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Investment Securities - Amortized cost and fair value for available for sale securities (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Investment securities available for sale |  |  |
Amortized cost | $ 1,915,461,000 | $ 1,472,538,000 | $ 1,940,763,000
Gross Unrealized Gains | 58,641,000 | 5,602,000 | 19,823,000
Gross Unrealized Losses | (2,907,000) | (11,891,000) | (4,539,000)
Fair Value | 1,971,195,000 | 1,466,249,000 | 1,956,047,000
Net realized gain (loss) | 0 | (541,000) |
Government-sponsored entities debt |  |  |
Investment securities available for sale |  |  |
Amortized cost | 4,882,000 | 65,567,000 | 25,356,000
Gross Unrealized Gains | 39,000 | 441,000 | 585,000
Gross Unrealized Losses |  | (304,000) |
Fair Value | 4,921,000 | 65,704,000 | 25,941,000
State and municipal obligations |  |  |
Investment securities available for sale |  |  |
Amortized cost | 215,388,000 | 190,302,000 | 204,150,000
Gross Unrealized Gains | 6,631,000 | 3,170,000 | 5,029,000
Gross Unrealized Losses | (415,000) | (54,000) | (764,000)
Fair Value | 221,604,000 | 193,418,000 | 208,415,000
Mortgage-backed securities |  |  |
Investment securities available for sale |  |  |
Amortized cost | 1,695,191,000 | 1,216,669,000 | 1,711,257,000
Gross Unrealized Gains | 51,971,000 | 1,991,000 | 14,209,000
Gross Unrealized Losses | (2,492,000) | (11,533,000) | (3,775,000)
Fair Value | 1,744,670,000 | 1,207,127,000 | 1,721,691,000
Mortgage-backed securities issued by private label holdings |  |  |
Investment securities available for sale |  |  |
Fair Value | $ 0 | 0 | $ 0
VISA Class B Shares |  |  |
Investment securities available for sale |  |  |
Net realized gain (loss) |  | 3,500,000 |
Securities other than VISA Class B Share |  |  |
Investment securities available for sale |  |  |
Net realized gain (loss) |  | $ (3,000,000.0) |

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454 + Details
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