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Investment Securities | 6 Months Ended
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Jun. 30, 2015
Investments, Debt and Equity Securities [Abstract] |
Investment Securities | Investment Securities The following table presents the amortized cost and estimated fair values of investment securities, which were all classified as available for sale:
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
| (in thousands)
June 30, 2015 |  |  |  |  |  |  |
Equity securities | $ | 23,981 |  |  | $ | 9,072 |  |  | $ | (12 | ) |  | $ | 33,041 |
U.S. Government sponsored agency securities | 48,333 |  |  | 57 |  |  | (130 | ) |  | 48,260 |
State and municipal securities | 231,592 |  |  | 5,312 |  |  | (387 | ) |  | 236,517 |
Corporate debt securities | 98,756 |  |  | 3,183 |  |  | (4,767 | ) |  | 97,172 |
Collateralized mortgage obligations | 931,093 |  |  | 4,932 |  |  | (17,793 | ) |  | 918,232 |
Mortgage-backed securities | 998,418 |  |  | 14,112 |  |  | (3,866 | ) |  | 1,008,664 |
Auction rate securities | 106,504 |  |  | — |  |  | (7,898 | ) |  | 98,606 |
| $ | 2,438,677 |  |  | $ | 36,668 |  |  | $ | (34,853 | ) |  | $ | 2,440,492 |
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
| (in thousands)
December 31, 2014 |  |  |  |  |  |  |
Equity securities | $ | 33,469 |  |  | $ | 14,167 |  |  | $ | (13 | ) |  | $ | 47,623 |
U.S. Government securities | 200 |  |  | — |  |  | — |  |  | 200 |
U.S. Government sponsored agency securities | 209 |  |  | 5 |  |  | — |  |  | 214 |
State and municipal securities | 238,250 |  |  | 7,231 |  |  | (266 | ) |  | 245,215 |
Corporate debt securities | 99,016 |  |  | 5,126 |  |  | (6,108 | ) |  | 98,034 |
Collateralized mortgage obligations | 917,395 |  |  | 5,705 |  |  | (20,787 | ) |  | 902,313 |
Mortgage-backed securities | 914,797 |  |  | 16,978 |  |  | (2,944 | ) |  | 928,831 |
Auction rate securities | 108,751 |  |  | — |  |  | (7,810 | ) |  | 100,941 |
| $ | 2,312,087 |  |  | $ | 49,212 |  |  | $ | (37,928 | ) |  | $ | 2,323,371 |
Securities carried at $1.6 billion as of June 30, 2015 and $1.7 billion as of December 31, 2014 were pledged as collateral to secure public and trust deposits and customer repurchase agreements. Equity securities include common stocks of financial institutions (estimated fair value of $27.2 million at June 30, 2015 and $41.8 million at December 31, 2014) and other equity investments (estimated fair value of $5.8 million at both June 30, 2015 and December 31, 2014). As of June 30, 2015, the financial institutions stock portfolio had a cost basis of $18.2 million and an estimated fair value of $27.2 million, including an investment in a single financial institution with a cost basis of $10.7 million and an estimated fair value of $15.7 million. The estimated fair value of this investment accounted for 57.7% of the estimated fair value of the Corporation's investments in the common stocks of publicly traded financial institutions. No other investment within the financial institutions stock portfolio exceeded 5% of the portfolio's estimated fair value. The amortized cost and estimated fair values of debt securities as of June 30, 2015, by contractual maturity, are shown in the following table. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
|  | Amortized Cost |  | Estimated Fair Value
| (in thousands)
Due in one year or less |  | $ | 57,382 |  |  | $ | 58,372 |
Due from one year to five years |  | 104,022 |  |  | 106,663 |
Due from five years to ten years |  | 148,682 |  |  | 151,430 |
Due after ten years |  | 175,099 |  |  | 164,090 |
|  | 485,185 |  |  | 480,555 |
Collateralized mortgage obligations |  | 931,093 |  |  | 918,232 |
Mortgage-backed securities |  | 998,418 |  |  | 1,008,664 |
|  | $ | 2,414,696 |  |  | $ | 2,407,451 |
The following table presents information related to the gross realized gains and losses on the sales of equity and debt securities:
| Gross Realized Gains |  | Gross Realized Losses |  | Other-than- temporary Impairment Losses |  | Net Gains (Losses)
Three months ended June 30, 2015 | (in thousands)
Equity securities | $ | 2,290 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,290 |
Debt securities | 125 |  |  | — |  |  | — |  |  | 125 |
Total | $ | 2,415 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,415 |
Three months ended June 30, 2014 |  |  |  |  |  |  |
Equity securities | $ | — |  |  | $ | — |  |  | $ | (12 | ) |  | $ | (12 | )
Debt securities | 1,124 |  |  | — |  |  | — |  |  | 1,124 |
