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Securities (Tables) | 6 Months Ended
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Jun. 30, 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿(in thousands) |  | June 30, 2016 |  | December 31, 2015
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  | Gross |  | Gross |  |  |  |  |  | Gross |  | Gross |  |
﻿ |  | Amortized |  | Unrealized |  | Unrealized |  | Fair |  | Amortized |  | Unrealized |  | Unrealized |  | Fair
﻿ |  | Cost |  | Gains |  | Losses |  | Value |  | Cost |  | Gains |  | Losses |  | Value
﻿US Treasury and government agency securities |  | $ | 116 |  | $ | — |  | $ | — |  | $ | 116 |  | $ | 135 |  | $ | — |  | $ | 1 |  | $ | 134
﻿Municipal obligations |  |  | 151,557 |  |  | 4,735 |  |  | — |  |  | 156,292 |  |  | 39,410 |  |  | 235 |  |  | 38 |  |  | 39,607
﻿Mortgage-backed securities |  |  | 1,867,063 |  |  | 39,413 |  |  | 130 |  |  | 1,906,346 |  |  | 1,750,168 |  |  | 19,387 |  |  | 11,182 |  |  | 1,758,373
﻿Collateralized mortgage obligations |  |  | 238,165 |  |  | 3,181 |  |  | — |  |  | 241,346 |  |  | 291,085 |  |  | 140 |  |  | 2,192 |  |  | 289,033
﻿Corporate debt securities |  |  | 3,500 |  |  | — |  |  | — |  |  | 3,500 |  |  | 3,500 |  |  | — |  |  | — |  |  | 3,500
﻿Equity securities |  |  | 877 |  |  | 335 |  |  | — |  |  | 1,212 |  |  | 2,447 |  |  | 358 |  |  | 48 |  |  | 2,757
﻿ |  | $ | 2,261,278 |  | $ | 47,664 |  | $ | 130 |  | $ | 2,308,812 |  | $ | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿(in thousands) |  | June 30, 2016 |  | December 31, 2015
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  | Gross |  | Gross |  |  |  |  |  | Gross |  | Gross |  |
﻿ |  | Amortized |  | Unrealized |  | Unrealized |  | Fair |  | Amortized |  | Unrealized |  | Unrealized |  | Fair
﻿ |  | Cost |  | Gains |  | Losses |  | Value |  | Cost |  | Gains |  | Losses |  | Value
﻿US Treasury and government agency securities |  | $ | 50,000 |  | $ | 1,047 |  | $ | — |  | $ | 51,047 |  | $ | 50,000 |  | $ | — |  | $ | 410 |  | $ | 49,590
﻿Municipal obligations |  |  | 496,999 |  |  | 18,158 |  |  | 372 |  |  | 514,785 |  |  | 185,890 |  |  | 3,475 |  |  | 1,166 |  |  | 188,199
﻿Mortgage-backed securities |  |  | 946,722 |  |  | 40,068 |  |  | — |  |  | 986,790 |  |  | 1,014,135 |  |  | 15,585 |  |  | 1,589 |  |  | 1,028,131
﻿Collateralized mortgage obligations |  |  | 1,003,837 |  |  | 13,543 |  |  | 918 |  |  | 1,016,462 |  |  | 1,120,363 |  |  | 2,244 |  |  | 12,676 |  |  | 1,109,931
﻿ |  | $ | 2,497,558 |  | $ | 72,816 |  | $ | 1,290 |  | $ | 2,569,084 |  | $ | 2,370,388 |  | $ | 21,304 |  | $ | 15,841 |  | $ | 2,375,851
﻿
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity |
﻿ |  |  |  |  |  |
﻿ |  |  |  |  |  |
﻿(in thousands) |  | Amortized |  | Fair
﻿Debt Securities Available for Sale |  | Cost |  | Value
﻿Due in one year or less |  | $ | 6,825 |  | $ | 6,839
﻿Due after one year through five years |  |  | 53,816 |  |  | 54,914
﻿Due after five years through ten years |  |  | 391,388 |  |  | 405,008
﻿Due after ten years |  |  | 1,808,372 |  |  | 1,840,839
﻿ Total available for sale debt securities |  | $ | 2,260,401 |  | $ | 2,307,600
﻿ |  |  |  |  |  |
﻿ |  | Amortized |  | Fair
﻿Debt Securities Held to Maturity |  | Cost |  | Value
﻿Due in one year or less |  | $ | 15,700 |  | $ | 15,779
﻿Due after one year through five years |  |  | 136,327 |  |  | 140,424
﻿Due after five years through ten years |  |  | 403,112 |  |  | 416,795
﻿Due after ten years |  |  | 1,942,419 |  |  | 1,996,086
﻿ Total held to maturity securities |  | $ | 2,497,558 |  | $ | 2,569,084
﻿
Available for Sale [Member] |
Gain (Loss) on Investments [Line Items] |
Securities with Unrealized Losses |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿June 30, 2016 |  | 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
﻿US Treasury and government agency securities |  | $ | — |  |  | — |  | $ | 70 |  | $ | — |  | $ | 70 |  | $ | —
﻿Mortgage-backed securities |  |  | 13,310 |  |  | 90 |  |  | 7,929 |  |  | 40 |  |  | 21,239 |  |  | 130
﻿ |  | $ | 13,310 |  | $ | 90 |  | $ | 7,999 |  | $ | 40 |  | $ | 21,309 |  | $ | 130
﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿December 31, 2015 |  | 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
﻿US Treasury and government agency securities |  | $ | — |  | $ | — |  | $ | 82 |  | $ | 1 |  | $ | 82 |  | $ | 1
﻿Municipal obligations |  |  | 8,296 |  |  | 38 |  |  | — |  |  | — |  |  | 8,296 |  |  | 38
﻿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] |
Securities with Unrealized Losses |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿June 30, 2016 |  | 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
﻿Municipal obligations |  | $ | — |  | $ | — |  | $ | 12,476 |  | $ | 372 |  | $ | 12,476 |  | $ | 372
﻿Collateralized mortgage obligations |  |  | 1,392 |  |  | 2 |  |  | 149,600 |  |  | 916 |  |  | 150,992 |  |  | 918
﻿ |  | $ | 1,392 |  | $ | 2 |  | $ | 162,076 |  | $ | 1,288 |  | $ | 163,468 |  | $ | 1,290
﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿December 31, 2015 |  | 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
﻿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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