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Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2025
Investments, Debt and Equity Securities [Abstract] |
Schedule of Available-for-Sale Securities Reconciliation [Table Text Block] | The amortized cost and fair values of AFS and HTM securities at June 30, 2025 were as follows:
(in thousands) | Amortized Cost | Gross Unrealized Gains | Gross Unrealized (Losses) | Fair Value
AFS investment securities |  |  |  |
Obligations of state and political subdivisions (municipal securities) | $ | 3,063 |  | $ | — |  | $ | (71) |  | $ | 2,993 |
Residential mortgage-related securities: |  |  |  |
FNMA/FHLMC | 126,138 |  | 500 |  | (6,725) |  | 119,914 |
GNMA | 4,640,079 |  | 42,498 |  | (162) |  | 4,682,415 |
Commercial mortgage-related securities: |  |  |  |
FNMA/FHLMC | 18,147 |  | — |  | (1,210) |  | 16,937 |
GNMA | 114,881 |  | — |  | (4,495) |  | 110,386 |
Asset backed securities: |  |  |  |
FFELP | 102,177 |  | — |  | (1,689) |  | 100,489 |
SBA | 394 |  | — |  | (17) |  | 377 |
Other debt securities | 3,000 |  | — |  | (2) |  | 2,998 |
Total AFS investment securities | $ | 5,007,880 |  | $ | 42,999 |  | $ | (14,370) |  | $ | 5,036,508 |
HTM investment securities |  |  |  |
U.S. Treasury securities | $ | 994 |  | $ | 18 |  | $ | — |  | $ | 1,013 |
Obligations of state and political subdivisions (municipal securities) | 1,643,021 |  | 578 |  | (201,630) |  | 1,441,969 |
Residential mortgage-related securities: |  |  |  |
FNMA/FHLMC | 854,777 |  | 20,900 |  | (168,381) |  | 707,296 |
GNMA | 42,028 |  | 12 |  | (2,904) |  | 39,136 |
Private-label | 313,439 |  | 7,387 |  | (58,290) |  | 262,536 |
Commercial mortgage-related securities: |  |  |  |
FNMA/FHLMC | 768,503 |  | 9,063 |  | (133,145) |  | 644,422 |
GNMA | 49,399 |  | 197 |  | (5,637) |  | 43,959 |
Total HTM investment securities | $ | 3,672,161 |  | $ | 38,157 |  | $ | (569,986) |  | $ | 3,140,331 |
The amortized cost and fair values of AFS and HTM securities at December 31, 2024 were as follows:
(in thousands) | Amortized Cost | Gross Unrealized Gains | Gross Unrealized (Losses) | Fair Value
AFS investment securities |  |  |  |
Obligations of state and political subdivisions (municipal securities) | $ | 3,063 |  | $ | — |  | $ | (58) |  | $ | 3,005 |
Residential mortgage-related securities: |  |  |  |
FNMA/FHLMC | 120,272 |  | 190 |  | (9,534) |  | 110,928 |
GNMA | 4,236,199 |  | 5,379 |  | (13,851) |  | 4,227,727 |
Commercial mortgage-related securities: |  |  |  |
FNMA/FHLMC | 18,332 |  | — |  | (1,332) |  | 17,000 |
GNMA | 116,275 |  | — |  | (4,800) |  | 111,475 |
Asset backed securities: |  |  |  |
FFELP | 108,319 |  | 123 |  | (604) |  | 107,839 |
SBA | 495 |  | — |  | (24) |  | 471 |
Other debt securities | 3,000 |  | — |  | (11) |  | 2,989 |
Total AFS investment securities | $ | 4,605,954 |  | $ | 5,693 |  | $ | (30,213) |  | $ | 4,581,434 |
HTM investment securities |  |  |  |
U.S. Treasury securities | $ | 1,000 |  | $ | — |  | $ | (1) |  | $ | 999 |
Obligations of state and political subdivisions (municipal securities) | 1,659,722 |  | 1,122 |  | (174,202) |  | 1,486,642 |
Residential mortgage-related securities: |  |  |  |
FNMA/FHLMC | 885,476 |  | 22,934 |  | (186,464) |  | 721,946 |
GNMA | 43,693 |  | 9 |  | (3,774) |  | 39,927 |
