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Securities | 12 Months Ended
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Dec. 31, 2017
Securities [Abstract] |
Securities | Note 3. Securities ﻿ The amortized cost and fair value of securities classified as available for sale and held to maturity follow. ﻿ ﻿
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﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Securities Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | December 31, 2017 |  | December 31, 2016
﻿ |  |  |  |  | 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 |  | $ | 99,535 |  | $ | — |  | $ | 2,263 |  | $ | 97,272 |  | $ | 56,751 |  | $ | — |  | $ | 1,923 |  | $ | 54,828
﻿Municipal obligations |  |  | 245,997 |  |  | 1,135 |  |  | 3,346 |  |  | 243,786 |  |  | 253,228 |  |  | 113 |  |  | 11,186 |  |  | 242,155
﻿Residential mortgage-backed securities |  |  | 1,729,989 |  |  | 5,611 |  |  | 20,387 |  |  | 1,715,213 |  |  | 1,620,191 |  |  | 10,592 |  |  | 19,428 |  |  | 1,611,355
﻿Commercial mortgage-backed securities |  |  | 704,518 |  |  | 480 |  |  | 17,863 |  |  | 687,135 |  |  | 425,750 |  |  | — |  |  | 23,159 |  |  | 402,591
﻿Collateralized mortgage obligations |  |  | 165,518 |  |  | 4 |  |  | 1,559 |  |  | 163,963 |  |  | 202,580 |  |  | 490 |  |  | 591 |  |  | 202,479
﻿Corporate debt securities |  |  | 3,500 |  |  | — |  |  | — |  |  | 3,500 |  |  | 3,500 |  |  | — |  |  | — |  |  | 3,500
﻿ |  | $ | 2,949,057 |  | $ | 7,230 |  | $ | 45,418 |  | $ | 2,910,869 |  | $ | 2,562,000 |  | $ | 11,195 |  | $ | 56,287 |  | $ | 2,516,908
﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Securities Held to Maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | December 31, 2017 |  | December 31, 2016
﻿ |  |  |  |  | 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 |  | $ | — |  | $ | 289 |  | $ | 49,711 |  | $ | 50,000 |  | $ | — |  | $ | 44 |  | $ | 49,956
﻿Municipal obligations |  |  | 723,094 |  |  | 8,323 |  |  | 4,245 |  |  | 727,172 |  |  | 648,093 |  |  | 2,147 |  |  | 20,175 |  |  | 630,065
﻿Residential mortgage-backed securities |  |  | 725,748 |  |  | 4,175 |  |  | 2,690 |  |  | 727,233 |  |  | 862,162 |  |  | 4,329 |  |  | 3,068 |  |  | 863,423
﻿Commercial mortgage-backed securities |  |  | 317,185 |  |  | 40 |  |  | 3,915 |  |  | 313,310 |  |  | 75,739 |  |  | — |  |  | 4,038 |  |  | 71,701
﻿Collateralized mortgage obligations |  |  | 1,161,484 |  |  | 572 |  |  | 17,472 |  |  | 1,144,584 |  |  | 864,226 |  |  | 1,420 |  |  | 10,674 |  |  | 854,972
﻿ |  | $ | 2,977,511 |  | $ | 13,110 |  | $ | 28,611 |  | $ | 2,962,010 |  | $ | 2,500,220 |  | $ | 7,896 |  | $ | 37,999 |  | $ | 2,470,117
﻿ The following tables present the amortized cost and fair value of debt securities at December 31, 2017 by contractual maturity. Actual maturities will differ from contractual maturities because of rights to call or repay obligations with or without penalties and scheduled and unscheduled principal payments on mortgage-backed securities and collateral mortgage obligations. ﻿ ﻿
﻿ |  |  |  |  |  |
﻿ |  |  |  |  |  |
﻿(in thousands) |  | Amortized Cost |  | Fair Value
﻿Debt Securities Available for Sale |  |  |  |  |  |
﻿Due in one year or less |  | $ | 7,624 |  | $ | 7,658
﻿Due after one year through five years |  |  | 40,743 |  |  | 41,083
﻿Due after five years through ten years |  |  | 1,226,635 |  |  | 1,208,735
﻿Due after ten years |  |  | 1,674,055 |  |  | 1,653,393
﻿Total available for sale debt securities |  | $ | 2,949,057 |  | $ | 2,910,869
﻿ ﻿
﻿ |  |  |  |  |  |
﻿ |  |  |  |  |  |
﻿(in thousands) |  | Amortized Cost |  | Fair Value
﻿Debt Securities Held to Maturity |  |  |  |  |  |
﻿Due in one year or less |  | $ | 10,686 |  | $ | 10,695
﻿Due after one year through five years |  |  | 122,555 |  |  | 122,339
