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Investment Securities - Unrealized Gross Losses and Fair Values of Securities in a Continuous Loss Position (Details) | Sep. 30, 2021 USD ($) security | Dec. 31, 2020 USD ($) security
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Securities in the available-for-sale portfolio in a continuous loss position |  |
Number of individual securities in a continuous loss position | security | 230 | 50
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | $ (72,612,000) | $ (10,705,000)
12 Months or More Unrealized Losses | (13,703,000) | (25,000)
Total Unrealized Losses | (86,315,000) | (10,730,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 4,599,714,000 | 1,068,883,000
12 Months or More Fair Value | 187,579,000 | 6,190,000
Total Fair Value | 4,787,293,000 | 1,075,073,000
Credit losses | 0 | 0
Amortized cost basis | 0 | 0
U.S. Treasury and government agency debt securities |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (1,552,000) | (61,000)
Total Unrealized Losses | (1,552,000) | (61,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 128,093,000 | 38,507,000
Total Fair Value | 128,093,000 | 38,507,000
Residential - Government-sponsored enterprises |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (5,799,000) | (725,000)
12 Months or More Unrealized Losses | (642,000) |
Total Unrealized Losses | (6,441,000) | (725,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 818,313,000 | 64,987,000
12 Months or More Fair Value | 20,693,000 |
Total Fair Value | 839,006,000 | 64,987,000
Commercial - Government agency |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (4,960,000) | (119,000)
12 Months or More Unrealized Losses | (246,000) |
Total Unrealized Losses | (5,206,000) | (119,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 230,013,000 | 32,346,000
12 Months or More Fair Value | 6,901,000 |
Total Fair Value | 236,914,000 | 32,346,000
Commercial - Government-sponsored enterprises |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (27,869,000) | (7,983,000)
12 Months or More Unrealized Losses | (12,815,000) |
Total Unrealized Losses | (40,684,000) | (7,983,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 874,759,000 | 427,759,000
12 Months or More Fair Value | 159,985,000 |
Total Fair Value | 1,034,744,000 | 427,759,000
Government agency |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (9,623,000) | (994,000)
12 Months or More Unrealized Losses |  | (25,000)
Total Unrealized Losses | (9,623,000) | (1,019,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 936,557,000 | 209,124,000
12 Months or More Fair Value |  | 6,190,000
Total Fair Value | 936,557,000 | 215,314,000
Government-sponsored enterprises |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (22,809,000) | (823,000)
Total Unrealized Losses | (22,809,000) | (823,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 1,611,979,000 | 296,160,000
Total Fair Value | $ 1,611,979,000 | $ 296,160,000

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