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v3.20.2

Investment Securities - Summary of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Held-to-Maturity |  |  |
Amortized Cost | $ 47,475 |  | $ 40,927
Allowance for credit losses on HTM | (373) | $ (307) | 0
Net Carrying Amount | 47,102 |  | 40,927
Gross Unrealized Gains | 1,964 |  | 987
Gross Unrealized (Losses) | (2) |  | (59)
Estimated Fair Value | 49,064 |  | 41,855
Available-for-sale |  |  |
Amortized Cost | 2,556,808 |  | 3,263,151
Allowance for credit losses on AFS | (1,208) | (609) | 0
Gross Unrealized Gains | 56,737 |  | 31,740
Gross Unrealized (Losses) | (5,049) |  | (6,548)
Estimated Fair Value | 2,607,288 |  | 3,288,343
U.S. Treasury |  |  |
Available-for-sale |  |  |
Amortized Cost |  |  | 449,729
Allowance for credit losses on AFS |  |  | 0
Gross Unrealized Gains |  |  | 112
Gross Unrealized (Losses) |  |  | (112)
Estimated Fair Value |  |  | 449,729
U.S. Government agencies |  |  |
Available-for-sale |  |  |
Amortized Cost | 472,078 |  | 194,207
Allowance for credit losses on AFS | 0 |  | 0
Gross Unrealized Gains | 1,257 |  | 1,313
Gross Unrealized (Losses) | (1,362) |  | (1,271)
Estimated Fair Value | 471,973 |  | 194,249
Mortgage-backed securities |  |  |
Held-to-Maturity |  |  |
Amortized Cost | 24,297 |  | 10,796
Allowance for credit losses on HTM | 0 |  | 0
Net Carrying Amount | 24,297 |  | 10,796
Gross Unrealized Gains | 701 |  | 71
Gross Unrealized (Losses) | (1) |  | (59)
Estimated Fair Value | 24,997 |  | 10,808
Available-for-sale |  |  |
Amortized Cost | 882,076 |  | 1,738,584
Allowance for credit losses on AFS | 0 |  | 0
Gross Unrealized Gains | 22,050 |  | 8,510
Gross Unrealized (Losses) | (439) |  | (4,149)
Estimated Fair Value | 903,687 |  | 1,742,945
State and political subdivisions |  |  |
Held-to-Maturity |  |  |
Amortized Cost | 22,003 |  | 27,082
Allowance for credit losses on HTM | (73) | (95) | 0
Net Carrying Amount | 21,930 |  | 27,082
Gross Unrealized Gains | 1,155 |  | 849
Gross Unrealized (Losses) | (1) |  | 0
Estimated Fair Value | 23,084 |  | 27,931
Available-for-sale |  |  |
Amortized Cost | 1,105,341 |  | 860,539
Allowance for credit losses on AFS | (1,148) | (371) | 0
Gross Unrealized Gains | 32,001 |  | 20,983
Gross Unrealized (Losses) | (3,188) |  | (998)
Estimated Fair Value | 1,133,006 |  | 880,524
Other securities |  |  |
Held-to-Maturity |  |  |
Amortized Cost | 1,175 |  | 3,049
Allowance for credit losses on HTM | (300) | (212) | 0
Net Carrying Amount | 875 |  | 3,049
Gross Unrealized Gains | 108 |  | 67
Gross Unrealized (Losses) |  |  | 0
Estimated Fair Value | 983 |  | 3,116
Available-for-sale |  |  |
Amortized Cost | 97,313 |  | 20,092
Allowance for credit losses on AFS | (60) | $ (238) | 0
Gross Unrealized Gains | 1,429 |  | 822
Gross Unrealized (Losses) | (60) |  | (18)
Estimated Fair Value | $ 98,622 |  | $ 20,896

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