Private-label | 324,182 |  | 8,135 |  | (65,963) |  | 266,353 |
Commercial mortgage-related securities: |  |  |  |
FNMA/FHLMC | 772,456 |  | 10,217 |  | (159,078) |  | 623,595 |
GNMA | 52,219 |  | 236 |  | (6,424) |  | 46,032 |
Total HTM investment securities | $ | 3,738,747 |  | $ | 42,653 |  | $ | (595,906) |  | $ | 3,185,494 |
Debt Securities, Held-to-Maturity [Table Text Block] | The amortized cost and fair values of AFS and HTM securities at June 30, 2025 were as follows:
(in thousands) | Amortized Cost | Gross Unrealized Gains | Gross Unrealized (Losses) | Fair Value
AFS investment securities |  |  |  |
Obligations of state and political subdivisions (municipal securities) | $ | 3,063 |  | $ | — |  | $ | (71) |  | $ | 2,993 |
Residential mortgage-related securities: |  |  |  |
FNMA/FHLMC | 126,138 |  | 500 |  | (6,725) |  | 119,914 |
GNMA | 4,640,079 |  | 42,498 |  | (162) |  | 4,682,415 |
Commercial mortgage-related securities: |  |  |  |
FNMA/FHLMC | 18,147 |  | — |  | (1,210) |  | 16,937 |
GNMA | 114,881 |  | — |  | (4,495) |  | 110,386 |
Asset backed securities: |  |  |  |
FFELP | 102,177 |  | — |  | (1,689) |  | 100,489 |
SBA | 394 |  | — |  | (17) |  | 377 |
Other debt securities | 3,000 |  | — |  | (2) |  | 2,998 |
Total AFS investment securities | $ | 5,007,880 |  | $ | 42,999 |  | $ | (14,370) |  | $ | 5,036,508 |
HTM investment securities |  |  |  |
U.S. Treasury securities | $ | 994 |  | $ | 18 |  | $ | — |  | $ | 1,013 |
Obligations of state and political subdivisions (municipal securities) | 1,643,021 |  | 578 |  | (201,630) |  | 1,441,969 |
Residential mortgage-related securities: |  |  |  |
FNMA/FHLMC | 854,777 |  | 20,900 |  | (168,381) |  | 707,296 |
GNMA | 42,028 |  | 12 |  | (2,904) |  | 39,136 |
Private-label | 313,439 |  | 7,387 |  | (58,290) |  | 262,536 |
Commercial mortgage-related securities: |  |  |  |
FNMA/FHLMC | 768,503 |  | 9,063 |  | (133,145) |  | 644,422 |
GNMA | 49,399 |  | 197 |  | (5,637) |  | 43,959 |
Total HTM investment securities | $ | 3,672,161 |  | $ | 38,157 |  | $ | (569,986) |  | $ | 3,140,331 |
The amortized cost and fair values of AFS and HTM securities at December 31, 2024 were as follows:
(in thousands) | Amortized Cost | Gross Unrealized Gains | Gross Unrealized (Losses) | Fair Value
AFS investment securities |  |  |  |
Obligations of state and political subdivisions (municipal securities) | $ | 3,063 |  | $ | — |  | $ | (58) |  | $ | 3,005 |
Residential mortgage-related securities: |  |  |  |
FNMA/FHLMC | 120,272 |  | 190 |  | (9,534) |  | 110,928 |
GNMA | 4,236,199 |  | 5,379 |  | (13,851) |  | 4,227,727 |
Commercial mortgage-related securities: |  |  |  |
FNMA/FHLMC | 18,332 |  | — |  | (1,332) |  | 17,000 |
GNMA | 116,275 |  | — |  | (4,800) |  | 111,475 |
Asset backed securities: |  |  |  |
FFELP | 108,319 |  | 123 |  | (604) |  | 107,839 |
SBA | 495 |  | — |  | (24) |  | 471 |
Other debt securities | 3,000 |  | — |  | (11) |  | 2,989 |
Total AFS investment securities | $ | 4,605,954 |  | $ | 5,693 |  | $ | (30,213) |  | $ | 4,581,434 |
HTM investment securities |  |  |  |
U.S. Treasury securities | $ | 1,000 |  | $ | — |  | $ | (1) |  | $ | 999 |
Obligations of state and political subdivisions (municipal securities) | 1,659,722 |  | 1,122 |  | (174,202) |  | 1,486,642 |
Residential mortgage-related securities: |  |  |  |
