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Investment Securities - Amortized cost and fair value for available for sale securities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Investment securities available for sale |  |  |
Amortized cost | $ 3,268,037 | $ 1,940,763 |
Gross Unrealized Gains | 66,800 | 19,823 |
Gross Unrealized Losses | (4,165) | (4,539) |
Fair Value | 3,330,672 | 1,956,047 |
Gross realized gains | 662 | 6,030 | $ 31
Gross realized losses | 612 | 3,319 | $ 686
investment securities held-to-maturity |  |  |
Investment Securities - Held to Maturity | 955,542 |  |
Gross Unrealized Gains | 2,764 |  |
Gross Unrealized Losses | (1,123) |  |
Fair Value | 957,183 | 0 |
Government-sponsored entities debt |  |  |
Investment securities available for sale |  |  |
Amortized cost | 29,882 | 25,356 |
Gross Unrealized Gains | 16 | 585 |
Gross Unrealized Losses | (642) |  |
Fair Value | 29,256 | 25,941 |
investment securities held-to-maturity |  |  |
Investment Securities - Held to Maturity | 25,000 |  |
Gross Unrealized Gains | 1 |  |
Fair Value | 25,001 |  |
State and municipal obligations |  |  |
Investment securities available for sale |  |  |
Amortized cost | 502,575 | 204,150 |
Gross Unrealized Gains | 17,491 | 5,029 |
Gross Unrealized Losses | (27) | (764) |
Fair Value | 520,039 | 208,415 |
Mortgage-backed securities |  |  |
Investment securities available for sale |  |  |
Amortized cost | 2,722,018 | 1,711,257 |
Gross Unrealized Gains | 49,153 | 14,209 |
Gross Unrealized Losses | (3,496) | (3,775) |
Fair Value | 2,767,675 | $ 1,721,691 |
investment securities held-to-maturity |  |  |
Investment Securities - Held to Maturity | 930,542 |  |
Gross Unrealized Gains | 2,763 |  |
Gross Unrealized Losses | (1,123) |  |
Fair Value | 932,182 |  |
Corporate securities. |  |  |
Investment securities available for sale |  |  |
Amortized cost | 13,562 |  |
Gross Unrealized Gains | 140 |  |
Fair Value | 13,702 |  |
Mortgage-backed securities issued by private label holdings |  |  |
Investment securities available for sale |  |  |
Fair Value | $ 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=121645371&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=121645371&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=121645371&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=121558606&loc=SL82898722-210454 + Details
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