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Securities - Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | $ 2,554,976 | $ 2,400,956
Gross Unrealized Gains | 2,843 | 16,120
Gross Unrealized Losses | (152,503) | (31,024)
Fair Value | 2,405,316 | 2,386,052
U.S. Treasury securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 2,000 | 3,007
Gross Unrealized Gains | 0 | 3
Gross Unrealized Losses | 0 | 0
Fair Value | 2,000 | 3,010
Obligations of other U.S. Government agencies and corporations |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost |  | 153,847
Gross Unrealized Gains |  | 5,532
Gross Unrealized Losses |  | (269)
Fair Value |  | 159,110
Obligations of states and political subdivisions |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 161,565 | 0
Gross Unrealized Gains | 1,117 | 0
Gross Unrealized Losses | (5,205) | 0
Fair Value | 157,477 | 0
Trust preferred securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost |  | 0
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Fair Value |  | 0
Other debt securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 94,996 | 36,515
Gross Unrealized Gains | 385 | 1,097
Gross Unrealized Losses | (1,991) | (148)
Fair Value | 93,390 | 37,464
Government agency mortgage backed securities | Residential mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 969,140 | 967,497
Gross Unrealized Gains | 1,249 | 7,854
Gross Unrealized Losses | (48,493) | (6,816)
Fair Value | 921,896 | 968,535
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 11,277 | 14,717
Gross Unrealized Gains | 0 | 365
Gross Unrealized Losses | (371) | (1)
Fair Value | 10,906 | 15,081
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 1,094,043 | 1,008,514
Gross Unrealized Gains | 5 | 457
Gross Unrealized Losses | (83,591) | (20,371)
Fair Value | 1,010,457 | 988,600
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 221,955 | 216,859
Gross Unrealized Gains | 87 | 812
Gross Unrealized Losses | (12,852) | (3,419)
Fair Value | $ 209,190 | $ 214,252

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