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Debt Securities - General Disclosures (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Debt securities available for sale |  |  |
Amortized Cost | $ 3,082,715 |  | $ 4,013,523
Gross Unrealized Gains | 2,669 |  | 22,382
Gross Unrealized Losses | (139,329) |  | (54,654)
Fair Value | 2,946,055 |  | 3,981,251
Debt securities held to maturity |  |  |
Amortized Cost | 976,081 |  |
Gross Unrealized Losses | (33,235) |  |
Fair Value | 942,846 |  |
Debt securities available for sale, Amortized Cost |  |  |
Due in one year or less | 174,918 |  |
Due after one year through five years | 456,926 |  |
Due after five years through ten years | 313,336 |  |
Due after ten years | 2,137,535 |  |
Amortized Cost | 3,082,715 |  | 4,013,523
Debt securities available for sale, Fair Value |  |  |
Due in one year or less | 174,182 |  |
Due after one year through five years | 441,159 |  |
Due after five years through ten years | 303,050 |  |
Due after ten years | 2,027,664 |  |
Fair Value | 2,946,055 |  | 3,981,251
Debt securities held to maturity, Amortized Cost |  |  |
Due after one year through five years | 48,405 |  |
Due after five years through ten years | 66,693 |  |
Due after ten years | 860,983 |  |
Amortised cost | 976,081 |  |
Debt securities held to maturity, Fair Value |  |  |
Due after one year through five years | 47,185 |  |
Due after five years through ten years | 64,572 |  |
Due after ten years | 831,089 |  |
Fair value | 942,846 |  |
Realized gains and losses on debt securities |  |  |
Gross security gains | 113 | $ 25 |
Gross security (losses) | (7) |  |
Realized net gains (losses) on debt securities | 106 | $ 25 |
Debt securities available for sale, Fair Value |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 2,143,296 |  | 2,676,734
Continuous unrealized losses existing for greater than 12 months, gross | 450,478 |  | 106,443
Total, gross | 2,593,774 |  | 2,783,177
Debt securities available for sale, Unrealized Losses |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (96,653) |  | (49,847)
Continuous unrealized losses existing greater than 12 months, gross | (42,676) |  | (4,807)
Total, gross | (139,329) |  | (54,654)
Debt securities held to maturity, Fair Value |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 693,912 |  |
Continuous unrealized losses existing for greater than 12 months, gross | 248,934 |  |
Total, gross | 942,846 |  |
Debt securities held to maturity, Unrealized Losses |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (25,269) |  |
Continuous unrealized losses existing for greater than 12 months, gross | (7,966) |  |
Total, gross | (33,235) |  |
U.S. Treasury securities |  |  |
Debt securities available for sale |  |  |
Amortized Cost | 160,990 |  | 166,768
Gross Unrealized Gains | 16 |  | 41
Gross Unrealized Losses | (3,498) |  | (1,047)
Fair Value | 157,508 |  | 165,762
Debt securities available for sale, Amortized Cost |  |  |
Amortized Cost | 160,990 |  | 166,768
Debt securities available for sale, Fair Value |  |  |
Fair Value | 157,508 |  | 165,762
Debt securities available for sale, Fair Value |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 155,422 |  | 163,653
Total, gross | 155,422 |  | 163,653
Debt securities available for sale, Unrealized Losses |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (3,498) |  | (1,047)
Total, gross | (3,498) |  | (1,047)
Obligations of U.S. government corporations and agencies |  |  |
Debt securities available for sale |  |  |
Amortized Cost | 34,069 |  | 37,579
Gross Unrealized Gains | 243 |  | 891
Gross Unrealized Losses | (11) |  |
Fair Value | 34,301 |  | 38,470
Debt securities available for sale, Amortized Cost |  |  |
Amortized Cost | 34,069 |  | 37,579
Debt securities available for sale, Fair Value |  |  |
Fair Value | 34,301 |  | 38,470
Debt securities available for sale, Fair Value |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 390 |  |
Total, gross | 390 |  |
Debt securities available for sale, Unrealized Losses |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (11) |  |
Total, gross | (11) |  |
Obligations of states and political subdivisions |  |  |
Debt securities available for sale |  |  |
Amortized Cost | 308,514 |  | 300,602
Gross Unrealized Gains | 1,378 |  | 7,760
Gross Unrealized Losses | (10,300) |  | (1,493)
Fair Value | 299,592 |  | 306,869
Debt securities available for sale, Amortized Cost |  |  |
Amortized Cost | 308,514 |  | 300,602
Debt securities available for sale, Fair Value |  |  |
Fair Value | 299,592 |  | 306,869
Debt securities available for sale, Fair Value |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 158,528 |  | 92,680
Continuous unrealized losses existing for greater than 12 months, gross | 9,847 |  |
Total, gross | 168,375 |  | 92,680
Debt securities available for sale, Unrealized Losses |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (9,277) |  | (1,493)
