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Investment Securities - Unrealized Gross Losses and Fair Values of Securities in a Continuous Loss Position (Details) | Jun. 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 | 162 | 50
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | $ (59,399,000) | $ (10,705,000)
12 Months or More Unrealized Losses | (217,000) | (25,000)
Total Unrealized Losses | (59,616,000) | (10,730,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 3,499,015,000 | 1,068,883,000
12 Months or More Fair Value | 7,064,000 | 6,190,000
Total Fair Value | 3,506,079,000 | 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 | (2,127,000) | (61,000)
Total Unrealized Losses | (2,127,000) | (61,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 120,987,000 | 38,507,000
Total Fair Value | 120,987,000 | 38,507,000
Residential - Government-sponsored enterprises |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (4,360,000) | (725,000)
Total Unrealized Losses | (4,360,000) | (725,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 618,414,000 | 64,987,000
Total Fair Value | 618,414,000 | 64,987,000
Commercial - Government agency |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (2,899,000) | (119,000)
12 Months or More Unrealized Losses | (217,000) |
Total Unrealized Losses | (3,116,000) | (119,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 193,041,000 | 32,346,000
12 Months or More Fair Value | 7,064,000 |
Total Fair Value | 200,105,000 | 32,346,000
Commercial - Government-sponsored enterprises |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (27,342,000) | (7,983,000)
Total Unrealized Losses | (27,342,000) | (7,983,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 865,899,000 | 427,759,000
Total Fair Value | 865,899,000 | 427,759,000
Government agency |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (5,667,000) | (994,000)
12 Months or More Unrealized Losses |  | (25,000)
Total Unrealized Losses | (5,667,000) | (1,019,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 463,392,000 | 209,124,000
12 Months or More Fair Value |  | 6,190,000
Total Fair Value | 463,392,000 | 215,314,000
Government-sponsored enterprises |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (17,004,000) | (823,000)
Total Unrealized Losses | (17,004,000) | (823,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 1,237,282,000 | 296,160,000
Total Fair Value | $ 1,237,282,000 | $ 296,160,000

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