FNMA/FHLMC | 885,476 |  | 22,934 |  | (186,464) |  | 721,946 |
GNMA | 43,693 |  | 9 |  | (3,774) |  | 39,927 |
Private-label | 324,182 |  | 8,135 |  | (65,963) |  | 266,353 |
Commercial mortgage-related securities: |  |  |  |
FNMA/FHLMC | 772,456 |  | 10,217 |  | (159,078) |  | 623,595 |
GNMA | 52,219 |  | 236 |  | (6,424) |  | 46,032 |
Total HTM investment securities | $ | 3,738,747 |  | $ | 42,653 |  | $ | (595,906) |  | $ | 3,185,494 |
Investments Classified by Contractual Maturity Date [Table Text Block] | The expected maturities of AFS and HTM securities at June 30, 2025, are shown below:
| AFS | HTM
(in thousands) | Amortized Cost | Fair Value | Amortized Cost | Fair Value
Due in one year or less | $ | 1,000 |  | $ | 998 |  | $ | 7,686 |  | $ | 7,679 |
Due after one year through five years | 3,040 |  | 3,029 |  | 89,077 |  | 88,681 |
Due after five years through ten years | 1,390 |  | 1,390 |  | 219,972 |  | 211,472 |
Due after ten years | 633 |  | 573 |  | 1,327,280 |  | 1,135,150 |
Total debt securities | 6,063 |  | 5,991 |  | 1,644,015 |  | 1,442,982 |
Residential mortgage-related securities: |  |  |  |
FNMA/FHLMC | 126,138 |  | 119,914 |  | 854,777 |  | 707,296 |
GNMA | 4,640,079 |  | 4,682,415 |  | 42,028 |  | 39,136 |
Private-label | — |  | — |  | 313,439 |  | 262,536 |
Commercial mortgage-related securities: |  |  |  |
FNMA/FHLMC | 18,147 |  | 16,937 |  | 768,503 |  | 644,422 |
GNMA | 114,881 |  | 110,386 |  | 49,399 |  | 43,959 |
Asset backed securities: |  |  |  |
FFELP | 102,177 |  | 100,489 |  | — |  | — |
SBA | 394 |  | 377 |  | — |  | — |
Total investment securities | $ | 5,007,880 |  | $ | 5,036,508 |  | $ | 3,672,161 |  | $ | 3,140,331 |
Ratio of fair value to amortized cost |  | 100.6 | % |  | 85.5 | %
Debt Securities, Held-to-Maturity, Credit Quality Indicator [Table Text Block] | The following table summarizes the credit quality indicators of HTM securities at amortized cost at June 30, 2025:
(in thousands) | AAA | AA | A |  |  |  | Not Rated | Total
U.S. Treasury securities | $ | 994 |  |  |  |  |  |  |  | $ | 994 |
Obligations of state and political subdivisions (municipal securities) | 759,281 |  | 869,223 |  | 8,913 |  |  |  |  | 5,605 |  | 1,643,021 |
Residential mortgage-related securities: |  |  |  |  |  |  |  |
FNMA/FHLMC | 854,777 |  |  |  |  |  |  |  | 854,777 |
GNMA | 42,028 |  |  |  |  |  |  |  | 42,028 |
Private-label | 313,439 |  |  |  |  |  |  |  | 313,439 |
Commercial mortgage-related securities: |  |  |  |  |  |  |  |
FNMA/FHLMC | 768,503 |  |  |  |  |  |  |  | 768,503 |
GNMA | 49,399 |  |  |  |  |  |  |  | 49,399 |
Total HTM securities | $ | 2,788,421 |  | $ | 869,223 |  | $ | 8,913 |  |  |  |  | $ | 5,605 |  | $ | 3,672,161 |
The following table summarizes the credit quality indicators of HTM securities at amortized cost at December 31, 2024:
(in thousands) | AAA | AA | A |  |  |  | Not Rated | Total
U.S. Treasury securities | $ | 1,000 |  | $ | — |  | $ | — |  |  |  |  | $ | — |  | $ | 1,000 |
Obligations of state and political subdivisions (municipal securities) | 767,151 |  | 883,438 |  | 4,911 |  |  |  |  | 4,221 |  | 1,659,722 |
Residential mortgage-related securities: |  |  |  |  |  |  |  |
FNMA/FHLMC | 885,476 |  | — |  | — |  |  |  |  | — |  | 885,476 |
GNMA | 43,693 |  | — |  | — |  |  |  |  | — |  | 43,693 |
