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Investment Securities - Amortized Cost and Approximate Fair Values of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Available for sale securities |  |
Amortized Cost | $ 2,273,347 | $ 2,268,655
Gross Unrealized Gains | 439 | 89,536
Gross Unrealized Losses | 297,125 | 13,640
Fair Value | 1,976,661 | 2,344,551
Held to maturity securities |  |
Amortized Cost | 2,287,372 | 2,180,047
Allowance for Credit Losses | 245 | 245
Net Carrying Amount | 2,287,127 | 2,179,802
Gross Unrealized Gains | 647 | 37,776
Gross Unrealized Losses | 380,154 | 15,320
Fair Value | 1,907,865 | 2,202,503
U.S. Treasury |  |
Available for sale securities |  |
Amortized Cost | 2,501 | 1,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 42 | 1
Fair Value | 2,459 | 999
U.S. Government-sponsored agency securities |  |
Available for sale securities |  |
Amortized Cost | 119,154 | 96,244
Gross Unrealized Gains | 0 | 437
Gross Unrealized Losses | 17,192 | 1,545
Fair Value | 101,962 | 95,136
Held to maturity securities |  |
Amortized Cost | 392,246 | 371,457
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 392,246 | 371,457
Gross Unrealized Gains | 0 | 226
Gross Unrealized Losses | 69,147 | 7,268
Fair Value | 323,099 | 364,415
State and municipal |  |
Available for sale securities |  |
Amortized Cost | 1,530,048 | 1,495,696
Gross Unrealized Gains | 438 | 81,734
Gross Unrealized Losses | 178,726 | 898
Fair Value | 1,351,760 | 1,576,532
Held to maturity securities |  |
Amortized Cost | 1,117,552 | 1,057,301
Allowance for Credit Losses | 245 | 245
Net Carrying Amount | 1,117,307 | 1,057,056
Gross Unrealized Gains | 647 | 29,593
Gross Unrealized Losses | 197,064 | 2,170
Fair Value | 921,135 | 1,084,724
U.S. Government-sponsored mortgage-backed securities |  |
Available for sale securities |  |
Amortized Cost | 608,630 | 671,684
Gross Unrealized Gains | 1 | 7,109
Gross Unrealized Losses | 100,358 | 11,188
Fair Value | 508,273 | 667,605
Held to maturity securities |  |
Amortized Cost | 776,074 | 749,789
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 776,074 | 749,789
Gross Unrealized Gains | 0 | 7,957
Gross Unrealized Losses | 113,915 | 5,881
Fair Value | 662,159 | 751,865
Corporate obligations |  |
Available for sale securities |  |
Amortized Cost | 13,014 | 4,031
Gross Unrealized Gains | 0 | 256
Gross Unrealized Losses | 807 | 8
Fair Value | 12,207 | 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 | 28 | 1
Fair Value | $ 1,472 | $ 1,499

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