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Investment Securities - Amortized Cost and Approximate Fair Value of Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Available for sale securities |  |
Amortized Cost | $ 2,343,573 | $ 1,807,389
Gross Unrealized Gains | 81,181 | 112,079
Gross Unrealized Losses | 19,186 | 349
Fair Value | 2,405,568 | 1,919,119
Held to maturity securities |  |
Amortized Cost | 1,295,534 | 1,227,668
Allowance for Credit Losses | 245 | 0
Net Carrying Amount | 1,295,289 | 1,227,668
Gross Unrealized Gains | 35,004 | 52,877
Gross Unrealized Losses | 11,758 | 252
Fair Value | 1,318,780 | 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 | 11,504 | 2,380
Gross Unrealized Gains | 40 | 50
Gross Unrealized Losses | 163 | 0
Fair Value | 11,381 | 2,430
Held to maturity securities |  |
Amortized Cost | 60,676 | 31,087
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 60,676 | 31,087
Gross Unrealized Gains | 1 | 10
Gross Unrealized Losses | 1,553 | 113
Fair Value | 59,124 | 30,984
State and municipal |  |
Available for sale securities |  |
Amortized Cost | 1,301,378 | 1,168,711
Gross Unrealized Gains | 67,438 | 89,420
Gross Unrealized Losses | 2,654 | 246
Fair Value | 1,366,162 | 1,257,885
Held to maturity securities |  |
Amortized Cost | 624,553 | 619,927
Allowance for Credit Losses | 245 | 0
Net Carrying Amount | 624,308 | 619,927
Gross Unrealized Gains | 23,154 | 34,978
Gross Unrealized Losses | 3,389 | 32
Fair Value | 644,318 | 654,873
U.S. Government-sponsored mortgage-backed securities |  |
Available for sale securities |  |
Amortized Cost | 1,025,660 | 632,267
Gross Unrealized Gains | 13,550 | 22,505
Gross Unrealized Losses | 16,347 | 103
Fair Value | 1,022,863 | 654,669
Held to maturity securities |  |
Amortized Cost | 608,805 | 575,154
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 608,805 | 575,154
Gross Unrealized Gains | 11,849 | 17,889
Gross Unrealized Losses | 6,816 | 107
Fair Value | 613,838 | 592,936
Corporate obligations |  |
Available for sale securities |  |
Amortized Cost | 4,031 | 4,031
Gross Unrealized Gains | 153 | 104
Gross Unrealized Losses | 22 | 0
Fair Value | 4,162 | 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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