 |  | $ | 99,535 |  | $ | — |  | $ | 2,263 |  | $ | 97,272
﻿Municipal obligations |  |  | 244,365 |  |  | 165 |  |  | 8,520 |  |  | 236,010 |  |  | 245,997 |  |  | 1,135 |  |  | 3,346 |  |  | 243,786
﻿Residential mortgage-backed securities |  |  | 1,826,589 |  |  | 2,609 |  |  | 54,327 |  |  | 1,774,871 |  |  | 1,729,989 |  |  | 5,611 |  |  | 20,387 |  |  | 1,715,213
﻿Commercial mortgage-backed securities |  |  | 770,769 |  |  | 153 |  |  | 41,390 |  |  | 729,532 |  |  | 704,518 |  |  | 480 |  |  | 17,863 |  |  | 687,135
﻿Collateralized mortgage obligations |  |  | 150,928 |  |  | — |  |  | 4,153 |  |  | 146,775 |  |  | 165,518 |  |  | 4 |  |  | 1,559 |  |  | 163,963
﻿Corporate debt securities |  |  | 3,500 |  |  | — |  |  | — |  |  | 3,500 |  |  | 3,500 |  |  | — |  |  | — |  |  | 3,500
﻿ |  | $ | 3,091,620 |  | $ | 2,927 |  | $ | 112,874 |  | $ | 2,981,673 |  | $ | 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) |  | June 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 |  |  | — |  |  | 668 |  |  | 49,332 |  | $ | 50,000 |  | $ | — |  | $ | 289 |  | $ | 49,711
﻿Municipal obligations |  |  | 704,082 |  |  | 953 |  |  | 14,166 |  |  | 690,869 |  |  | 723,094 |  |  | 8,323 |  |  | 4,245 |  |  | 727,172
﻿Residential mortgage-backed securities |  |  | 665,846 |  |  | 194 |  |  | 14,730 |  |  | 651,310 |  |  | 725,748 |  |  | 4,175 |  |  | 2,690 |  |  | 727,233
﻿Commercial mortgage-backed securities |  |  | 357,680 |  |  | 153 |  |  | 14,581 |  |  | 343,252 |  |  | 317,185 |  |  | 40 |  |  | 3,915 |  |  | 313,310
﻿Collateralized mortgage obligations |  |  | 1,354,592 |  |  | 18 |  |  | 34,904 |  |  | 1,319,706 |  |  | 1,161,484 |  |  | 572 |  |  | 17,472 |  |  | 1,144,584
﻿ |  | $ | 3,132,200 |  | $ | 1,318 |  | $ | 79,049 |  | $ | 3,054,469 |  | $ | 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 |  | $ | 5,073 |  | $ | 5,088
Due after one year through five years |  |  | 57,191 |  |  | 57,118
Due after five years through ten years |  |  | 1,279,427 |  |  | 1,225,729
Due after ten years |  |  | 1,749,929 |  |  | 1,693,738
Total available for sale debt securities |  | $ | 3,091,620 |  | $ | 2,981,673
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Securities with Unrealized Losses |
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﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿June 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 |  | $ | 42,423 |  | $ | 1,812 |  | $ | 48,562 |  | $ | 2,672 |  | $ | 90,985 |  | $ | 4,484
﻿Municipal obligations |  |  | 54,121 |  |  | 984 |  |  | 168,133 |  |  | 7,536 |  |  | 222,254 |  |  | 8,520
﻿Residential mortgage-backed securities |  |  | 559,924 |  |  | 8,483 |  |  | 1,066,016 |  |  | 45,844 |  |  | 1,625,940 |  |  | 54,327
﻿Commercial mortgage-backed securities |  |  | 291,635 |  |  | 10,839 |  |  | 396,809 |  |  | 30,551 |  |  | 688,444 |  |  | 41,390
﻿Collateralized mortgage obligations |  |  | 115,891 |  |  | 3,007 |  |  | 30,884 |  |  | 1,146 |  |  | 146,775 |  |  | 4,153
﻿ |  | $ | 1,063,994 |  | $ | 25,125 |  | $ | 1,710,404 |  | $ | 87,749 |  | $ | 2,774,398 |  | $ | 112,874
﻿ ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿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 |  | $ | 17,258 |  | $ | 17,413
Due after one year through five years |  |  | 137,093 |  |  | 135,198
Due after five years through ten years |  |  | 1,474,871 |  |  | 1,436,090
Due after ten years |  |  | 1,502,978 |  |  | 1,465,768
Total held to maturity securities |  | $ | 3,132,200 |  | $ | 3,054,469
﻿
Securities with Unrealized Losses |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿June 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 |  | $ | — |  | $ | — |  | $ | 49,332 |  | $ | 668 |  | $ | 49,332 |  | $ | 668
﻿Municipal obligations |  |  | 364,751 |  |  | 5,081 |  |  | 220,575 |  |  | 9,085 |  |  | 585,326 |  |  | 14,166
﻿Residential mortgage-backed securities |  |  | 383,695 |  |  | 7,189 |  |  | 211,897 |  |  | 7,541 |  |  | 595,592 |  |  | 14,730
﻿Commercial mortgage-backed securities |  |  | 232,031 |  |  | 9,079 |  |  | 70,133 |  |  | 5,502 |  |  | 302,164 |  |  | 14,581
﻿Collateralized mortgage obligations |  |  | 592,423 |  |  | 8,113 |  |  | 677,684 |  |  | 26,791 |  |  | 1,270,107 |  |  | 34,904
﻿ |  | $ | 1,572,900 |  | $ | 29,462 |  | $ | 1,229,621 |  | $ | 49,587 |  | $ | 2,802,521 |  | $ | 79,049
﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿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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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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