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Debt Securities - General Disclosures (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Debt securities available for sale |  |  |  |  |
Amortized Cost | $ 2,976,591 |  | $ 2,976,591 |  | $ 4,013,523
Gross Unrealized Gains | 608 |  | 608 |  | 22,382
Gross Unrealized Losses | (232,553) |  | (232,553) |  | (54,654)
Fair Value | 2,744,646 |  | 2,744,646 |  | 3,981,251
Debt securities held to maturity |  |  |  |  |
Amortized Cost | 953,012 |  | 953,012 |  |
Gross Unrealized Losses | (76,274) |  | (76,274) |  |
Fair Value | 876,738 |  | 876,738 |  |
Debt securities available for sale, Amortized Cost |  |  |  |  |
Due in one year or less | 191,190 |  | 191,190 |  |
Due after one year through five years | 421,603 |  | 421,603 |  |
Due after five years through ten years | 326,834 |  | 326,834 |  |
Due after ten years | 2,036,964 |  | 2,036,964 |  |
Amortized Cost | 2,976,591 |  | 2,976,591 |  | 4,013,523
Debt securities available for sale, Fair Value |  |  |  |  |
Due in one year or less | 189,295 |  | 189,295 |  |
Due after one year through five years | 399,194 |  | 399,194 |  |
Due after five years through ten years | 307,336 |  | 307,336 |  |
Due after ten years | 1,848,821 |  | 1,848,821 |  |
Fair Value | 2,744,646 |  | 2,744,646 |  | 3,981,251
Debt securities held to maturity, Amortized Cost |  |  |  |  |
Due after one year through five years | 48,232 |  | 48,232 |  |
Due after five years through ten years | 66,107 |  | 66,107 |  |
Due after ten years | 838,673 |  | 838,673 |  |
Amortised cost | 953,012 |  | 953,012 |  |
Debt securities held to maturity, Fair Value |  |  |  |  |
Due after one year through five years | 46,533 |  | 46,533 |  |
Due after five years through ten years | 61,995 |  | 61,995 |  |
Due after ten years | 768,210 |  | 768,210 |  |
Fair value | 876,738 |  | 876,738 |  |
Realized gains and losses on debt securities |  |  |  |  |
Gross gains on debt securities | 1 | $ 499 | 114 | $ 524 |
Gross (losses) on debt securities | (5) | (405) | (12) | (405) |
Realized net gains (losses) on debt securities | (4) | $ 94 | 102 | $ 119 |
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 2,001,930 |  | 2,001,930 |  | 2,676,734
Continuous unrealized losses existing for greater than 12 months, gross | 627,993 |  | 627,993 |  | 106,443
Total, gross | 2,629,923 |  | 2,629,923 |  | 2,783,177
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (157,307) |  | (157,307) |  | (49,847)
Continuous unrealized losses existing greater than 12 months, gross | (75,246) |  | (75,246) |  | (4,807)
Total, gross | (232,553) |  | (232,553) |  | (54,654)
Debt securities held to maturity, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 623,957 |  | 623,957 |  |
Continuous unrealized losses existing for greater than 12 months, gross | 252,780 |  | 252,780 |  |
Total, gross | 876,737 |  | 876,737 |  |
Debt securities held to maturity, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (53,749) |  | (53,749) |  |
Continuous unrealized losses existing for greater than 12 months, gross | (22,525) |  | (22,525) |  |
Total, gross | (76,274) |  | (76,274) |  |
U.S. Treasury securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 151,222 |  | 151,222 |  | 166,768
Gross Unrealized Gains | 1 |  | 1 |  | 41
Gross Unrealized Losses | (4,083) |  | (4,083) |  | (1,047)
Fair Value | 147,140 |  | 147,140 |  | 165,762
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 151,222 |  | 151,222 |  | 166,768
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 147,140 |  | 147,140 |  | 165,762
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 21,976 |  | 21,976 |  | 163,653
Continuous unrealized losses existing for greater than 12 months, gross | 124,094 |  | 124,094 |  |
Total, gross | 146,070 |  | 146,070 |  | 163,653
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (154) |  | (154) |  | (1,047)
Continuous unrealized losses existing greater than 12 months, gross | (3,929) |  | (3,929) |  |
Total, gross | (4,083) |  | (4,083) |  | (1,047)
Obligations of U.S. government corporations and agencies |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 29,867 |  | 29,867 |  | 37,579
Gross Unrealized Gains | 53 |  | 53 |  | 891
Gross Unrealized Losses | (81) |  | (81) |  |
Fair Value | 29,839 |  | 29,839 |  | 38,470
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 29,867 |  | 29,867 |  | 37,579
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 29,839 |  | 29,839 |  | 38,470
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 17,078 |  | 17,078 |  |
Total, gross | 17,078 |  | 17,078 |  |
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (81) |  | (81) |  |
Total, gross | (81) |  | (81) |  |
Obligations of states and political subdivisions |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 305,545 |  | 305,545 |  | 300,602
Gross Unrealized Gains | 455 |  | 455 |  | 7,760
Gross Unrealized Losses | (18,388) |  | (18,388) |  | (1,493)
Fair Value | 287,612 |  | 287,612 |  | 306,869
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 305,545 |  | 305,545 |  | 300,602
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 287,612 |  | 287,612 |  | 306,869
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 192,737 |  | 192,737 |  | 92,680
Continuous unrealized losses existing for greater than 12 months, gross | 11,056 |  | 11,056 |  |
Total, gross | 203,793 |  | 203,793 |  | 92,680
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (16,868) |  | (16,868) |  | (1,493)
