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Investment Securities - Unrealized Gross Losses and Fair Values of Securities in a Continuous Loss Position (Details) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2022 USD ($) security shares | Dec. 31, 2021 USD ($) security shares
Securities in the available-for-sale portfolio in a continuous loss position |  |
Number of individual securities in a continuous loss position | security | 296 | 318
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | $ (253,749,000) | $ (125,923,000)
12 Months or More Unrealized Losses | (47,301,000) | (31,373,000)
Total Unrealized Losses | (301,050,000) | (157,296,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 3,406,115,000 | 6,044,029,000
12 Months or More Fair Value | 399,384,000 | 497,202,000
Total Fair Value | 3,805,499,000 | 6,541,231,000
Allowance for credit losses, investment securities | $ 0 | $ 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 | 4.00% | 4.00%
Class B restricted shares | Visa |  |
Time in Continuous Loss, Fair Value |  |
Shares held | shares | 120,000 | 120,000
Cost basis | $ 0 | $ 0
U.S. Treasury and government agency debt securities |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (2,239,000) | (3,355,000)
12 Months or More Unrealized Losses | (6,725,000) | (869,000)
Total Unrealized Losses | (8,964,000) | (4,224,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 87,782,000 | 134,468,000
12 Months or More Fair Value | 71,383,000 | 16,642,000
Total Fair Value | 159,165,000 | 151,110,000
Government-sponsored enterprises debt securities |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (37,000) |
Total Unrealized Losses | (37,000) |
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 19,964,000 |
Total Fair Value | 19,964,000 |
Residential - Government-sponsored enterprises |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (110,301,000) | (10,876,000)
12 Months or More Unrealized Losses | (1,169,000) | (1,543,000)
Total Unrealized Losses | (111,470,000) | (12,419,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 1,303,823,000 | 1,230,104,000
12 Months or More Fair Value | 9,196,000 | 32,415,000
Total Fair Value | 1,313,019,000 | 1,262,519,000
Residential - Government agency |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (4,069,000) | (291,000)
Total Unrealized Losses | (4,069,000) | (291,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 67,958,000 | 51,231,000
Total Fair Value | 67,958,000 | 51,231,000
Commercial - Government agency |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (12,813,000) | (5,239,000)
12 Months or More Unrealized Losses | (16,801,000) | (1,282,000)
Total Unrealized Losses | (29,614,000) | (6,521,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 150,595,000 | 186,024,000
12 Months or More Fair Value | 116,854,000 | 26,063,000
Total Fair Value | 267,449,000 | 212,087,000
Commercial - Government-sponsored enterprises |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (4,482,000) | (22,179,000)
12 Months or More Unrealized Losses | (1,760,000) | (26,535,000)
Total Unrealized Losses | (6,242,000) | (48,714,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 77,564,000 | 744,819,000
12 Months or More Fair Value | 18,478,000 | 397,123,000
Total Fair Value | 96,042,000 | 1,141,942,000
Commercial - Non -agency |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (407,000) |
Total Unrealized Losses | (407,000) |
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 21,550,000 |
Total Fair Value | 21,550,000 |
Government agency |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (74,997,000) | (31,432,000)
12 Months or More Unrealized Losses | (1,941,000) |
Total Unrealized Losses | (76,938,000) | (31,432,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 988,818,000 | 1,441,848,000
12 Months or More Fair Value | 16,549,000 |
Total Fair Value | 1,005,367,000 | 1,441,848,000
Government-sponsored enterprises |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (41,157,000) | (52,551,000)
12 Months or More Unrealized Losses | (18,905,000) | (1,144,000)
Total Unrealized Losses | (60,062,000) | (53,695,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 517,636,000 | 2,255,535,000
12 Months or More Fair Value | 166,924,000 | 24,959,000
Total Fair Value | 684,560,000 | $ 2,280,494,000
Collateralized Loan Obligations |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (3,247,000) |
Total Unrealized Losses | (3,247,000) |
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 170,425,000 |
Total Fair Value | $ 170,425,000 |

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