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Investment Securities - Unrealized Gross Losses and Fair Values of Securities in a Continuous Loss Position (Details) | 9 Months Ended | 12 Months Ended
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Sep. 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 | 277 | 318
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | $ (271,719,000) | $ (125,923,000)
12 Months or More Unrealized Losses | (112,568,000) | (31,373,000)
Total Unrealized Losses | (384,287,000) | (157,296,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 2,549,732,000 | 6,044,029,000
12 Months or More Fair Value | 663,150,000 | 497,202,000
Total Fair Value | 3,212,882,000 | 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 | (3,200,000) | (3,355,000)
12 Months or More Unrealized Losses | (9,991,000) | (869,000)
Total Unrealized Losses | (13,191,000) | (4,224,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 83,558,000 | 134,468,000
12 Months or More Fair Value | 68,964,000 | 16,642,000
Total Fair Value | 152,522,000 | 151,110,000
Government-sponsored enterprises debt securities |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (674,000) |
Total Unrealized Losses | (674,000) |
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 44,326,000 |
Total Fair Value | 44,326,000 |
Residential - Government-sponsored enterprises |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (134,845,000) | (10,876,000)
12 Months or More Unrealized Losses | (34,226,000) | (1,543,000)
Total Unrealized Losses | (169,071,000) | (12,419,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 994,823,000 | 1,230,104,000
12 Months or More Fair Value | 203,018,000 | 32,415,000
Total Fair Value | 1,197,841,000 | 1,262,519,000
Residential - Government agency |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (7,335,000) | (291,000)
Total Unrealized Losses | (7,335,000) | (291,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 61,634,000 | 51,231,000
Total Fair Value | 61,634,000 | 51,231,000
Commercial - Government agency |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (13,928,000) | (5,239,000)
12 Months or More Unrealized Losses | (26,021,000) | (1,282,000)
Total Unrealized Losses | (39,949,000) | (6,521,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 117,444,000 | 186,024,000
12 Months or More Fair Value | 133,221,000 | 26,063,000
Total Fair Value | 250,665,000 | 212,087,000
Commercial - Government-sponsored enterprises |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (7,080,000) | (22,179,000)
12 Months or More Unrealized Losses | (3,652,000) | (26,535,000)
Total Unrealized Losses | (10,732,000) | (48,714,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 106,268,000 | 744,819,000
12 Months or More Fair Value | 25,053,000 | 397,123,000
Total Fair Value | 131,321,000 | 1,141,942,000
Commercial - Non -agency |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (290,000) |
Total Unrealized Losses | (290,000) |
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 21,670,000 |
Total Fair Value | 21,670,000 |
Government agency |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (74,722,000) | (31,432,000)
12 Months or More Unrealized Losses | (226,000) |
Total Unrealized Losses | (74,948,000) | (31,432,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 691,942,000 | 1,441,848,000
12 Months or More Fair Value | 2,271,000 |
Total Fair Value | 694,213,000 | 1,441,848,000
Government-sponsored enterprises |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (25,190,000) | (52,551,000)
12 Months or More Unrealized Losses | (38,452,000) | (1,144,000)
Total Unrealized Losses | (63,642,000) | (53,695,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 258,825,000 | 2,255,535,000
12 Months or More Fair Value | 230,623,000 | 24,959,000
Total Fair Value | 489,448,000 | $ 2,280,494,000
Collateralized Loan Obligations |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (4,455,000) |
Total Unrealized Losses | (4,455,000) |
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 169,242,000 |
Total Fair Value | $ 169,242,000 |

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