Continuous unrealized losses existing greater than 12 months, gross | (1,520) |  | (1,520) |  |
Total, gross | (18,388) |  | (18,388) |  | (1,493)
Commercial mortgage-backed securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 105,584 |  | 105,584 |  | 625,339
Gross Unrealized Gains |  |  |  |  | 3,425
Gross Unrealized Losses | (7,222) |  | (7,222) |  | (13,766)
Fair Value | 98,362 |  | 98,362 |  | 614,998
Debt securities held to maturity |  |  |  |  |
Amortized Cost | 492,924 |  | 492,924 |  |
Gross Unrealized Losses | (38,687) |  | (38,687) |  |
Fair Value | 454,237 |  | 454,237 |  |
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 105,584 |  | 105,584 |  | 625,339
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 98,362 |  | 98,362 |  | 614,998
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 91,564 |  | 91,564 |  | 389,078
Continuous unrealized losses existing for greater than 12 months, gross | 6,798 |  | 6,798 |  | 85,905
Total, gross | 98,362 |  | 98,362 |  | 474,983
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (6,560) |  | (6,560) |  | (10,186)
Continuous unrealized losses existing greater than 12 months, gross | (662) |  | (662) |  | (3,580)
Total, gross | (7,222) |  | (7,222) |  | (13,766)
Debt securities held to maturity, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 241,060 |  | 241,060 |  |
Continuous unrealized losses existing for greater than 12 months, gross | 213,177 |  | 213,177 |  |
Total, gross | 454,237 |  | 454,237 |  |
Debt securities held to maturity, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (19,840) |  | (19,840) |  |
Continuous unrealized losses existing for greater than 12 months, gross | (18,847) |  | (18,847) |  |
Total, gross | (38,687) |  | (38,687) |  |
Residential mortgage-backed securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 1,599,774 |  | 1,599,774 |  | 2,095,104
Gross Unrealized Gains | 50 |  | 50 |  | 8,889
Gross Unrealized Losses | (158,667) |  | (158,667) |  | (34,680)
Fair Value | 1,441,157 |  | 1,441,157 |  | 2,069,313
Debt securities held to maturity |  |  |  |  |
Amortized Cost | 460,088 |  | 460,088 |  |
Gross Unrealized Losses | (37,587) |  | (37,587) |  |
Fair Value | 422,501 |  | 422,501 |  |
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 1,599,774 |  | 1,599,774 |  | 2,095,104
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 1,441,157 |  | 1,441,157 |  | 2,069,313
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 1,035,112 |  | 1,035,112 |  | 1,700,187
Continuous unrealized losses existing for greater than 12 months, gross | 399,554 |  | 399,554 |  | 20,538
Total, gross | 1,434,666 |  | 1,434,666 |  | 1,720,725
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (96,222) |  | (96,222) |  | (33,453)
Continuous unrealized losses existing greater than 12 months, gross | (62,445) |  | (62,445) |  | (1,227)
Total, gross | (158,667) |  | (158,667) |  | (34,680)
Debt securities held to maturity, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 382,897 |  | 382,897 |  |
Continuous unrealized losses existing for greater than 12 months, gross | 39,603 |  | 39,603 |  |
Total, gross | 422,500 |  | 422,500 |  |
Debt securities held to maturity, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (33,909) |  | (33,909) |  |
Continuous unrealized losses existing for greater than 12 months, gross | (3,678) |  | (3,678) |  |
Total, gross | (37,587) |  | (37,587) |  |
Asset-backed securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 490,932 |  | 490,932 |  | 492,055
Gross Unrealized Gains |  |  |  |  | 295
Gross Unrealized Losses | (22,803) |  | (22,803) |  | (164)
Fair Value | 468,129 |  | 468,129 |  | 492,186
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 490,932 |  | 490,932 |  | 492,055
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 468,129 |  | 468,129 |  | 492,186
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 465,293 |  | 465,293 |  | 89,983
Continuous unrealized losses existing for greater than 12 months, gross | 2,835 |  | 2,835 |  |
Total, gross | 468,128 |  | 468,128 |  | 89,983
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (22,632) |  | (22,632) |  | (164)
Continuous unrealized losses existing greater than 12 months, gross | (171) |  | (171) |  |
Total, gross | (22,803) |  | (22,803) |  | (164)
Corporate debt securities |  |  |  |  |
Debt securities available for sale |  |  |  |  |
Amortized Cost | 293,667 |  | 293,667 |  | 296,076
Gross Unrealized Gains | 49 |  | 49 |  | 1,081
Gross Unrealized Losses | (21,309) |  | (21,309) |  | (3,504)
Fair Value | 272,407 |  | 272,407 |  | 293,653
Debt securities available for sale, Amortized Cost |  |  |  |  |
Amortized Cost | 293,667 |  | 293,667 |  | 296,076
Debt securities available for sale, Fair Value |  |  |  |  |
Fair Value | 272,407 |  | 272,407 |  | 293,653
Debt securities available for sale, Fair Value |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | 178,170 |  | 178,170 |  | 241,153
Continuous unrealized losses existing for greater than 12 months, gross | 83,656 |  | 83,656 |  |
Total, gross | 261,826 |  | 261,826 |  | 241,153
Debt securities available for sale, Unrealized Losses |  |  |  |  |
Continuous unrealized losses existing for less than 12 months, gross | (14,790) |  | (14,790) |  | (3,504)
Continuous unrealized losses existing greater than 12 months, gross | (6,519) |  | (6,519) |  |
Total, gross | $ (21,309) |  | $ (21,309) |  | $ (3,504)

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