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Securities - Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | $ 2,138,772 | $ 1,301,973
Gross Unrealized Gains | 32,940 | 44,699
Gross Unrealized Losses | (7,892) | (3,215)
Fair Value | 2,163,820 | 1,343,457
U.S. Treasury securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 3,021 | 7,047
Gross Unrealized Gains | 16 | 32
Gross Unrealized Losses | 0 | 0
Fair Value | 3,037 | 7,079
Obligations of other U.S. Government agencies and corporations |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost |  | 1,003
Gross Unrealized Gains |  | 6
Gross Unrealized Losses |  | 0
Fair Value |  | 1,009
Obligations of states and political subdivisions |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 314,675 | 291,231
Gross Unrealized Gains | 11,270 | 14,015
Gross Unrealized Losses | (425) | (45)
Fair Value | 325,520 | 305,201
Trust preferred securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost |  | 12,013
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (3,001)
Fair Value |  | 9,012
Other debt securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 59,523 | 62,771
Gross Unrealized Gains | 3,193 | 2,909
Gross Unrealized Losses | 0 | (73)
Fair Value | 62,716 | 65,607
Government agency mortgage backed securities | Residential mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 742,392 | 581,105
Gross Unrealized Gains | 13,670 | 21,564
Gross Unrealized Losses | (1,572) | (23)
Fair Value | 754,490 | 602,646
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 21,461 | 29,053
Gross Unrealized Gains | 795 | 1,235
Gross Unrealized Losses | 0 | (1)
Fair Value | 22,256 | 30,287
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 800,299 | 218,373
Gross Unrealized Gains | 2,267 | 1,946
Gross Unrealized Losses | (4,324) | (51)
Fair Value | 798,242 | 220,268
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 197,401 | 99,377
Gross Unrealized Gains | 1,729 | 2,992
Gross Unrealized Losses | (1,571) | (21)
Fair Value | $ 197,559 | $ 102,348

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