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v3.20.1

Investment Securities - Summary of Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Held-to-Maturity |  |
Amortized Cost | $ 54,377 | $ 40,927
Allowance for credit losses on HTM | (409) | 0
Net Carrying Amount | 53,968 | 40,927
Gross Unrealized Gains | 1,759 | 987
Gross Unrealized (Losses) | (13) | (59)
Estimated Fair Value | 55,714 | 41,855
Available-for-sale |  |
Amortized Cost | 2,418,498 | 3,263,151
Allowance for credit losses on AFS | (269) | 0
Gross Unrealized Gains | 53,884 | 31,740
Gross Unrealized (Losses) | (5,473) | (6,548)
Estimated Fair Value | 2,466,640 | 3,288,343
U.S. Treasury |  |
Available-for-sale |  |
Amortized Cost | 425,032 | 449,729
Allowance for credit losses on AFS | 0 | 0
Gross Unrealized Gains | 0 | 112
Gross Unrealized (Losses) | (43) | (112)
Estimated Fair Value | 424,989 | 449,729
U.S. Government agencies |  |
Available-for-sale |  |
Amortized Cost | 161,473 | 194,207
Allowance for credit losses on AFS | 0 | 0
Gross Unrealized Gains | 707 | 1,313
Gross Unrealized (Losses) | (891) | (1,271)
Estimated Fair Value | 161,289 | 194,249
Mortgage-backed securities |  |
Held-to-Maturity |  |
Amortized Cost | 27,121 | 10,796
Allowance for credit losses on HTM | 0 | 0
Net Carrying Amount | 27,121 | 10,796
Gross Unrealized Gains | 668 | 71
Gross Unrealized (Losses) | (1) | (59)
Estimated Fair Value | 27,788 | 10,808
Available-for-sale |  |
Amortized Cost | 1,150,878 | 1,738,584
Allowance for credit losses on AFS | 0 | 0
Gross Unrealized Gains | 32,068 | 8,510
Gross Unrealized (Losses) | (3,109) | (4,149)
Estimated Fair Value | 1,179,837 | 1,742,945
State and political subdivisions |  |
Held-to-Maturity |  |
Amortized Cost | 26,082 | 27,082
Allowance for credit losses on HTM | (97) | 0
Net Carrying Amount | 25,985 | 27,082
Gross Unrealized Gains | 981 | 849
Gross Unrealized (Losses) | (12) | 0
Estimated Fair Value | 26,954 | 27,931
Available-for-sale |  |
Amortized Cost | 659,350 | 860,539
Allowance for credit losses on AFS | (95) | 0
Gross Unrealized Gains | 20,243 | 20,983
Gross Unrealized (Losses) | (1,255) | (998)
Estimated Fair Value | 678,243 | 880,524
Other securities |  |
Held-to-Maturity |  |
Amortized Cost | 1,174 | 3,049
Allowance for credit losses on HTM | (312) | 0
Net Carrying Amount | 862 | 3,049
Gross Unrealized Gains | 110 | 67
Gross Unrealized (Losses) | 0 | 0
Estimated Fair Value | 972 | 3,116
Available-for-sale |  |
Amortized Cost | 21,765 | 20,092
Allowance for credit losses on AFS | (174) | 0
Gross Unrealized Gains | 866 | 822
Gross Unrealized (Losses) | (175) | (18)
Estimated Fair Value | $ 22,282 | $ 20,896

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