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Securities - General Disclosures (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 USD ($) security shares | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) security shares | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) security shares
Debt securities available for sale |  |  |  |  |
Amortized Cost | $ 3,997,424 |  | $ 3,997,424 |  | $ 2,211,543
Gross Unrealized Gains | 30,976 |  | 30,976 |  | 50,317
Gross Unrealized Losses | (31,156) |  | (31,156) |  | (673)
Fair Value | 3,997,244 |  | 3,997,244 |  | 2,261,187
Debt securities available for sale, Amortized Cost |  |  |  |  |
Due in one year or less | 103,158 |  | 103,158 |  |
Due after one year through five years | 603,868 |  | 603,868 |  |
Due after five years through ten years | 385,479 |  | 385,479 |  |
Due after ten years | 2,904,919 |  | 2,904,919 |  |
Amortized Cost | 3,997,424 |  | 3,997,424 |  | 2,211,543
Debt securities available for sale, Fair Value |  |  |  |  |
Due in one year or less | 103,787 |  | 103,787 |  |
Due after one year through five years | 608,074 |  | 608,074 |  |
Due after five years through ten years | 393,540 |  | 393,540 |  |
Due after ten years | 2,891,843 |  | 2,891,843 |  |
Fair Value | 3,997,244 |  | 3,997,244 |  | 2,261,187
Realized gains and losses on sales of debt securities |  |  |  |  |
Gross security gains |  | $ 11 | 524 | $ 1,718 |
Gross security (losses) | (5) |  | (410) | (8) |
Net gains (losses) on sales of debt securities | (5) | $ 11 | 114 | $ 1,710 |
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 2,324,265 |  | 2,324,265 |  | 221,913
Continuous unrealized losses existing for greater than 12 months, gross | 8,631 |  | 8,631 |  | 5,096
Total, gross | 2,332,896 |  | 2,332,896 |  | 227,009
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (31,068) |  | (31,068) |  | (621)
Continuous unrealized losses existing greater than 12 months, gross | (88) |  | (88) |  | (52)
Total, gross | $ (31,156) |  | $ (31,156) |  | $ (673)
Debt security portfolio | shares | 1,274 |  | 1,274 |  | 1,114
Number of securities in unrealized loss position | security | 294 |  | 294 |  | 23
Securities in unrealized loss position as a percentage of aggregate carrying value of investments | 1.30% |  | 1.30% |  | 0.30%
Collateral |  |  |  |  |
Realized gains and losses on sales of debt securities |  |  |  |  |
Carrying amount of debt securities pledged as collateral for public deposits, securities sold under agreements to repurchase and for other purposes | $ 729,200 |  | $ 729,200 |  | $ 628,000
U.S. Treasury securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 185,636 |  | 185,636 |  | 27,481
Gross Unrealized Gains | 72 |  | 72 |  | 356
Gross Unrealized Losses | (255) |  | (255) |  |
Fair Value | 185,453 |  | 185,453 |  | 27,837
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 185,636 |  | 185,636 |  | 27,481
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 185,453 |  | 185,453 |  | 27,837
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 180,317 |  | 180,317 |  |
Total, gross | 180,317 |  | 180,317 |  |
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (255) |  | (255) |  |
Total, gross | (255) |  | (255) |  |
Obligations of U.S. government corporations and agencies |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 37,784 |  | 37,784 |  | 67,406
Gross Unrealized Gains | 1,213 |  | 1,213 |  | 2,162
Gross Unrealized Losses |  |  |  |  | (49)
Fair Value | 38,997 |  | 38,997 |  | 69,519
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 37,784 |  | 37,784 |  | 67,406
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 38,997 |  | 38,997 |  | 69,519
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for greater than 12 months, gross |  |  |  |  | 4,957
Total, gross |  |  |  |  | 4,957
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing greater than 12 months, gross |  |  |  |  | (49)
Total, gross |  |  |  |  | (49)
Obligations of states and political subdivisions |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 288,023 |  | 288,023 |  | 292,940
Gross Unrealized Gains | 8,743 |  | 8,743 |  | 11,779
Gross Unrealized Losses | (754) |  | (754) |  | (8)
Fair Value | 296,012 |  | 296,012 |  | 304,711
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 288,023 |  | 288,023 |  | 292,940
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 296,012 |  | 296,012 |  | 304,711
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 55,434 |  | 55,434 |  | 762
Total, gross | 55,434 |  | 55,434 |  | 762
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (754) |  | (754) |  | (8)
Total, gross | (754) |  | (754) |  | (8)
Commercial mortgage-backed securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 607,097 |  | 607,097 |  | 408,716
Gross Unrealized Gains | 5,278 |  | 5,278 |  | 10,212
Gross Unrealized Losses | (9,078) |  | (9,078) |  | (312)
Fair Value | 603,297 |  | 603,297 |  | 418,616
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 607,097 |  | 607,097 |  | 408,716
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 603,297 |  | 603,297 |  | 418,616
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 434,220 |  | 434,220 |  | 129,655
Continuous unrealized losses existing for greater than 12 months, gross | 3,063 |  | 3,063 |  |
Total, gross | 437,283 |  | 437,283 |  | 129,655
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (9,036) |  | (9,036) |  | (312)
Continuous unrealized losses existing greater than 12 months, gross | (42) |  | (42) |  |
Total, gross | (9,078) |  | (9,078) |  | (312)
Residential mortgage-backed securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 2,108,388 |  | 2,108,388 |  | 1,344,047
Gross Unrealized Gains | 13,973 |  | 13,973 |  | 24,571
Gross Unrealized Losses | (19,753) |  | (19,753) |  | (303)
Fair Value | 2,102,608 |  | 2,102,608 |  | 1,368,315
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 2,108,388 |  | 2,108,388 |  | 1,344,047
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 2,102,608 |  | 2,102,608 |  | 1,368,315
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 1,392,160 |  | 1,392,160 |  | 89,997
Continuous unrealized losses existing for greater than 12 months, gross | 5,568 |  | 5,568 |  | 139
Total, gross | 1,397,728 |  | 1,397,728 |  | 90,136
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (19,707) |  | (19,707) |  | (300)
Continuous unrealized losses existing greater than 12 months, gross | (46) |  | (46) |  | (3)
Total, gross | (19,753) |  | (19,753) |  | (303)
Asset-backed securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 468,618 |  | 468,618 |  |
Gross Unrealized Gains | 323 |  | 323 |  |
Gross Unrealized Losses | (134) |  | (134) |  |
Fair Value | 468,807 |  | 468,807 |  |
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 468,618 |  | 468,618 |  |
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 468,807 |  | 468,807 |  |
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 51,183 |  | 51,183 |  |
Total, gross | 51,183 |  | 51,183 |  |
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (134) |  | (134) |  |
Total, gross | (134) |  | (134) |  |
Corporate debt securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 301,878 |  | 301,878 |  | 70,953
Gross Unrealized Gains | 1,374 |  | 1,374 |  | 1,237
Gross Unrealized Losses | (1,182) |  | (1,182) |  | (1)
Fair Value | 302,070 |  | 302,070 |  | 72,189
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 301,878 |  | 301,878 |  | 70,953
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 302,070 |  | 302,070 |  | 72,189
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 210,951 |  | 210,951 |  | 1,499
Total, gross | 210,951 |  | 210,951 |  | 1,499
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (1,182) |  | (1,182) |  | (1)
Total, gross | $ (1,182) |  | $ (1,182) |  | $ (1)

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