Continuous unrealized losses existing greater than 12 months, gross | (1,023) |  |
Total, gross | (10,300) |  | (1,493)
Commercial mortgage-backed securities |  |  |
Debt securities available for sale |  |  |
Amortized Cost | 111,535 |  | 625,339
Gross Unrealized Gains | 30 |  | 3,425
Gross Unrealized Losses | (4,063) |  | (13,766)
Fair Value | 107,502 |  | 614,998
Debt securities held to maturity |  |  |
Amortized Cost | 503,285 |  |
Gross Unrealized Losses | (15,521) |  |
Fair Value | 487,764 |  |
Debt securities available for sale, Amortized Cost |  |  |
Amortized Cost | 111,535 |  | 625,339
Debt securities available for sale, Fair Value |  |  |
Fair Value | 107,502 |  | 614,998
Debt securities available for sale, Fair Value |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 87,087 |  | 389,078
Continuous unrealized losses existing for greater than 12 months, gross | 7,203 |  | 85,905
Total, gross | 94,290 |  | 474,983
Debt securities available for sale, Unrealized Losses |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (3,558) |  | (10,186)
Continuous unrealized losses existing greater than 12 months, gross | (505) |  | (3,580)
Total, gross | (4,063) |  | (13,766)
Debt securities held to maturity, Fair Value |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 281,462 |  |
Continuous unrealized losses existing for greater than 12 months, gross | 206,302 |  |
Total, gross | 487,764 |  |
Debt securities held to maturity, Unrealized Losses |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (9,329) |  |
Continuous unrealized losses existing for greater than 12 months, gross | (6,192) |  |
Total, gross | (15,521) |  |
Residential mortgage-backed securities |  |  |
Debt securities available for sale |  |  |
Amortized Cost | 1,678,891 |  | 2,095,104
Gross Unrealized Gains | 629 |  | 8,889
Gross Unrealized Losses | (104,144) |  | (34,680)
Fair Value | 1,575,376 |  | 2,069,313
Debt securities held to maturity |  |  |
Amortized Cost | 472,796 |  |
Gross Unrealized Losses | (17,714) |  |
Fair Value | 455,082 |  |
Debt securities available for sale, Amortized Cost |  |  |
Amortized Cost | 1,678,891 |  | 2,095,104
Debt securities available for sale, Fair Value |  |  |
Fair Value | 1,575,376 |  | 2,069,313
Debt securities available for sale, Fair Value |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 1,054,313 |  | 1,700,187
Continuous unrealized losses existing for greater than 12 months, gross | 393,830 |  | 20,538
Total, gross | 1,448,143 |  | 1,720,725
Debt securities available for sale, Unrealized Losses |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (65,980) |  | (33,453)
Continuous unrealized losses existing greater than 12 months, gross | (38,164) |  | (1,227)
Total, gross | (104,144) |  | (34,680)
Debt securities held to maturity, Fair Value |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 412,450 |  |
Continuous unrealized losses existing for greater than 12 months, gross | 42,632 |  |
Total, gross | 455,082 |  |
Debt securities held to maturity, Unrealized Losses |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (15,940) |  |
Continuous unrealized losses existing for greater than 12 months, gross | (1,774) |  |
Total, gross | (17,714) |  |
Asset-backed securities |  |  |
Debt securities available for sale |  |  |
Amortized Cost | 491,269 |  | 492,055
Gross Unrealized Gains | 12 |  | 295
Gross Unrealized Losses | (2,677) |  | (164)
Fair Value | 488,604 |  | 492,186
Debt securities available for sale, Amortized Cost |  |  |
Amortized Cost | 491,269 |  | 492,055
Debt securities available for sale, Fair Value |  |  |
Fair Value | 488,604 |  | 492,186
Debt securities available for sale, Fair Value |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 470,964 |  | 89,983
Total, gross | 470,964 |  | 89,983
Debt securities available for sale, Unrealized Losses |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (2,677) |  | (164)
Total, gross | (2,677) |  | (164)
Corporate debt securities |  |  |
Debt securities available for sale |  |  |
Amortized Cost | 297,447 |  | 296,076
Gross Unrealized Gains | 361 |  | 1,081
Gross Unrealized Losses | (14,636) |  | (3,504)
Fair Value | 283,172 |  | 293,653
Debt securities available for sale, Amortized Cost |  |  |
Amortized Cost | 297,447 |  | 296,076
Debt securities available for sale, Fair Value |  |  |
Fair Value | 283,172 |  | 293,653
Debt securities available for sale, Fair Value |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 216,592 |  | 241,153
Continuous unrealized losses existing for greater than 12 months, gross | 39,598 |  |
Total, gross | 256,190 |  | 241,153
Debt securities available for sale, Unrealized Losses |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (11,652) |  | (3,504)
Continuous unrealized losses existing greater than 12 months, gross | (2,984) |  |
Total, gross | $ (14,636) |  | $ (3,504)

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