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Securities (Tables) | 3 Months Ended
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Mar. 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿(in thousands) |  | March 31, 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 |  | $ | 125 |  | $ | — |  | $ | — |  | $ | 125 |  | $ | 135 |  | $ | — |  | $ | 1 |  | $ | 134
﻿Municipal obligations |  |  | 87,190 |  |  | 792 |  |  | 43 |  |  | 87,939 |  |  | 39,410 |  |  | 235 |  |  | 38 |  |  | 39,607
﻿Mortgage-backed securities |  |  | 1,735,836 |  |  | 30,862 |  |  | 724 |  |  | 1,765,974 |  |  | 1,750,168 |  |  | 19,387 |  |  | 11,182 |  |  | 1,758,373
﻿Collateralized mortgage obligations |  |  | 287,171 |  |  | 2,414 |  |  | 419 |  |  | 289,166 |  |  | 291,085 |  |  | 140 |  |  | 2,192 |  |  | 289,033
﻿Corporate debt securities |  |  | 3,500 |  |  | — |  |  | — |  |  | 3,500 |  |  | 3,500 |  |  | — |  |  | — |  |  | 3,500
﻿Equity securities |  |  | 2,449 |  |  | 340 |  |  | 27 |  |  | 2,762 |  |  | 2,447 |  |  | 358 |  |  | 48 |  |  | 2,757
﻿ |  | $ | 2,116,271 |  | $ | 34,408 |  | $ | 1,213 |  | $ | 2,149,466 |  | $ | 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) |  | March 31, 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 |  | $ | 672 |  | $ | — |  | $ | 50,672 |  | $ | 50,000 |  | $ | — |  | $ | 410 |  | $ | 49,590
﻿Municipal obligations |  |  | 417,911 |  |  | 6,270 |  |  | 430 |  |  | 423,751 |  |  | 185,890 |  |  | 3,475 |  |  | 1,166 |  |  | 188,199
﻿Mortgage-backed securities |  |  | 983,146 |  |  | 34,214 |  |  | — |  |  | 1,017,360 |  |  | 1,014,135 |  |  | 15,585 |  |  | 1,589 |  |  | 1,028,131
﻿Collateralized mortgage obligations |  |  | 1,067,314 |  |  | 10,630 |  |  | 2,928 |  |  | 1,075,016 |  |  | 1,120,363 |  |  | 2,244 |  |  | 12,676 |  |  | 1,109,931
﻿ |  | $ | 2,518,371 |  | $ | 51,786 |  | $ | 3,358 |  | $ | 2,566,799 |  | $ | 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 |  | $ | 6,851 |  | $ | 6,881
﻿Due after one year through five years |  |  | 78,862 |  |  | 79,865
﻿Due after five years through ten years |  |  | 366,738 |  |  | 377,314
﻿Due after ten years |  |  | 1,661,371 |  |  | 1,682,644
﻿ Total available for sale debt securities |  | $ | 2,113,822 |  | $ | 2,146,704
﻿ |  |  |  |  |  |
﻿ |  | Amortized |  | Fair
﻿Debt Securities Held to Maturity |  | Cost |  | Value
﻿Due in one year or less |  | $ | 15,296 |  | $ | 15,408
﻿Due after one year through five years |  |  | 415,949 |  |  | 417,841
﻿Due after five years through ten years |  |  | 356,084 |  |  | 358,834
﻿Due after ten years |  |  | 1,731,042 |  |  | 1,774,716
﻿ Total held to maturity securities |  | $ | 2,518,371 |  | $ | 2,566,799
﻿
Available for Sale [Member] |
Gain (Loss) on Investments [Line Items] |
Securities with Unrealized Losses |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿March 31, 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 |  | $ | — |  |  | — |  | $ | 76 |  | $ | — |  | $ | 76 |  | $ | —
﻿Municipal obligations |  |  | 25,999 |  |  | 43 |  |  | — |  |  | — |  |  | 25,999 |  |  | 43
﻿Mortgage-backed securities |  |  | 160,058 |  |  | 170 |  |  | 69,703 |  |  | 554 |  |  | 229,761 |  |  | 724
﻿Collateralized mortgage obligations |  |  | — |  |  | — |  |  | 32,215 |  |  | 419 |  |  | 32,215 |  |  | 419
﻿Equity securities |  |  | — |  |  | — |  |  | 1,513 |  |  | 27 |  |  | 1,513 |  |  | 27
﻿ |  | $ | 186,057 |  | $ | 213 |  | $ | 103,507 |  | $ | 1,000 |  | $ | 289,564 |  | $ | 1,213
﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿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 |
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﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿March 31, 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 |  | $ | 47,173 |  | $ | 118 |  | $ | 10,792 |  | $ | 312 |  | $ | 57,965 |  | $ | 430
﻿Collateralized mortgage obligations |  |  | 8,871 |  |  | 15 |  |  | 314,160 |  |  | 2,913 |  |  | 323,031 |  |  | 2,928
﻿ |  | $ | 56,044 |  | $ | 133 |  | $ | 324,952 |  | $ | 3,225 |  | $ | 380,996 |  | $ | 3,358
﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿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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