Total | $ | 1,124 |  |  | $ | — |  |  | $ | (12 | ) |  | $ | 1,112 |
Six months ended June 30, 2015 |  |  |  |  |  |  |
Equity securities | $ | 4,260 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,260 |
Debt securities | 2,300 |  |  | — |  |  | — |  |  | 2,300 |
Total | $ | 6,560 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,560 |
Six months ended June 30, 2014 |  |  |  |  |  |  |
Equity securities | $ | 1 |  |  | $ | — |  |  | $ | (12 | ) |  | $ | (11 | )
Debt securities | 1,446 |  |  | (323 | ) |  | — |  |  | 1,123 |
Total | $ | 1,447 |  |  | $ | (323 | ) |  | $ | (12 | ) |  | $ | 1,112 |
The following table presents a summary of the cumulative credit related other-than-temporary impairment charges, recognized as components of earnings, for debt securities held by the Corporation at June 30, 2015 and 2014:
| Three months ended June 30 |  | Six months ended June 30
| 2015 |  | 2014 |  | 2015 |  | 2014
| (in thousands)
Balance of cumulative credit losses on debt securities, beginning of period | $ | (12,302 | ) |  | $ | (19,961 | ) |  | $ | (16,242 | ) |  | $ | (20,691 | )
Reductions for securities sold during the period | 792 |  |  | 2,746 |  |  | 4,730 |  |  | 3,472 |
Reductions for increases in cash flows expected to be collected that are recognized over the remaining life of the security | — |  |  | 1 |  |  | 2 |  |  | 5 |
Balance of cumulative credit losses on debt securities, end of period | $ | (11,510 | ) |  | $ | (17,214 | ) |  | $ | (11,510 | ) |  | $ | (17,214 | )
The following table presents the gross unrealized losses and estimated fair values of investments, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at June 30, 2015:
| Less than 12 months |  | 12 months or longer |  | Total
| Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses
| (in thousands)
U.S. Government sponsored agency securities | $ | 28,051 |  |  | $ | (130 | ) |  | $ | — |  |  | $ | — |  |  | $ | 28,051 |  |  | $ | (130 | )
State and municipal securities | 34,107 |  |  | (387 | ) |  | — |  |  | — |  |  | 34,107 |  |  | (387 | )
Corporate debt securities | 7,965 |  |  | (13 | ) |  | 35,229 |  |  | (4,754 | ) |  | 43,194 |  |  | (4,767 | )
Collateralized mortgage obligations | 95,315 |  |  | (651 | ) |  | 517,338 |  |  | (17,142 | ) |  | 612,653 |  |  | (17,793 | )
Mortgage-backed securities | 306,980 |  |  | (2,498 | ) |  | 69,029 |  |  | (1,368 | ) |  | 376,009 |  |  | (3,866 | )
Auction rate securities | — |  |  | — |  |  | 98,606 |  |  | (7,898 | ) |  | 98,606 |  |  | (7,898 | )
Total debt securities | 472,418 |  |  | (3,679 | ) |  | 720,202 |  |  | (31,162 | ) |  | 1,192,620 |  |  | (34,841 | )
Equity securities | — |  |  | — |  |  | 78 |  |  | (12 | ) |  | 78 |  |  | (12 | )
| $ | 472,418 |  |  | $ | (3,679 | ) |  | $ | 720,280 |  |  | $ | (31,174 | ) |  | $ | 1,192,698 |  |  | $ | (34,853 | )
The Corporation’s collateralized mortgage obligations and mortgage-backed securities have contractual terms that generally do not permit the issuer to settle the securities at a price less than the amortized cost of the investment. Because the decline in market value of these securities is attributable to changes in interest rates and not credit quality, and because the Corporation does not have the intent to sell and does not believe it will more likely than not be required to sell any of these securities prior to a recovery of their fair value to amortized cost, the Corporation does not consider these investments to be other-than-temporarily impaired as of June 30, 2015. The unrealized holding losses on auction rate securities (auction rate certificates, or "ARCs"), are attributable to liquidity issues resulting from the failure of periodic auctions. The Corporation had previously purchased ARCs for investment management and trust customers as short-term investments with fair values that could be derived based on periodic auctions under normal market conditions. During 2008 and 2009, the Corporation purchased ARCs from these customers due to the failure of these periodic auctions, which made these previously short-term investments illiquid. As of June 30, 2015, all of the ARCs were rated above investment grade, with approximately $6 million, or 6%, "AAA" rated and $93 million, or 94%, "AA" rated. All of the loans underlying the ARCs have principal payments which are guaranteed by the federal government. As of June 30, 2015, all ARCs were current and making scheduled interest payments. Based on management’s