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Securities (Tables) | 12 Months Ended
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Dec. 31, 2016
Summary of Portfolio of Securities Available for Sale | The following tables summarize the Company’s portfolio of securities available for sale at December 31, 2016 and 2015:
|  | December 31, 2016 |
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |
Mortgage-Related Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
GSE(1) certificates |  | $ | 7,786 |  |  | $ | — |  |  | $ | 460 |  |  | $ | 7,326 |
Other Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 583 |  |  | $ | 48 |  |  | $ | — |  |  | $ | 631 |
Capital trust notes |  |  | 9,458 |  |  |  | 2 |  |  |  | 2,217 |  |  |  | 7,243 |
Preferred stock |  |  | 70,866 |  |  |  | 1,446 |  |  |  | 328 |  |  |  | 71,984 |
Mutual funds and common stock (2) |  |  | 16,874 |  |  |  | 484 |  |  |  | 261 |  |  |  | 17,097 |
Total other securities |  | $ | 97,781 |  |  | $ | 1,980 |  |  | $ | 2,806 |  |  | $ | 96,955 |
Total securities available for sale |  | $ | 105,567 |  |  | $ | 1,980 |  |  | $ | 3,266 |  |  | $ | 104,281 |
(1) | Government-sponsored enterprise.
(2) | Primarily consists of mutual funds that are Community Reinvestment Act-qualified investments.
|  | December 31, 2015 |
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |
Mortgage-Related Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
GSE certificates |  | $ | 53,820 |  |  | $ | 33 |  |  | $ | 1 |  |  | $ | 53,852 |
Other Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal bonds |  | $ | 725 |  |  | $ | 70 |  |  | $ | — |  |  | $ | 795 |
Capital trust notes |  |  | 9,444 |  |  |  | — |  |  |  | 2,480 |  |  |  | 6,964 |
Preferred stock |  |  | 118,205 |  |  |  | 7,415 |  |  |  | 248 |  |  |  | 125,372 |
Mutual funds and common stock |  |  | 16,877 |  |  |  | 470 |  |  |  | 75 |  |  |  | 17,272 |
Total other securities |  | $ | 145,251 |  |  | $ | 7,955 |  |  | $ | 2,803 |  |  | $ | 150,403 |
Total securities available for sale |  | $ | 199,071 |  |  | $ | 7,988 |  |  | $ | 2,804 |  |  | $ | 204,255 |
Summary of Portfolio of Securities Held to Maturity | The following tables summarize the Company’s portfolio of securities held to maturity at December 31, 2016 and 2015:
|  | December 31, 2016 |
(in thousands) |  | Amortized Cost |  |  | Carrying Amount |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |
Mortgage-Related Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
GSE certificates |  | $ | 2,193,489 |  |  | $ | 2,193,489 |  |  | $ | 64,431 |  |  | $ | 2,399 |  |  | $ | 2,255,521 |
GSE CMOs (1) |  |  | 1,019,074 |  |  |  | 1,019,074 |  |  |  | 36,895 |  |  |  | 57 |  |  |  | 1,055,912 |
Total mortgage-related securities |  | $ | 3,212,563 |  |  | $ | 3,212,563 |  |  | $ | 101,326 |  |  | $ | 2,456 |  |  | $ | 3,311,433 |
Other Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U. S. Treasury obligations |  | $ | 200,293 |  |  | $ | 200,293 |  |  | $ | — |  |  | $ | 73 |  |  | $ | 200,220 |
GSE debentures |  |  | 88,457 |  |  |  | 88,457 |  |  |  | 3,836 |  |  |  | — |  |  |  | 92,293 |
Corporate bonds |  |  | 74,217 |  |  |  | 74,217 |  |  |  | 9,549 |  |  |  | — |  |  |  | 83,766 |
Municipal bonds |  |  | 71,554 |  |  |  | 71,554 |  |  |  | — |  |  |  | 1,789 |  |  |  | 69,765 |
Capital trust notes |  |  | 74,284 |  |  |  | 65,692 |  |  |  | 2,662 |  |  |  | 11,872 |  |  |  | 56,482 |
Total other securities |  | $ | 508,805 |  |  | $ | 500,213 |  |  | $ | 16,047 |  |  | $ | 13,734 |  |  | $ | 502,526 |
Total securities held to maturity (2) |  | $ | 3,721,368 |  |  | $ | 3,712,776 |  |  | $ | 117,373 |  |  | $ | 16,190 |  |  | $ | 3,813,959 |
(1) | Collateralized mortgage obligations.
