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Securities - Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Amortized cost and fair value of securities available for sale |  |
Amortized Cost | $ 2,754,317 | $ 2,400,956
Gross Unrealized Gains | 1,123 | 16,120
Gross Unrealized Losses | (227,187) | (31,024)
Fair Value | 2,528,253 | 2,386,052
Obligations of other U.S. Government agencies and corporations |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 145,000 |
Gross Unrealized Gains | 125 |
Gross Unrealized Losses | (643) |
Fair Value | 144,482 |
U.S. Treasury securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost |  | 3,007
Gross Unrealized Gains |  | 3
Gross Unrealized Losses |  | 0
Fair Value |  | 3,010
Obligations of states and political subdivisions |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 158,609 | 153,847
Gross Unrealized Gains | 533 | 5,532
Gross Unrealized Losses | (9,390) | (269)
Fair Value | 149,752 | 159,110
Other debt securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 123,068 | 36,515
Gross Unrealized Gains | 60 | 1,097
Gross Unrealized Losses | (4,198) | (148)
Fair Value | 118,930 | 37,464
Government agency mortgage backed securities | Residential mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 993,319 | 967,497
Gross Unrealized Gains | 334 | 7,854
Gross Unrealized Losses | (74,237) | (6,816)
Fair Value | 919,416 | 968,535
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 11,241 | 14,717
Gross Unrealized Gains | 0 | 365
Gross Unrealized Losses | (568) | (1)
Fair Value | 10,673 | 15,081
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 1,099,846 | 1,008,514
Gross Unrealized Gains | 3 | 457
Gross Unrealized Losses | (119,929) | (20,371)
Fair Value | 979,920 | 988,600
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 223,234 | 216,859
Gross Unrealized Gains | 68 | 812
Gross Unrealized Losses | (18,222) | (3,419)
Fair Value | $ 205,080 | $ 214,252

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