evaluations, ARCs with an estimated fair value of $98.6 million were not subject to any other-than-temporary impairment charges as of June 30, 2015. The Corporation does not have the intent to sell and does not believe it will more likely than not be required to sell any of these securities prior to a recovery of their fair value to amortized cost, which may be at maturity. For its investments in equity securities, particularly its investments in stocks of financial institutions, management evaluates the near-term prospects of the issuers in relation to the severity and duration of the impairment. Based on that evaluation and the Corporation’s ability and intent to hold those investments for a reasonable period of time sufficient for a recovery of fair value, the Corporation does not consider those investments with unrealized holding losses as of June 30, 2015 to be other-than-temporarily impaired. The majority of the Corporation's available for sale corporate debt securities are issued by financial institutions. The following table presents the amortized cost and estimated fair value of corporate debt securities:
| June 30, 2015 |  | December 31, 2014
| Amortized cost |  | Estimated fair value |  | Amortized cost |  | Estimated fair value
| (in thousands)
Single-issuer trust preferred securities | $ | 47,613 |  |  | $ | 43,378 |  |  | $ | 47,569 |  |  | $ | 42,016 |
Subordinated debt | 47,595 |  |  | 49,716 |  |  | 47,530 |  |  | 50,023 |
Pooled trust preferred securities | — |  |  | 530 |  |  | 2,010 |  |  | 4,088 |
Corporate debt securities issued by financial institutions | 95,208 |  |  | 93,624 |  |  | 97,109 |  |  | 96,127 |
Other corporate debt securities | 3,548 |  |  | 3,548 |  |  | 1,907 |  |  | 1,907 |
Available for sale corporate debt securities | $ | 98,756 |  |  | $ | 97,172 |  |  | $ | 99,016 |  |  | $ | 98,034 |
The Corporation’s investments in single-issuer trust preferred securities had an unrealized loss of $4.2 million at June 30, 2015. The Corporation did not record any other-than-temporary impairment charges for single-issuer trust preferred securities during the three or six months ended June 30, 2015 or 2014. Seven of the Corporation's 19 single-issuer trust preferred securities were rated below investment grade by at least one ratings agency, with an amortized cost of $14.5 million and an estimated fair value of $13.1 million at June 30, 2015. All of the single-issuer trust preferred securities rated below investment grade were rated "BB" or "Ba". Three single-issuer trust preferred securities with an amortized cost of $4.7 million and an estimated fair value of $3.8 million at June 30, 2015 were not rated by any ratings agency. During the six months ended June 30, 2015, the Corporation sold three pooled trust preferred securities with a total amortized cost of $1.9 million, for a gain of $2.3 million. As of June 30, 2015, both of the Corporation's remaining pooled trust preferred securities, with an amortized cost of $0 and an estimated fair value of $530,000, were rated below investment grade by at least one ratings agency, with ratings ranging from "C" to "Ca". The class of securities held by the Corporation was below the most senior tranche, with the Corporation’s interests being subordinate to other investors in the pool. The Corporation determines the fair value of pooled trust preferred securities based on quotes provided by third-party brokers. The amortized cost of pooled trust preferred securities is the purchase price of the securities, net of cumulative credit related other-than-temporary impairment charges, determined using an expected cash flows model. The most significant input to the expected cash flows model is the expected payment deferral rate for each pooled trust preferred security. The Corporation evaluates the financial metrics, such as capital ratios and non-performing assets ratios, of the individual financial institution issuers that comprise each pooled trust preferred security to estimate its expected deferral rate. Based on management’s evaluations, corporate debt securities with a fair value of $97.2 million were not subject to any other-than-temporary impairment charges as of June 30, 2015. The Corporation does not have the intent to sell and does not believe it will more likely than not be required to sell any of these securities prior to a recovery of their fair value to amortized cost, which may be at maturity.

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