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Securities (Tables) | 9 Months Ended
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Sep. 30, 2017
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, 2017 |  | December 31, 2016
﻿ |  |  |  | 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 |  | $ | 75,019 |  | $ | 29 |  | $ | 1,606 |  | $ | 73,442 |  | $ | 56,751 |  | $ | — |  | $ | 1,923 |  | $ | 54,828
﻿Municipal obligations |  |  | 246,805 |  |  | 534 |  |  | 4,661 |  |  | 242,678 |  |  | 253,228 |  |  | 113 |  |  | 11,186 |  |  | 242,155
﻿Residential mortgage-backed securities |  |  | 1,795,397 |  |  | 9,701 |  |  | 11,672 |  |  | 1,793,426 |  |  | 1,620,191 |  |  | 10,592 |  |  | 19,428 |  |  | 1,611,355
﻿Commercial mortgage-backed securities |  |  | 584,503 |  |  | 569 |  |  | 16,719 |  |  | 568,353 |  |  | 425,750 |  |  | — |  |  | 23,159 |  |  | 402,591
﻿Collateralized mortgage obligations |  |  | 174,119 |  |  | 114 |  |  | 354 |  |  | 173,879 |  |  | 202,580 |  |  | 490 |  |  | 591 |  |  | 202,479
﻿Corporate debt securities |  |  | 3,500 |  |  | — |  |  | — |  |  | 3,500 |  |  | 3,500 |  |  | — |  |  | — |  |  | 3,500
﻿ |  | $ | 2,879,343 |  | $ | 10,947 |  | $ | 35,012 |  | $ | 2,855,278 |  | $ | 2,562,000 |  | $ | 11,195 |  | $ | 56,287 |  | $ | 2,516,908
﻿
Amortized Cost and Fair Value of Securities Held to Maturity |
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﻿Securities Held to Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿(in thousands) |  | September 30, 2017 |  | December 31, 2016
﻿ |  |  |  | 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 |  | $ | — |  | $ | 63 |  | $ | 49,937 |  | $ | 50,000 |  | $ | — |  | $ | 44 |  | $ | 49,956
﻿Municipal obligations |  |  | 725,484 |  |  | 7,677 |  |  | 7,396 |  |  | 725,765 |  |  | 648,093 |  |  | 2,147 |  |  | 20,175 |  |  | 630,065
﻿Residential mortgage-backed securities |  |  | 760,158 |  |  | 8,896 |  |  | 776 |  |  | 768,278 |  |  | 862,162 |  |  | 4,329 |  |  | 3,068 |  |  | 863,423
﻿Commercial mortgage-backed securities |  |  | 75,688 |  |  | — |  |  | 2,592 |  |  | 73,096 |  |  | 75,739 |  |  | — |  |  | 4,038 |  |  | 71,701
﻿Collateralized mortgage obligations |  |  | 1,157,944 |  |  | 2,476 |  |  | 9,348 |  |  | 1,151,072 |  |  | 864,226 |  |  | 1,420 |  |  | 10,674 |  |  | 854,972
﻿ |  | $ | 2,769,274 |  | $ | 19,049 |  | $ | 20,175 |  | $ | 2,768,148 |  | $ | 2,500,220 |  | $ | 7,896 |  | $ | 37,999 |  | $ | 2,470,117
﻿
Available for Sale [Member] |
Gain (Loss) on Investments [Line Items] |
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 |  | $ | 5,392 |  | $ | 5,425
Due after one year through five years |  |  | 46,852 |  |  | 47,394
Due after five years through ten years |  |  | 1,097,850 |  |  | 1,082,709
Due after ten years |  |  | 1,729,249 |  |  | 1,719,750
Total available for sale debt securities |  | $ | 2,879,343 |  | $ | 2,855,278
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Securities with Unrealized Losses |
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﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿September 30, 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 |  | $ | 52,866 |  |  | 1,606 |  | $ | — |  | $ | — |  | $ | 52,866 |  | $ | 1,606
﻿Municipal obligations |  |  | 145,441 |  |  | 2,286 |  |  | 66,640 |  |  | 2,375 |  |  | 212,081 |  |  | 4,661
﻿Residential mortgage-backed securities |  |  | 1,255,266 |  |  | 11,514 |  |  | 5,360 |  |  | 158 |  |  | 1,260,626 |  |  | 11,672
﻿Commercial mortgage-backed securities |  |  | 465,596 |  |  | 15,366 |  |  | 30,151 |  |  | 1,353 |  |  | 495,747 |  |  | 16,719
﻿Collateralized mortgage obligations |  |  | 66,149 |  |  | 201 |  |  | 5,565 |  |  | 153 |  |  | 71,714 |  |  | 354
﻿ |  | $ | 1,985,318 |  | $ | 30,973 |  | $ | 107,716 |  | $ | 4,039 |  | $ | 2,093,034 |  | $ | 35,012
﻿ ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿December 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
﻿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
﻿
Held to Maturity [Member] |
Gain (Loss) on Investments [Line Items] |
Amortized Cost and Fair Value of Debt Securities by Contractual Maturity |
﻿ |  | Amortized |  | Fair
Debt Securities Held to Maturity |  | Cost |  | Value
Due in one year or less |  | $ | 10,081 |  | $ | 10,123
Due after one year through five years |  |  | 108,164 |  |  | 108,726
Due after five years through ten years |  |  | 837,353 |  |  | 833,465
Due after ten years |  |  | 1,813,676 |  |  | 1,815,834
Total held to maturity debt securities |  | $ | 2,769,274 |  | $ | 2,768,148
﻿
Securities with Unrealized Losses |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿September 30, 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 |  | $ | 49,938 |  | $ | 63 |  | $ | — |  | $ | — |  | $ | 49,938 |  | $ | 63
﻿Municipal obligations |  |  | 275,874 |  |  | 2,975 |  |  | 98,976 |  |  | 4,421 |  |  | 374,850 |  |  | 7,396
﻿Residential mortgage-backed securities |  |  | 254,743 |  |  | 776 |  |  | — |  |  | — |  |  | 254,743 |  |  | 776
﻿Commercial mortgage-backed securities |  |  | 73,096 |  |  | 2,592 |  |  | — |  |  | — |  |  | 73,096 |  |  | 2,592
﻿Collateralized mortgage obligations |  |  | 559,859 |  |  | 3,852 |  |  | 232,697 |  |  | 5,496 |  |  | 792,556 |  |  | 9,348
﻿ |  | $ | 1,213,510 |  | $ | 10,258 |  | $ | 331,673 |  | $ | 9,917 |  | $ | 1,545,183 |  | $ | 20,175
﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿December 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
﻿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
﻿

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