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Investment Securities - Amortized Cost and Approximate Fair Value of Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Available for sale securities |  |
Amortized Cost | $ 2,265,457 | $ 2,268,655
Gross Unrealized Gains | 18,278 | 89,536
Gross Unrealized Losses | 119,538 | 13,640
Fair Value | 2,164,197 | 2,344,551
Held to maturity securities |  |
Amortized Cost | 2,325,311 | 2,180,047
Allowance for Credit Losses | 245 | 245
Net Carrying Amount | 2,325,066 | 2,179,802
Gross Unrealized Gains | 6,697 | 37,776
Gross Unrealized Losses | 186,014 | 15,320
Fair Value | 2,145,994 | 2,202,503
U.S. Treasury |  |
Available for sale securities |  |
Amortized Cost | 1,964 | 1,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 5 | 1
Fair Value | 1,959 | 999
U.S. Government-sponsored agency securities |  |
Available for sale securities |  |
Amortized Cost | 85,494 | 96,244
Gross Unrealized Gains | 7 | 437
Gross Unrealized Losses | 6,403 | 1,545
Fair Value | 79,098 | 95,136
Held to maturity securities |  |
Amortized Cost | 400,126 | 371,457
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 400,126 | 371,457
Gross Unrealized Gains | 0 | 226
Gross Unrealized Losses | 29,998 | 7,268
Fair Value | 370,128 | 364,415
State and municipal |  |
Available for sale securities |  |
Amortized Cost | 1,543,969 | 1,495,696
Gross Unrealized Gains | 17,890 | 81,734
Gross Unrealized Losses | 65,326 | 898
Fair Value | 1,496,533 | 1,576,532
Held to maturity securities |  |
Amortized Cost | 1,082,257 | 1,057,301
Allowance for Credit Losses | 245 | 245
Net Carrying Amount | 1,082,012 | 1,057,056
Gross Unrealized Gains | 5,718 | 29,593
Gross Unrealized Losses | 105,731 | 2,170
Fair Value | 982,244 | 1,084,724
U.S. Government-sponsored mortgage-backed securities |  |
Available for sale securities |  |
Amortized Cost | 629,999 | 671,684
Gross Unrealized Gains | 305 | 7,109
Gross Unrealized Losses | 47,780 | 11,188
Fair Value | 582,524 | 667,605
Held to maturity securities |  |
Amortized Cost | 841,428 | 749,789
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 841,428 | 749,789
Gross Unrealized Gains | 979 | 7,957
Gross Unrealized Losses | 50,285 | 5,881
Fair Value | 792,122 | 751,865
Corporate obligations |  |
Available for sale securities |  |
Amortized Cost | 4,031 | 4,031
Gross Unrealized Gains | 76 | 256
Gross Unrealized Losses | 24 | 8
Fair Value | 4,083 | 4,279
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 | 1
Fair Value | $ 1,500 | $ 1,499

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