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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, 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 | 281 | 275
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | $ (22,048,000) | $ (213,696,000)
12 Months or More Unrealized Losses | (365,405,000) | (184,820,000)
Total Unrealized Losses | (387,453,000) | (398,516,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 502,340,000 | 2,023,259,000
12 Months or More Fair Value | 2,407,032,000 | 1,056,595,000
Total Fair Value | 2,909,372,000 | 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 | (708,000) | (2,962,000)
12 Months or More Unrealized Losses | (11,001,000) | (9,365,000)
Total Unrealized Losses | (11,709,000) | (12,327,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 19,255,000 | 83,870,000
12 Months or More Fair Value | 97,630,000 | 67,112,000
Total Fair Value | 116,885,000 | 150,982,000
Government-sponsored enterprises debt securities |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (760,000) | (699,000)
Total Unrealized Losses | (760,000) | (699,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 44,240,000 | 44,301,000
Total Fair Value | 44,240,000 | 44,301,000
Residential - Government-sponsored enterprises |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (8,831,000) | (73,954,000)
12 Months or More Unrealized Losses | (137,552,000) | (83,309,000)
Total Unrealized Losses | (146,383,000) | (157,263,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 165,828,000 | 645,338,000
12 Months or More Fair Value | 917,164,000 | 515,117,000
Total Fair Value | 1,082,992,000 | 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 | (6,284,000) |
Total Unrealized Losses | (6,284,000) | (7,069,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value |  | 59,723,000
12 Months or More Fair Value | 57,202,000 |
Total Fair Value | 57,202,000 | 59,723,000
Commercial - Government agency |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (104,000) | (15,852,000)
12 Months or More Unrealized Losses | (50,799,000) | (28,995,000)
Total Unrealized Losses | (50,903,000) | (44,847,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 4,256,000 | 108,842,000
12 Months or More Fair Value | 221,206,000 | 129,011,000
Total Fair Value | 225,462,000 | 237,853,000
Commercial - Government-sponsored enterprises |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (546,000) | (7,348,000)
12 Months or More Unrealized Losses | (7,998,000) | (3,691,000)
Total Unrealized Losses | (8,544,000) | (11,039,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 15,738,000 | 94,657,000
12 Months or More Fair Value | 72,159,000 | 24,916,000
Total Fair Value | 87,897,000 | 119,573,000
Commercial - Non -agency |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (585,000) | (493,000)
Total Unrealized Losses | (585,000) | (493,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 21,379,000 | 21,471,000
Total Fair Value | 21,379,000 | 21,471,000
Government agency |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (1,260,000) | (74,797,000)
12 Months or More Unrealized Losses | (82,363,000) | (10,405,000)
Total Unrealized Losses | (83,623,000) | (85,202,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 31,225,000 | 596,907,000
12 Months or More Fair Value | 573,996,000 | 56,415,000
Total Fair Value | 605,221,000 | 653,322,000
Government-sponsored enterprises |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (2,894,000) | (21,916,000)
12 Months or More Unrealized Losses | (66,493,000) | (49,055,000)
Total Unrealized Losses | (69,387,000) | (70,971,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 36,881,000 | 198,108,000
12 Months or More Fair Value | 390,599,000 | 264,024,000
Total Fair Value | 427,480,000 | 462,132,000
Collateralized Loan Obligations |  |
Time in Continuous Loss, Unrealized Losses |  |
Less Than 12 Months Unrealized Losses | (6,360,000) | (8,606,000)
12 Months or More Unrealized Losses | (2,915,000) |
Total Unrealized Losses | (9,275,000) | (8,606,000)
Time in Continuous Loss, Fair Value |  |
Less Than 12 Months, Fair Value | 163,538,000 | 170,042,000
12 Months or More Fair Value | 77,076,000 |
Total Fair Value | $ 240,614,000 | $ 170,042,000

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