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Investment Securities - Amortized Cost and Approximate Fair Values of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Available-for-Sale: |  |
Amortized Cost | $ 2,213,200 | $ 2,229,300
Gross Unrealized Gains | 1,500 | 3,900
Gross Unrealized Losses | (55,900) | (24,500)
Estimated Fair Value | 2,158,800 | 2,208,700
Held-to-Maturity: |  |
Amortized Cost | 417,800 | 484,500
Gross Unrealized Gains | 9,000 | 11,500
Gross Unrealized Losses | (19,400) | (12,700)
Estimated Fair Value | 407,400 | 483,300
U.S. Treasury notes |  |
Available-for-Sale: |  |
Amortized Cost | 3,000 | 3,200
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 3,000 | 3,200
Obligations of U.S. government agencies |  |
Available-for-Sale: |  |
Amortized Cost | 576,200 | 569,500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (15,300) | (8,000)
Estimated Fair Value | 560,900 | 561,500
Held-to-Maturity: |  |
Amortized Cost | 19,700 | 19,800
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (300) | (200)
Estimated Fair Value | 19,400 | 19,600
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations |  |
Available-for-Sale: |  |
Amortized Cost | 1,462,000 | 1,474,100
Gross Unrealized Gains | 1,400 | 3,800
Gross Unrealized Losses | (37,800) | (15,400)
Estimated Fair Value | 1,425,600 | 1,462,500
Held-to-Maturity: |  |
Amortized Cost | 198,000 | 230,500
Gross Unrealized Gains | 7,800 | 8,800
Gross Unrealized Losses | (16,800) | (11,600)
Estimated Fair Value | 189,000 | 227,700
Private mortgage-backed securities |  |
Available-for-Sale: |  |
Amortized Cost | 74,800 | 91,500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,800) | (800)
Estimated Fair Value | 73,000 | 90,700
State, county and municipal securities |  |
Held-to-Maturity: |  |
Amortized Cost | 153,700 | 172,400
Gross Unrealized Gains | 1,200 | 2,600
Gross Unrealized Losses | (1,700) | (600)
Estimated Fair Value | 153,200 | 174,400
Corporate securities |  |
Available-for-Sale: |  |
Amortized Cost | 93,000 | 88,000
Gross Unrealized Gains | 100 | 100
Gross Unrealized Losses | (1,000) | (300)
Estimated Fair Value | 92,100 | 87,800
Held-to-Maturity: |  |
Amortized Cost | 46,300 | 61,600
Gross Unrealized Gains | 0 | 100
Gross Unrealized Losses | (600) | (300)
Estimated Fair Value | 45,700 | 61,400
Other investments |  |
Available-for-Sale: |  |
Amortized Cost | 4,200 | 3,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 4,200 | 3,000
Other Investments |  |
Held-to-Maturity: |  |
Amortized Cost | 100 | 200
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 100 | $ 200

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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=82897076&loc=d3e27161-111563 + Details
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