(2) | Held-to-maturity securities are reported at a carrying amount equal to amortized cost less the non-credit portion of OTTI recorded in AOCL. At December 31, 2016, the non-credit portion of OTTI recorded in AOCL was $8.6 million (before taxes).
|  | December 31, 2015 |
(in thousands) |  | Amortized Cost |  |  | Carrying Amount |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |
Mortgage-Related Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
GSE certificates |  | $ | 2,269,828 |  |  | $ | 2,269,828 |  |  | $ | 76,827 |  |  | $ | 4,722 |  |  | $ | 2,341,933 |
GSE CMOs |  |  | 1,325,033 |  |  |  | 1,325,033 |  |  |  | 53,236 |  |  |  | 57 |  |  |  | 1,378,212 |
Total mortgage-related securities |  | $ | 3,594,861 |  |  | $ | 3,594,861 |  |  | $ | 130,063 |  |  | $ | 4,779 |  |  | $ | 3,720,145 |
Other Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
GSE debentures |  | $ | 2,159,856 |  |  | $ | 2,159,856 |  |  | $ | 23,892 |  |  | $ | 7,568 |  |  | $ | 2,176,180 |
Corporate bonds |  |  | 73,756 |  |  |  | 73,756 |  |  |  | 10,503 |  |  |  | — |  |  |  | 84,259 |
Municipal bonds |  |  | 75,317 |  |  |  | 75,317 |  |  |  | 262 |  |  |  | 1,084 |  |  |  | 74,495 |
Capital trust notes |  |  | 74,317 |  |  |  | 65,600 |  |  |  | 3,750 |  |  |  | 15,900 |  |  |  | 53,450 |
Total other securities |  | $ | 2,383,246 |  |  | $ | 2,374,529 |  |  | $ | 38,407 |  |  | $ | 24,552 |  |  | $ | 2,388,384 |
Total securities held to maturity (1) |  | $ | 5,978,107 |  |  | $ | 5,969,390 |  |  | $ | 168,470 |  |  | $ | 29,331 |  |  | $ | 6,108,529 |
(1) | Held-to-maturity securities are reported at a carrying amount equal to amortized cost less the non-credit portion of OTTI recorded in AOCL. At December 31, 2015, the non-credit portion of OTTI recorded in AOCL was $8.7 million (before taxes).
Summary of Gross Proceeds and Gross Realized Gains and Losses from Sale of Available-for-Sale Securities | The following table summarizes the gross proceeds, gross realized gains, and gross realized losses from the sale of available-for-sale securities during the years ended December 31, 2016, 2015, and 2014:
|  | December 31, |
(in thousands) |  | 2016 |  |  | 2015 |  |  | 2014 |
Gross proceeds |  | $ | 322,038 |  |  | $ | 278,689 |  |  | $ | 333,725 |
Gross realized gains |  |  | 3,128 |  |  |  | 1,159 |  |  |  | 6,186 |
Gross realized losses |  |  | — |  |  |  | 4 |  |  |  | — |
Credit Loss Component of Other Than Temporary Impairment on Debt Securities | In the following table, the beginning balance represents the credit loss component for debt securities on which OTTI occurred prior to January 1, 2016. For credit-impaired debt securities, OTTI recognized in earnings after that date is presented as an addition in two components, based upon whether the current period is the first time a debt security was credit-impaired (initial credit impairment) or is not the first time a debt security was credit-impaired (subsequent credit impairment).
