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Investment Securities - Amortized Cost and Approximate Fair Value of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Available for sale securities |  |
Amortized Cost | $ 2,307,977 | $ 1,807,389
Gross Unrealized Gains | 82,762 | 112,079
Gross Unrealized Losses | 16,161 | 349
Fair Value | 2,374,578 | 1,919,119
Held to maturity securities |  |
Amortized Cost | 2,071,183 | 1,227,668
Allowance for Credit Losses | 245 | 0
Net Carrying Amount | 2,070,938 | 1,227,668
Gross Unrealized Gains | 34,769 | 52,877
Gross Unrealized Losses | 19,397 | 252
Fair Value | 2,086,555 | 1,280,293
U.S. Treasury |  |
Available for sale securities |  |
Amortized Cost | 1,000 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Fair Value | 1,000 |
U.S. Government-sponsored agency securities |  |
Available for sale securities |  |
Amortized Cost | 11,500 | 2,380
Gross Unrealized Gains | 57 | 50
Gross Unrealized Losses | 0 | 0
Fair Value | 11,557 | 2,430
Held to maturity securities |  |
Amortized Cost | 90,678 | 31,087
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 90,678 | 31,087
Gross Unrealized Gains | 86 | 10
Gross Unrealized Losses | 840 | 113
Fair Value | 89,924 | 30,984
State and municipal |  |
Available for sale securities |  |
Amortized Cost | 1,466,349 | 1,168,711
Gross Unrealized Gains | 72,152 | 89,420
Gross Unrealized Losses | 3,946 | 246
Fair Value | 1,534,555 | 1,257,885
Held to maturity securities |  |
Amortized Cost | 996,247 | 619,927
Allowance for Credit Losses | 245 | 0
Net Carrying Amount | 996,002 | 619,927
Gross Unrealized Gains | 24,330 | 34,978
Gross Unrealized Losses | 9,618 | 32
Fair Value | 1,010,959 | 654,873
U.S. Government-sponsored mortgage-backed securities |  |
Available for sale securities |  |
Amortized Cost | 825,097 | 632,267
Gross Unrealized Gains | 10,255 | 22,505
Gross Unrealized Losses | 12,215 | 103
Fair Value | 823,137 | 654,669
Held to maturity securities |  |
Amortized Cost | 982,758 | 575,154
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 982,758 | 575,154
Gross Unrealized Gains | 10,353 | 17,889
Gross Unrealized Losses | 8,939 | 107
Fair Value | 984,172 | 592,936
Corporate obligations |  |
Available for sale securities |  |
Amortized Cost | 4,031 | 4,031
Gross Unrealized Gains | 298 | 104
Gross Unrealized Losses | 0 | 0
Fair Value | 4,329 | 4,135
Foreign investment |  |
Held to maturity securities |  |
Amortized Cost | 1,500 | 1,500
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 1,500 | 1,500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | $ 1,500 | $ 1,500

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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=123581744&loc=d3e27161-111563 + Details
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