﻿Due after five years through ten years |  |  | 1,052,688 |  |  | 1,051,036
﻿Due after ten years |  |  | 1,791,582 |  |  | 1,777,940
﻿Total held to maturity debt securities |  | $ | 2,977,511 |  | $ | 2,962,010
﻿ The Company held no securities classified as trading at December 31, 2017 or 2016. ﻿ The details for securities classified as available for sale with unrealized losses as of December 31, 2017 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 |  | $ | 45,616 |  | $ | 42 |  | $ | 51,157 |  | $ | 2,221 |  | $ | 96,773 |  | $ | 2,263
﻿Municipal obligations |  |  | 2,768 |  |  | 11 |  |  | 173,530 |  |  | 3,335 |  |  | 176,298 |  |  | 3,346
﻿Residential mortgage-backed securities |  |  | 461,835 |  |  | 4,195 |  |  | 898,099 |  |  | 16,192 |  |  | 1,359,934 |  |  | 20,387
﻿Commercial mortgage-backed securities |  |  | 203,618 |  |  | 995 |  |  | 411,046 |  |  | 16,868 |  |  | 614,664 |  |  | 17,863
﻿Collateralized mortgage obligations |  |  | 128,174 |  |  | 1,076 |  |  | 35,488 |  |  | 483 |  |  | 163,662 |  |  | 1,559
﻿ |  | $ | 842,011 |  | $ | 6,319 |  | $ | 1,569,320 |  | $ | 39,099 |  | $ | 2,411,331 |  | $ | 45,418
﻿ 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 held to maturity with unrealized losses as of December 31, 2017 follow. ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Securities Held to M aturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | 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 |  | $ | — |  | $ | — |  | $ | 49,711 |  | $ | 289 |  | $ | 49,711 |  | $ | 289
﻿Municipal obligations |  |  | 14,603 |  |  | 19 |  |  | 230,960 |  |  | 4,226 |  |  | 245,563 |  |  | 4,245
﻿Residential mortgage-backed securities |  |  | 8,815 |  |  | 99 |  |  | 230,277 |  |  | 2,591 |  |  | 239,092 |  |  | 2,690
﻿Commercial mortgage-backed securities |  |  | 174,882 |  |  | 744 |  |  | 72,499 |  |  | 3,171 |  |  | 247,381 |  |  | 3,915
﻿Collateralized mortgage obligations |  |  | 570,289 |  |  | 5,653 |  |  | 472,536 |  |  | 11,819 |  |  | 1,042,825 |  |  | 17,472
﻿ |  | $ | 768,589 |  | $ | 6,515 |  | $ | 1,055,983 |  | $ | 22,096 |  | $ | 1,824,572 |  | $ | 28,611
﻿ The details for securities classified as held to maturity with unrealized losses as of December 31, 2016 follow. ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Securities 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 unrealized losses primarily relate to changes in market rates on fixed rate debt securities since the respective purchase date. In all cases, the indicated impairment on these debt securities would be recovered no later than the security’s maturity date or possibly earlier if the market price for the security increases with a reduction in the yield required by the market. None of the unrealized losses relate to the marketability of the securities or the issuers’ abilities to meet contractual obligations. The Company believes it has adequate liquidity and, therefore, does not plan to and, more likely than not, will not be required to sell these securities before recovery of the indicated impairment. Accordingly, the unrealized losses on these securities have been determined to be temporary. ﻿ Proceeds from sales of securities were approximately $21 3.9 million in 2017, $173.2 million in 2016, and $9.3 million in 2015. No gross gains or losses were recognized on sales of securities in 2017. Gross gains of approximately $2.0 million and gross losses of approximately $0.2 million were recognized on sales of securities in 2016. ﻿ Securities with carrying values totaling approximately $3.3 billion at December 31, 201 7 and $3.8 billion at December 31, 2016 were pledged primarily to secure public deposits or sold under agreements to repur chase.

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