(in thousands) |  | For the Twelve Months Ended December 31, 2016 |
Beginning credit loss amount as of December 31, 2015 |  | $ | 198,766 |
Add: Initial other-than-temporary credit losses |  |  | — |
Subsequent other-than-temporary credit losses |  |  | — |
Amount previously recognized in AOCL |  |  | — |
Less: Realized losses for securities sold |  |  | — |
Securities intended or required to be sold |  |  | — |
Increase in cash flows on debt securities |  |  | 1,214 |
Ending credit loss amount as of December 31, 2016 |  | $ | 197,552 |
Summary of Carrying Amount and Estimated Fair Value of Held-to-Maturity Debt Securities and Amortized Cost and Estimated Fair Value of Available-for-Sale Debt Securities by Contractual Maturity | The following table summarizes, by contractual maturity, the carrying amounts and estimated fair values of held-to-maturity mortgage-backed securities and debt securities, and the amortized costs and estimated fair values of available-for-sale securities, at December 31, 2016:
|  | At December 31, 2016 |  |  |  |
(dollars in thousands) |  | Mortgage- Related Securities |  |  | Average Yield |  |  | U.S. Treasury and GSE Obligations |  |  | Average Yield |  |  | State, County, and Municipal |  |  | Average Yield (1) |  |  | Other Debt Securities (2) |  |  | Average Yield |  |  | Fair Value |
Held-to-Maturity Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due within one year |  | $ | — |  |  |  | — | % |  | $ | 200,293 |  |  |  | 0.60 | % |  | $ | — |  |  |  | — | % |  | $ | — |  |  |  | — | % |  | $ | 200,220 |
Due from one to five years |  |  | 648,801 |  |  |  | 3.68 |  |  |  | 66,534 |  |  |  | 4.14 |  |  |  | — |  |  |  | — |  |  |  | 48,064 |  |  |  | 3.34 |  |  |  | 802,256 |
Due from five to ten years |  |  | 2,233,393 |  |  |  | 3.10 |  |  |  | 21,923 |  |  |  | 3.52 |  |  |  | — |  |  |  | — |  |  |  | 26,153 |  |  |  | 9.06 |  |  |  | 2,350,628 |
Due after ten years |  |  | 330,369 |  |  |  | 2.96 |  |  |  | — |  |  |  | — |  |  |  | 71,554 |  |  |  | 2.88 |  |  |  | 65,692 |  |  |  | 4.73 |  |  |  | 460,855 |
Total securities held to maturity |  | $ | 3,212,563 |  |  |  | 3.20 | % |  | $ | 288,750 |  |  |  | 1.64 | % |  | $ | 71,554 |  |  |  | 2.88 | % |  | $ | 139,909 |  |  |  | 5.06 | % |  | $ | 3,813,959 |
Available-for-Sale Securities: (3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due within one year |  | $ | — |  |  |  | — | % |  | $ | — |  |  |  | — | % |  | $ | 149 |  |  |  | 6.47 | % |  | $ | — |  |  |  | — | % |  | $ | 155 |
Due from one to five years |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 434 |  |  |  | 6.59 |  |  |  | — |  |  |  | — |  |  |  | 476 |
Due from five to ten years |  |  | 7,786 |  |  |  | 1.90 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 7,326 |
Due after ten years |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 9,458 |  |  |  | 4.66 |  |  |  | 7,243 |
Total securities available for sale |  | $ | 7,786 |  |  |  | 1.90 | % |  | $ | — |  |  |  | — | % |  | $ | 583 |  |  |  | 6.56 | % |  | $ | 9,458 |  |  |  | 4.66 | % |  | $ | 15,200 |
(1) | Not presented on a tax-equivalent basis.
(2) | Includes corporate bonds and capital trust notes.
(3) | As equity securities have no contractual maturity, they have been excluded from this table.
