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Securities (Tables) | 12 Months Ended
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Dec. 31, 2016
Gain (Loss) on Investments [Line Items] |
Amortized Cost and Fair Value of Securities Available for Sale |
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﻿Securities Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | December 31, 2016 |  | December 31, 2015
﻿ |  |  |  |  | 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 |  | $ | 56,751 |  | $ | — |  | $ | 1,923 |  | $ | 54,828 |  | $ | 135 |  | $ | — |  | $ | 1 |  | $ | 134
﻿Municipal obligations |  |  | 253,228 |  |  | 113 |  |  | 11,186 |  |  | 242,155 |  |  | 39,410 |  |  | 235 |  |  | 38 |  |  | 39,607
﻿Residential mortgage-backed securities |  |  | 1,620,191 |  |  | 10,592 |  |  | 19,428 |  |  | 1,611,355 |  |  | 1,750,168 |  |  | 19,387 |  |  | 11,182 |  |  | 1,758,373
﻿Commercial mortgage-backed securities |  |  | 425,750 |  |  | — |  |  | 23,159 |  |  | 402,591 |  |  | — |  |  | — |  |  | — |  |  | —
﻿Collateralized mortgage obligations |  |  | 202,580 |  |  | 490 |  |  | 591 |  |  | 202,479 |  |  | 291,085 |  |  | 140 |  |  | 2,192 |  |  | 289,033
﻿Corporate debt securities |  |  | 3,500 |  |  | — |  |  | — |  |  | 3,500 |  |  | 3,500 |  |  | — |  |  | — |  |  | 3,500
﻿Equity securities |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 2,447 |  |  | 358 |  |  | 48 |  |  | 2,757
﻿ |  | $ | 2,562,000 |  | $ | 11,195 |  | $ | 56,287 |  | $ | 2,516,908 |  | $ | 2,086,745 |  | $ | 20,120 |  | $ | 13,461 |  | $ | 2,093,404
﻿
Amortized Cost and Fair Value of Securities Held to Maturity |
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﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Securities Held to Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | December 31, 2016 |  | December 31, 2015
﻿ |  |  |  |  | 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 |  | $ | — |  | $ | 44 |  | $ | 49,956 |  | $ | 50,000 |  | $ | — |  | $ | 410 |  | $ | 49,590
﻿Municipal obligations |  |  | 648,093 |  |  | 2,147 |  |  | 20,175 |  |  | 630,065 |  |  | 185,890 |  |  | 3,475 |  |  | 1,166 |  |  | 188,199
﻿Residential mortgage-backed securities |  |  | 862,162 |  |  | 4,329 |  |  | 3,068 |  |  | 863,423 |  |  | 1,014,135 |  |  | 15,585 |  |  | 1,589 |  |  | 1,028,131
﻿Commercial mortgage-backed securities |  |  | 75,739 |  |  | — |  |  | 4,038 |  |  | 71,701 |  |  | — |  |  | — |  |  | — |  |  | —
﻿Collateralized mortgage obligations |  |  | 864,226 |  |  | 1,420 |  |  | 10,674 |  |  | 854,972 |  |  | 1,120,363 |  |  | 2,244 |  |  | 12,676 |  |  | 1,109,931
﻿ |  | $ | 2,500,220 |  | $ | 7,896 |  | $ | 37,999 |  | $ | 2,470,117 |  | $ | 2,370,388 |  | $ | 21,304 |  | $ | 15,841 |  | $ | 2,375,851
﻿
Available for Sale [Member] |
Gain (Loss) on Investments [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 |  | $ | 4,523 |  | $ | 4,536
﻿Due after one year through five years |  |  | 42,881 |  |  | 43,424
﻿Due after five years through ten years |  |  | 992,327 |  |  | 964,119
﻿Due after ten years |  |  | 1,522,269 |  |  | 1,504,829
﻿Total available for sale debt securities |  | $ | 2,562,000 |  | $ | 2,516,908
﻿
Securities with Unrealized Losses | The details for securities classified as available for sale with unrealized losses as of December 31, 2016 follow: ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿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 |  | $ | 54,788 |  | $ | 1,923 |  | $ | — |  | $ | — |  | $ | 54,788 |  | $ | 1,923
﻿Municipal obligations |  |  | 228,588 |  |  | 11,186 |  |  | — |  |  | — |  |  | 228,588 |  |  | 11,186
