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Investment Securities - Amortized Cost and Approximate Fair Value of Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Available for sale securities |  |
Amortized Cost | $ 2,542,432 | $ 2,268,655
Gross Unrealized Gains | 3,064 | 89,536
Gross Unrealized Losses | 249,145 | 13,640
Fair Value | 2,296,351 | 2,344,551
Held to maturity securities |  |
Amortized Cost | 2,333,924 | 2,180,047
Allowance for Credit Losses | 245 | 245
Net Carrying Amount | 2,333,679 | 2,179,802
Gross Unrealized Gains | 1,411 | 37,776
Gross Unrealized Losses | 309,811 | 15,320
Fair Value | 2,025,524 | 2,202,503
U.S. Treasury |  |
Available for sale securities |  |
Amortized Cost | 16,300 | 1,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 111 | 1
Fair Value | 16,189 | 999
U.S. Government-sponsored agency securities |  |
Available for sale securities |  |
Amortized Cost | 134,594 | 96,244
Gross Unrealized Gains | 204 | 437
Gross Unrealized Losses | 10,186 | 1,545
Fair Value | 124,612 | 95,136
Held to maturity securities |  |
Amortized Cost | 393,331 | 371,457
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 393,331 | 371,457
Gross Unrealized Gains | 0 | 226
Gross Unrealized Losses | 47,376 | 7,268
Fair Value | 345,955 | 364,415
State and municipal |  |
Available for sale securities |  |
Amortized Cost | 1,665,253 | 1,495,696
Gross Unrealized Gains | 2,687 | 81,734
Gross Unrealized Losses | 162,690 | 898
Fair Value | 1,505,250 | 1,576,532
Held to maturity securities |  |
Amortized Cost | 1,117,526 | 1,057,301
Allowance for Credit Losses | 245 | 245
Net Carrying Amount | 1,117,281 | 1,057,056
Gross Unrealized Gains | 1,368 | 29,593
Gross Unrealized Losses | 183,539 | 2,170
Fair Value | 935,355 | 1,084,724
U.S. Government-sponsored mortgage-backed securities |  |
Available for sale securities |  |
Amortized Cost | 712,216 | 671,684
Gross Unrealized Gains | 168 | 7,109
Gross Unrealized Losses | 75,925 | 11,188
Fair Value | 636,459 | 667,605
Held to maturity securities |  |
Amortized Cost | 821,567 | 749,789
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 821,567 | 749,789
Gross Unrealized Gains | 43 | 7,957
Gross Unrealized Losses | 78,881 | 5,881
Fair Value | 742,729 | 751,865
Corporate obligations |  |
Available for sale securities |  |
Amortized Cost | 14,069 | 4,031
Gross Unrealized Gains | 5 | 256
Gross Unrealized Losses | 233 | 8
Fair Value | 13,841 | 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 | 15 | 1
Fair Value | $ 1,485 | $ 1,499

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