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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, 2023 USD ($) security shares | Dec. 31, 2022 USD ($) security shares
Securities in the available-for-sale portfolio in a continuous loss position |  |
Number of individual securities in a continuous loss position | security | 279 | 275
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | $ (973,000) | $ (213,696,000)
12 Months or More Unrealized Losses | (448,375,000) | (184,820,000)
Total Unrealized Losses | (449,348,000) | (398,516,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 75,258,000 | 2,023,259,000
12 Months or More Fair Value | 2,645,713,000 | 1,056,595,000
Total Fair Value | 2,720,971,000 | 3,079,854,000
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 | 5.00% | 5.00%
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 |  | (2,962,000)
12 Months or More Unrealized Losses | (12,105,000) | (9,365,000)
Total Unrealized Losses | (12,105,000) | (12,327,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value |  | 83,870,000
12 Months or More Fair Value | 114,159,000 | 67,112,000
Total Fair Value | 114,159,000 | 150,982,000
Government-sponsored enterprises debt securities |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses |  | (699,000)
12 Months or More Unrealized Losses | (740,000) |
Total Unrealized Losses | (740,000) | (699,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value |  | 44,301,000
12 Months or More Fair Value | 19,260,000 |
Total Fair Value | 19,260,000 | 44,301,000
Residential - Government-sponsored enterprises |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses |  | (73,954,000)
12 Months or More Unrealized Losses | (179,487,000) | (83,309,000)
Total Unrealized Losses | (179,487,000) | (157,263,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value |  | 645,338,000
12 Months or More Fair Value | 1,005,782,000 | 515,117,000
Total Fair Value | 1,005,782,000 | 1,160,455,000
Residential - Government agency |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses |  | (7,069,000)
12 Months or More Unrealized Losses | (9,406,000) |
Total Unrealized Losses | (9,406,000) | (7,069,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value |  | 59,723,000
12 Months or More Fair Value | 52,362,000 |
Total Fair Value | 52,362,000 | 59,723,000
Commercial - Government agency |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses |  | (15,852,000)
12 Months or More Unrealized Losses | (60,535,000) | (28,995,000)
Total Unrealized Losses | (60,535,000) | (44,847,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value |  | 108,842,000
12 Months or More Fair Value | 211,897,000 | 129,011,000
Total Fair Value | 211,897,000 | 237,853,000
Commercial - Government-sponsored enterprises |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses |  | (7,348,000)
12 Months or More Unrealized Losses | (9,101,000) | (3,691,000)
Total Unrealized Losses | (9,101,000) | (11,039,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value |  | 94,657,000
12 Months or More Fair Value | 84,920,000 | 24,916,000
Total Fair Value | 84,920,000 | 119,573,000
Commercial - Non -agency |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses |  | (493,000)
12 Months or More Unrealized Losses | (362,000) |
Total Unrealized Losses | (362,000) | (493,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value |  | 21,471,000
12 Months or More Fair Value | 21,602,000 |
Total Fair Value | 21,602,000 | 21,471,000
Government agency |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses |  | (74,797,000)
12 Months or More Unrealized Losses | (95,355,000) | (10,405,000)
Total Unrealized Losses | (95,355,000) | (85,202,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value |  | 596,907,000
12 Months or More Fair Value | 565,852,000 | 56,415,000
Total Fair Value | 565,852,000 | 653,322,000
Government-sponsored enterprises |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses |  | (21,916,000)
12 Months or More Unrealized Losses | (78,469,000) | (49,055,000)
Total Unrealized Losses | (78,469,000) | (70,971,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value |  | 198,108,000
12 Months or More Fair Value | 400,748,000 | 264,024,000
Total Fair Value | 400,748,000 | 462,132,000
Collateralized Loan Obligations |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (973,000) | (8,606,000)
12 Months or More Unrealized Losses | (2,815,000) |
Total Unrealized Losses | (3,788,000) | (8,606,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 75,258,000 | 170,042,000
12 Months or More Fair Value | 169,131,000 |
Total Fair Value | $ 244,389,000 | $ 170,042,000

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