﻿Residential mortgage-backed securities |  |  | 1,087,644 |  |  | 19,359 |  |  | 3,738 |  |  | 69 |  |  | 1,091,382 |  |  | 19,428
﻿Commercial mortgage-backed securities |  |  | 402,591 |  |  | 23,159 |  |  | — |  |  | — |  |  | 402,591 |  |  | 23,159
﻿Collateralized mortgage obligations |  |  | 83,701 |  |  | 591 |  |  | — |  |  | — |  |  | 83,701 |  |  | 591
﻿ |  | $ | 1,857,312 |  | $ | 56,218 |  | $ | 3,738 |  | $ | 69 |  | $ | 1,861,050 |  | $ | 56,287
﻿ The details for securities classified as available for sale with unrealized losses as of December 31, 2015 follow: ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿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 |  | $ | — |  | $ | — |  | $ | 82 |  | $ | 1 |  | $ | 82 |  | $ | 1
﻿Municipal obligations |  |  | 8,296 |  |  | 38 |  |  | — |  |  | — |  |  | 8,296 |  |  | 38
﻿Residential mortgage-backed securities |  |  | 831,156 |  |  | 8,257 |  |  | 116,126 |  |  | 2,925 |  |  | 947,282 |  |  | 11,182
﻿Collateralized mortgage obligations |  |  | 208,397 |  |  | 1,257 |  |  | 33,138 |  |  | 935 |  |  | 241,535 |  |  | 2,192
﻿Equity securities |  |  | 20 |  |  | 1 |  |  | 1,473 |  |  | 47 |  |  | 1,493 |  |  | 48
﻿ |  | $ | 1,047,869 |  | $ | 9,553 |  | $ | 150,819 |  | $ | 3,908 |  | $ | 1,198,688 |  | $ | 13,461
﻿
Held to Maturity [Member] |
Gain (Loss) on Investments [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 |  | $ | 6,727 |  | $ | 6,740
﻿Due after one year through five years |  |  | 135,187 |  |  | 136,268
﻿Due after five years through ten years |  |  | 691,248 |  |  | 668,507
﻿Due after ten years |  |  | 1,667,058 |  |  | 1,658,602
﻿Total held to maturity debt securities |  | $ | 2,500,220 |  | $ | 2,470,117
﻿
Securities with Unrealized Losses | The details for securities classified as held to maturity with unrealized losses as of December 31, 2016 follow: ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿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 |  | $ | 49,956 |  | $ | 44 |  | $ | — |  | $ | — |  | $ | 49,956 |  | $ | 44
﻿Municipal obligations |  |  | 494,470 |  |  | 19,706 |  |  | 11,750 |  |  | 469 |  |  | 506,220 |  |  | 20,175
﻿Residential mortgage-backed securities |  |  | 278,369 |  |  | 3,068 |  |  | — |  |  | — |  |  | 278,369 |  |  | 3,068
﻿Commercial mortgage-backed securities |  |  | 71,701 |  |  | 4,038 |  |  | — |  |  | — |  |  | 71,701 |  |  | 4,038
﻿Collateralized mortgage obligations |  |  | 618,739 |  |  | 7,296 |  |  | 115,375 |  |  | 3,378 |  |  | 734,114 |  |  | 10,674
﻿ |  | $ | 1,513,235 |  | $ | 34,152 |  | $ | 127,125 |  | $ | 3,847 |  | $ | 1,640,360 |  | $ | 37,999
﻿ The details for securities classified as held to maturity with unrealized losses as of December 31, 2015 follow: ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿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 |  | $ | 45,590 |  | $ | 410 |  | $ | — |  | $ | — |  | $ | 45,590 |  | $ | 410
﻿Municipal obligations |  |  | 22,652 |  |  | 301 |  |  | 48,727 |  |  | 865 |  |  | 71,379 |  |  | 1,166
﻿Residential mortgage-backed securities |  |  | 349,635 |  |  | 1,589 |  |  | — |  |  | — |  |  | 349,635 |  |  | 1,589
﻿Collateralized mortgage obligations |  |  | 516,330 |  |  | 2,894 |  |  | 370,756 |  |  | 9,782 |  |  | 887,086 |  |  | 12,676
﻿ |  | $ | 934,207 |  | $ | 5,194 |  | $ | 419,483 |  | $ | 10,647 |  | $ | 1,353,690 |  | $ | 15,841
﻿

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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=73527792&loc=d3e27290-111563 + Details
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