Private-label | 324,182 |  | — |  | — |  |  |  |  | — |  | 324,182 |
Commercial mortgage-related securities: |  |  |  |  |  |  |  |
FNMA/FHLMC | 772,456 |  | — |  | — |  |  |  |  | — |  | 772,456 |
GNMA | 52,219 |  | — |  | — |  |  |  |  | — |  | 52,219 |
Total HTM securities | $ | 2,846,177 |  | $ | 883,438 |  | $ | 4,911 |  |  |  |  | $ | 4,221 |  | $ | 3,738,747 |
Schedule of Realized Gain (Loss) [Table Text Block] | The following table summarizes gross realized gains and losses on AFS securities, the gain or loss on sale and fair value adjustment of equity securities, and proceeds from the sale of AFS investment securities:
| Three Months Ended Jun 30, | Six Months Ended Jun 30,
(in thousands) | 2025 | 2024 | 2025 | 2024
Gross realized (losses) on AFS securities | $ | — |  | $ | — |  | $ | — |  | $ | (197) |
Gain on sale of equity securities | — |  | — |  | — |  | 4,054 |
Fair value adjustment of equity securities | 4 |  | 67 |  | 11 |  | 90 |
Investment securities gains, net | $ | 4 |  | $ | 67 |  | $ | 11 |  | $ | 3,947 |
Proceeds from sales of AFS investment securities | $ | — |  | $ | — |  | $ | — |  | $ | 9,472 |
Schedule of Unrealized Loss on Investments [Table Text Block] | The following represents gross unrealized losses and the related fair value of AFS and HTM securities, aggregated by investment category and length of time individual securities have been in a continuous unrealized loss position, at June 30, 2025:
| Less than 12 months | 12 months or more | Total
(in thousands) | Number of Securities | Unrealized (Losses) | Fair Value | Number of Securities | Unrealized (Losses) | Fair Value | Unrealized (Losses) | Fair Value
AFS investment securities |  |  |  |  |  |  |  |
Obligations of state and political subdivisions (municipal securities) | 1 |  | $ | — |  | $ | 545 |  | 2 |  | $ | (71) |  | $ | 812 |  | $ | (71) |  | 1,357 |
Residential mortgage-related securities: |  |  |  |  |  |  |  |
FNMA/FHLMC | 19 |  | (216) |  | 25,111 |  | 14 |  | (6,509) |  | 60,428 |  | (6,725) |  | 85,538 |
GNMA | 11 |  | (81) |  | 60,239 |  | 5 |  | (81) |  | 4,956 |  | (162) |  | 65,195 |
Commercial mortgage-related securities: |  |  |  |  |  |  |  |
FNMA/FHLMC | — |  | — |  | — |  | 1 |  | (1,210) |  | 16,937 |  | (1,210) |  | 16,937 |
GNMA | — |  | — |  | — |  | 16 |  | (4,495) |  | 110,386 |  | (4,495) |  | 110,386 |
Asset backed securities: |  |  |  |  |  |  |  |
FFELP | 3 |  | (389) |  | 41,906 |  | 12 |  | (1,300) |  | 58,583 |  | (1,689) |  | 100,489 |
SBA | — |  | — |  | — |  | 4 |  | (17) |  | 369 |  | (17) |  | 369 |
Other debt securities | 1 |  | (2) |  | 998 |  | — |  | — |  | — |  | (2) |  | 998 |
Total | 35 |  | $ | (688) |  | $ | 128,798 |  | 54 |  | $ | (13,682) |  | $ | 252,471 |  | $ | (14,370) |  | $ | 381,269 |
HTM investment securities |  |  |  |  |  |  |  |
Obligations of state and political subdivisions (municipal securities) | 343 |  | $ | (16,718) |  | $ | 486,300 |  | 651 |  | $ | (184,912) |  | $ | 863,436 |  | $ | (201,630) |  | $ | 1,349,736 |
Residential mortgage-related securities: |  |  |  |  |  |  |  |
FNMA/FHLMC | 9 |  | (110) |  | 8,687 |  | 106 |  | (168,271) |  | 695,891 |  | (168,381) |  | 704,578 |
GNMA | 6 |  | (88) |  | 7,432 |  | 79 |  | (2,816) |  | 30,402 |  | (2,904) |  | 37,835 |
Private-label | — |  | — |  | — |  | 18 |  | (58,290) |  | 262,536 |  | (58,290) |  | 262,536 |
