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Securities (Tables) | 9 Months Ended
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Sep. 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) |  | September 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 |  | $ | 20,604 |  | $ | 67 |  | $ | — |  | $ | 20,671 |  | $ | 135 |  | $ | — |  | $ | 1 |  | $ | 134
﻿Municipal obligations |  |  | 214,403 |  |  | 3,024 |  |  | 409 |  |  | 217,018 |  |  | 39,410 |  |  | 235 |  |  | 38 |  |  | 39,607
﻿Residential mortgage-backed securities |  |  | 1,737,812 |  |  | 38,204 |  |  | 91 |  |  | 1,775,925 |  |  | 1,750,168 |  |  | 19,387 |  |  | 11,182 |  |  | 1,758,373
﻿Commercial mortgage-backed securities |  |  | 172,525 |  |  | 687 |  |  | 103 |  |  | 173,109 |  |  | — |  |  | — |  |  | — |  |  | —
﻿Collateralized mortgage obligations |  |  | 220,912 |  |  | 2,344 |  |  | — |  |  | 223,256 |  |  | 291,085 |  |  | 140 |  |  | 2,192 |  |  | 289,033
﻿Corporate debt securities |  |  | 3,500 |  |  | — |  |  | — |  |  | 3,500 |  |  | 3,500 |  |  | — |  |  | — |  |  | 3,500
﻿Equity securities |  |  | 865 |  |  | 336 |  |  | — |  |  | 1,201 |  |  | 2,447 |  |  | 358 |  |  | 48 |  |  | 2,757
﻿ |  | $ | 2,370,621 |  | $ | 44,662 |  | $ | 603 |  | $ | 2,414,680 |  | $ | 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) |  | September 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 |  | $ | 860 |  | $ | — |  | $ | 50,860 |  | $ | 50,000 |  | $ | — |  | $ | 410 |  | $ | 49,590
﻿Municipal obligations |  |  | 541,839 |  |  | 11,182 |  |  | 1,462 |  |  | 551,559 |  |  | 185,890 |  |  | 3,475 |  |  | 1,166 |  |  | 188,199
﻿Residential mortgage-backed securities |  |  | 903,703 |  |  | 36,200 |  |  | — |  |  | 939,903 |  |  | 1,014,135 |  |  | 15,585 |  |  | 1,589 |  |  | 1,028,131
﻿Collateralized mortgage obligations |  |  | 932,890 |  |  | 8,767 |  |  | 1,439 |  |  | 940,218 |  |  | 1,120,363 |  |  | 2,244 |  |  | 12,676 |  |  | 1,109,931
﻿ |  | $ | 2,428,432 |  | $ | 57,009 |  | $ | 2,901 |  | $ | 2,482,540 |  | $ | 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 |  | $ | 4,864 |  | $ | 4,900
﻿Due after one year through five years |  |  | 47,593 |  |  | 48,597
﻿Due after five years through ten years |  |  | 609,897 |  |  | 621,549
﻿Due after ten years |  |  | 1,707,402 |  |  | 1,738,433
﻿ Total available for sale debt securities |  | $ | 2,369,756 |  | $ | 2,413,479
﻿ |  |  |  |  |  |
﻿ |  | Amortized |  | Fair
﻿Debt Securities Held to Maturity |  | Cost |  | Value
﻿Due in one year or less |  | $ | 14,982 |  | $ | 15,019
﻿Due after one year through five years |  |  | 135,330 |  |  | 138,737
﻿Due after five years through ten years |  |  | 510,536 |  |  | 517,652
﻿Due after ten years |  |  | 1,767,584 |  |  | 1,811,132
﻿ Total held to maturity securities |  | $ | 2,428,432 |  | $ | 2,482,540
﻿
Available for Sale [Member] |
Gain (Loss) on Investments [Line Items] |
Securities with Unrealized Losses |
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﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿September 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 |  | $ | 69,801 |  |  | 409 |  | $ | — |  |  | — |  | $ | 69,801 |  | $ | 409
﻿Residential mortgage-backed securities |  |  | 6,653 |  |  | 55 |  |  | 4,534 |  |  | 36 |  |  | 11,187 |  |  | 91
﻿Commercial mortgage-backed securities |  |  | 31,640 |  |  | 103 |  |  | — |  |  | — |  |  | 31,640 |  |  | 103
﻿Collateralized mortgage obligations |  |  | 6,910 |  |  | — |  |  | — |  |  | — |  |  | 6,910 |  |  | —
﻿ |  | $ | 115,004 |  | $ | 567 |  | $ | 4,534 |  | $ | 36 |  | $ | 119,538 |  | $ | 603
﻿ ﻿
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﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿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
﻿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] |
Securities with Unrealized Losses |
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﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿September 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 |  | $ | 98,295 |  | $ | 1,035 |  | $ | 11,843 |  | $ | 427 |  | $ | 110,138 |  | $ | 1,462
﻿Collateralized mortgage obligations |  |  | 119,172 |  |  | 146 |  |  | 132,960 |  |  | 1,293 |  |  | 252,132 |  |  | 1,439
﻿ |  | $ | 217,467 |  | $ | 1,181 |  | $ | 144,803 |  | $ | 1,720 |  | $ | 362,270 |  | $ | 2,901
﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿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
﻿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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