Summary of Held-to-Maturity and Available-for-Sale Securities having Continuous Unrealized Loss Position | The following table presents held-to-maturity and available-for-sale securities having a continuous unrealized loss position for less than twelve months and for twelve months or longer as of December 31, 2016:
At December 31, 2016 |  | Less than Twelve Months |  |  | Twelve Months or Longer |  |  | Total |
(in thousands) |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
Temporarily Impaired Held-to-Maturity Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
GSE certificates |  | $ | 268,891 |  |  | $ | 2,399 |  |  | $ | — |  |  | $ | — |  |  | $ | 268,891 |  |  | $ | 2,399 |
GSE CMOs |  |  | 42,980 |  |  |  | 57 |  |  |  | — |  |  |  | — |  |  |  | 42,980 |  |  |  | 57 |
U. S. Treasury obligations |  |  | 200,220 |  |  |  | 73 |  |  |  | — |  |  |  | — |  |  |  | 200,220 |  |  |  | 73 |
Municipal bonds |  |  | 69,765 |  |  |  | 1,789 |  |  |  | — |  |  |  | — |  |  |  | 69,765 |  |  |  | 1,789 |
Capital trust notes |  |  | — |  |  |  | — |  |  |  | 24,364 |  |  |  | 11,872 |  |  |  | 24,364 |  |  |  | 11,872 |
Total temporarily impaired held-to-maturity securities |  | $ | 581,856 |  |  | $ | 4,318 |  |  | $ | 24,364 |  |  | $ | 11,872 |  |  | $ | 606,220 |  |  | $ | 16,190 |
Temporarily Impaired Available-for-Sale Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
GSE certificates |  | $ | 7,326 |  |  | $ | 460 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,326 |  |  | $ | 460 |
Capital trust notes |  |  | — |  |  |  | — |  |  |  | 5,241 |  |  |  | 2,217 |  |  |  | 5,241 |  |  |  | 2,217 |
Equity securities |  |  | 29,059 |  |  |  | 589 |  |  |  | — |  |  |  | — |  |  |  | 29,059 |  |  |  | 589 |
Total temporarily impaired available-for-sale securities |  | $ | 36,385 |  |  | $ | 1,049 |  |  | $ | 5,241 |  |  | $ | 2,217 |  |  | $ | 41,626 |  |  | $ | 3,266 |
The following table presents held-to-maturity and available-for-sale securities having a continuous unrealized loss position for less than twelve months and for twelve months or longer as of December 31, 2015:
At December 31, 2015 |  | Less than Twelve Months |  |  | Twelve Months or Longer |  |  | Total |
(in thousands) |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
Temporarily Impaired Held-to-Maturity Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
GSE debentures |  | $ | 547,484 |  |  | $ | 728 |  |  | $ | 1,176,949 |  |  | $ | 6,840 |  |  | $ | 1,724,433 |  |  | $ | 7,568 |
GSE certificates |  |  | 299,019 |  |  |  | 4,608 |  |  |  | 3,899 |  |  |  | 114 |  |  |  | 302,918 |  |  |  | 4,722 |
GSE CMOs |  |  | 9,943 |  |  |  | 57 |  |  |  | — |  |  |  | — |  |  |  | 9,943 |  |  |  | 57 |
Municipal bonds |  |  | 42,083 |  |  |  | 1,084 |  |  |  | — |  |  |  | — |  |  |  | 42,083 |  |  |  | 1,084 |
Capital trust notes |  |  | 24,601 |  |  |  | 399 |  |  |  | 20,710 |  |  |  | 15,501 |  |  |  | 45,311 |  |  |  | 15,900 |
Total temporarily impaired held-to-maturity securities |  | $ | 923,130 |  |  | $ | 6,876 |  |  | $ | 1,201,558 |  |  | $ | 22,455 |  |  | $ | 2,124,688 |  |  | $ | 29,331 |
Temporarily Impaired Available-for-Sale Securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
GSE certificates |  | $ | 51,959 |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | 51,959 |  |  | $ | 1 |
Capital trust notes |  |  | 1,968 |  |  |  | 32 |  |  |  | 4,997 |  |  |  | 2,448 |  |  |  | 6,965 |  |  |  | 2,480 |
Equity securities |  |  | 51,775 |  |  |  | 323 |  |  |  | — |  |  |  | — |  |  |  | 51,775 |  |  |  | 323 |
Total temporarily impaired available-for-sale securities |  | $ | 105,702 |  |  | $ | 356 |  |  | $ | 4,997 |  |  | $ | 2,448 |  |  | $ | 110,699 |  |  | $ | 2,804 |

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- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27357-111563 + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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