Commercial mortgage-related securities: |  |  |  |  |  |  |  |
FNMA/FHLMC | 2 |  | (481) |  | 26,335 |  | 43 |  | (132,664) |  | 618,087 |  | (133,145) |  | 644,422 |
GNMA | — |  | — |  | — |  | 13 |  | (5,637) |  | 43,959 |  | (5,637) |  | 43,959 |
Total | 360 |  | $ | (17,397) |  | $ | 528,754 |  | 910 |  | $ | (552,590) |  | $ | 2,514,312 |  | $ | (569,986) |  | $ | 3,043,067 |
For comparative purposes, the following represents gross unrealized losses and the related fair value of AFS and HTM securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2024:
| Less than 12 months | 12 months or more | Total
(in thousands) | Number of Securities | Unrealized (Losses) | Fair Value | Number of Securities | Unrealized (Losses) | Fair Value | Unrealized (Losses) | Fair Value
AFS investment securities |  |  |  |  |  |  |  |
Obligations of state and political subdivisions (municipal securities) | 1 |  | $ | (3) |  | $ | 542 |  | 2 |  | $ | (55) |  | $ | 828 |  | $ | (58) |  | $ | 1,370 |
Residential mortgage-related securities: |  |  |  |  |  |  |  |
FNMA/FHLMC | 23 |  | (607) |  | 31,983 |  | 14 |  | (8,927) |  | 61,596 |  | (9,534) |  | 93,579 |
GNMA | 116 |  | (13,706) |  | 1,660,642 |  | 4 |  | (145) |  | 3,945 |  | (13,851) |  | 1,664,587 |
Commercial mortgage-related securities: |  |  |  |  |  |  |  |
FNMA/FHLMC | — |  | — |  | — |  | 1 |  | (1,332) |  | 17,000 |  | (1,332) |  | 17,000 |
GNMA | — |  | — |  | — |  | 16 |  | (4,800) |  | 111,475 |  | (4,800) |  | 111,475 |
Asset backed securities: |  |  |  |  |  |  |  |
FFELP | — |  | — |  | — |  | 12 |  | (604) |  | 62,830 |  | (604) |  | 62,830 |
SBA | — |  | — |  | — |  | 4 |  | (24) |  | 464 |  | (24) |  | 464 |
Other debt securities | 1 |  | (7) |  | 993 |  | 1 |  | (3) |  | 997 |  | (11) |  | 1,989 |
Total | 141 |  | $ | (14,323) |  | $ | 1,694,159 |  | 54 |  | $ | (15,890) |  | $ | 259,134 |  | $ | (30,213) |  | $ | 1,953,294 |
HTM investment securities |  |  |  |  |  |  |  |
U.S. Treasury securities | — |  | $ | — |  | $ | — |  | 1 |  | $ | (1) |  | $ | 999 |  | $ | (1) |  | $ | 999 |
Obligations of state and political subdivisions (municipal securities) | 370 |  | (11,860) |  | 483,073 |  | 641 |  | (162,343) |  | 866,949 |  | (174,202) |  | 1,350,022 |
Residential mortgage-related securities: |  |  |  |  |  |  |  |
FNMA/FHLMC | 12 |  | (280) |  | 11,617 |  | 106 |  | (186,184) |  | 710,114 |  | (186,464) |  | 721,732 |
GNMA | 7 |  | (183) |  | 8,856 |  | 79 |  | (3,591) |  | 31,071 |  | (3,774) |  | 39,927 |
Private-label | — |  | — |  | — |  | 18 |  | (65,963) |  | 266,353 |  | (65,963) |  | 266,353 |
Commercial mortgage-related securities: |  |  |  |  |  |  |  |
FNMA/FHLMC | 2 |  | (1,343) |  | 25,518 |  | 43 |  | (157,735) |  | 598,077 |  | (159,078) |  | 623,595 |
GNMA | — |  | — |  | — |  | 13 |  | (6,424) |  | 46,032 |  | (6,424) |  | 46,032 |
Total | 391 |  | $ | (13,665) |  | $ | 529,064 |  | 901 |  | $ | (582,241) |  | $ | 2,519,595 |  | $ | (595,906) |  | $ | 3,048,660 |

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- Definition Tabular disclosure of credit quality indicator for investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 + Details
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Namespace Prefix: | us-gaap_
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