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Investment Securities | 3 Months Ended
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Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract] |
Investment Securities | Investment Securities The following table presents the amortized cost and estimated fair values of investment securities:
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
March 31, 2020 | (in thousands)
Available for Sale |  |  |  |  |  |  |
State and municipal securities | $ | 825,863 |  |  | $ | 23,790 |  |  | $ | (1,569 | ) |  | $ | 848,084 |
Corporate debt securities | 375,141 |  |  | 5,378 |  |  | (7,041 | ) |  | 373,478 |
Collateralized mortgage obligations | 638,458 |  |  | 29,194 |  |  | — |  |  | 667,652 |
Residential mortgage-backed securities | 214,259 |  |  | 6,370 |  |  | — |  |  | 220,629 |
Commercial mortgage-backed securities | 574,860 |  |  | 12,681 |  |  | (216 | ) |  | 587,325 |
Auction rate securities | 107,410 |  |  | — |  |  | (13,744 | ) |  | 93,666 |
Total | $ | 2,735,991 |  |  | $ | 77,413 |  |  | $ | (22,570 | ) |  | $ | 2,790,834 |
Held to Maturity |  |  |  |  |  |  |
Residential mortgage-backed securities | $ | 350,606 |  |  | $ | 21,667 |  |  | $ | — |  |  | $ | 372,273 |
| Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
December 31, 2019 | (in thousands)
Available for Sale |  |  |  |  |  |  |
State and municipal securities | $ | 638,125 |  |  | $ | 15,826 |  |  | $ | (1,024 | ) |  | $ | 652,927 |
Corporate debt securities | 370,401 |  |  | 8,490 |  |  | (1,534 | ) |  | 377,357 |
Collateralized mortgage obligations | 682,307 |  |  | 11,726 |  |  | (315 | ) |  | 693,718 |
Residential mortgage-backed securities | 177,183 |  |  | 1,078 |  |  | (949 | ) |  | 177,312 |
Commercial mortgage-backed securities | 489,603 |  |  | 6,471 |  |  | (1,777 | ) |  | 494,297 |
Auction rate securities | 107,410 |  |  | — |  |  | (5,484 | ) |  | 101,926 |
Total | $ | 2,465,029 |  |  | $ | 43,591 |  |  | $ | (11,083 | ) |  | $ | 2,497,537 |
Held to Maturity |  |  |  |  |  |  |
Residential mortgage-backed securities | $ | 369,841 |  |  | $ | 13,864 |  |  | $ | — |  |  | $ | 383,705 |
Securities carried at $497.8 million at March 31, 2020 and $462.6 million at December 31, 2019, were pledged as collateral to secure public and trust deposits and customer repurchase agreements. The amortized cost and estimated fair values of debt securities as of March 31, 2020, by contractual maturity, are shown in the following table. Actual maturities may differ from contractual maturities as certain investment securities are subject to call or prepayment with or without call or prepayment penalties.
|  | Available for Sale |  | Held to Maturity
|  | Amortized Cost |  | Estimated Fair Value |  | Amortized Cost |  | Estimated Fair Value
| (in thousands)
Due in one year or less |  | $ | 1,175 |  |  | $ | 1,175 |  |  | $ | — |  |  | $ | — |
Due from one year to five years |  | 34,996 |  |  | 35,936 |  |  | — |  |  | — |
Due from five years to ten years |  | 355,584 |  |  | 355,472 |  |  | — |  |  | — |
Due after ten years |  | 916,659 |  |  | 922,645 |  |  | — |  |  | — |
|  | 1,308,414 |  |  | 1,315,228 |  |  | — |  |  | — |
Residential mortgage-backed securities(1) |  | 214,259 |  |  | 220,629 |  |  | 350,606 |  |  | 372,273 |
Commercial mortgage-backed securities(1) |  | 574,860 |  |  | 587,325 |  |  | — |  |  | — |
Collateralized mortgage obligations(1) |  | 638,458 |  |  | 667,652 |  |  | — |  |  | — |
Total |  | $ | 2,735,991 |  |  | $ | 2,790,834 |  |  | $ | 350,606 |  |  | $ | 372,273 |
(1) Mortgage-backed securities and collateralized mortgage obligations do not have stated maturities and are dependent upon the interest rate environment and prepayments on the underlying loans.
