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Investment Securities - Unrealized Gross Losses and Fair Values of Securities in a Continuous Loss Position (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
Securities in the available-for-sale portfolio in a continuous loss position |  |
Number of individual securities in a continuous loss position | security | 318 | 50
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | $ (125,923) | $ (10,705)
12 Months or More Unrealized Losses | (31,373) | (25)
Total Unrealized Losses | (157,296) | (10,730)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 6,044,029 | 1,068,883
12 Months or More Fair Value | 497,202 | 6,190
Total Fair Value | $ 6,541,231 | 1,075,073
Credit losses |  | 0
Investment securities comprised of collateralized loan obligations rated AA or better and obligations issued by local state and political subdivisions rated AA or better | 2.00% |
U.S. Treasury and government agency debt securities |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | $ (3,355) | (61)
12 Months or More Unrealized Losses | (869) |
Total Unrealized Losses | (4,224) | (61)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 134,468 | 38,507
12 Months or More Fair Value | 16,642 |
Total Fair Value | 151,110 | 38,507
Residential - Government-sponsored enterprises |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (10,876) | (725)
12 Months or More Unrealized Losses | (1,543) |
Total Unrealized Losses | (12,419) | (725)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 1,230,104 | 64,987
12 Months or More Fair Value | 32,415 |
Total Fair Value | 1,262,519 | 64,987
Residential - Government agency |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (291) |
Total Unrealized Losses | (291) |
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 51,231 |
Total Fair Value | 51,231 |
Commercial - Government agency |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (5,239) | (119)
12 Months or More Unrealized Losses | (1,282) |
Total Unrealized Losses | (6,521) | (119)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 186,024 | 32,346
12 Months or More Fair Value | 26,063 |
Total Fair Value | 212,087 | 32,346
Commercial - Government-sponsored enterprises |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (22,179) | (7,983)
12 Months or More Unrealized Losses | (26,535) |
Total Unrealized Losses | (48,714) | (7,983)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 744,819 | 427,759
12 Months or More Fair Value | 397,123 |
Total Fair Value | 1,141,942 | 427,759
Government agency |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (31,432) | (994)
12 Months or More Unrealized Losses |  | (25)
Total Unrealized Losses | (31,432) | (1,019)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 1,441,848 | 209,124
12 Months or More Fair Value |  | 6,190
Total Fair Value | 1,441,848 | 215,314
Government-sponsored enterprises |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (52,551) | (823)
12 Months or More Unrealized Losses | (1,144) |
Total Unrealized Losses | (53,695) | (823)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 2,255,535 | 296,160
12 Months or More Fair Value | 24,959 |
Total Fair Value | $ 2,280,494 | $ 296,160

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