The following table presents information related to the gross realized gains and losses on the sales of debt securities for the three months ended:
| Gross Realized |  |
| Gains |  | Losses |  | Net Gains
Three months ended March 31, 2020 | (in thousands)
March 31, 2020 | $ | 117 |  |  | $ | (71 | ) |  | $ | 46 |
Three months ended March 31, 2019 |  |  |  |  |
March 31, 2019 | $ | 257 |  |  | $ | (192 | ) |  | $ | 65 |
The cumulative balance of credit-related OTTI charges previously recognized as components of earnings for debt securities held by the Corporation at March 31, 2019 were $11.5 million. There were no additional credit losses recognized for the three months ended March 31, 2020. The following tables present 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 as of the following periods:
| Less than 12 months |  | 12 months or longer |  | Total
| Number of Securities |  | Estimated Fair Value |  | Unrealized Losses |  | Number of Securities |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses
March 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for Sale |  |  | (in thousands)
State and municipal securities | 34 |  |  | $ | 124,083 |  |  | $ | (1,569 | ) |  | — |  |  | $ | — |  |  | $ | — |  |  | $ | 124,083 |  |  | $ | (1,569 | )
Corporate debt securities | 15 |  |  | 159,999 |  |  | (3,609 | ) |  | 8 |  |  | 16,527 |  |  | (3,432 | ) |  | 176,526 |  |  | (7,041 | )
Commercial mortgage-backed securities | 3 |  |  | 71,118 |  |  | (216 | ) |  | — |  |  | — |  |  | — |  |  | 71,118 |  |  | (216 | )
Auction rate securities | — |  |  | — |  |  | — |  |  | 177 |  |  | 93,666 |  |  | (13,744 | ) |  | 93,666 |  |  | (13,744 | )
Total available for sale(1) | 52 |  |  | $ | 355,200 |  |  | $ | (5,394 | ) |  | 185 |  |  | $ | 110,193 |  |  | $ | (17,176 | ) |  | $ | 465,393 |  |  | $ | (22,570 | )
| Less than 12 months |  | 12 months or longer |  | Total
| Number of Securities |  | Estimated Fair Value |  | Unrealized Losses |  | Number of Securities |  | Estimated Fair Value |  | Unrealized Losses |  | Estimated Fair Value |  | Unrealized Losses
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for Sale | (in thousands)
State and municipal securities | 44 |  |  | $ | 136,344 |  |  | $ | (1,024 | ) |  | — |  |  | $ | — |  |  | $ | — |  |  | $ | 136,344 |  |  | $ | (1,024 | )
Corporate debt securities | 5 |  |  | 30,719 |  |  | (346 | ) |  | 8 |  |  | 18,759 |  |  | (1,188 | ) |  | 49,478 |  |  | (1,534 | )
Collateralized mortgage obligations | 5 |  |  | 33,865 |  |  | (190 | ) |  | 1 |  |  | 5,330 |  |  | (125 | ) |  | 39,195 |  |  | (315 | )
Residential mortgage-backed securities | 5 |  |  | 12,247 |  |  | (40 | ) |  | 26 |  |  | 127,373 |  |  | (909 | ) |  | 139,620 |  |  | (949 | )
Commercial mortgage-backed securities | 7 |  |  | 121,340 |  |  | (1,777 | ) |  | — |  |  | — |  |  | — |  |  | 121,340 |  |  | (1,777 | )
Auction rate securities | — |  |  | — |  |  | — |  |  | 177 |  |  | 101,926 |  |  | (5,484 | ) |  | 101,926 |  |  | (5,484 | )
Total available for sale(1) | 66 |  |  | $ | 334,515 |  |  | $ | (3,377 | ) |  | 212 |  |  | $ | 253,388 |  |  | $ | (7,706 | ) |  | $ | 587,903 |  |  | $ | (11,083 | )
(1) No HTM securities were in an unrealized loss position as of March 31, 2020 and December 31, 2019. 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. The change in fair value of these securities is attributable to changes in interest rates and not credit quality, and 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. Therefore, the Corporation does not have an ACL for these investments as of March 31, 2020. Based on management’s evaluations, no ACL was required for ARCs or corporate debt securities as of March 31, 2020. 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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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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