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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2025
Investment Securities |
Schedule of amortized cost and fair value of securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2025 | ​ | December 31, 2024
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(dollars in thousands) |  | Cost |  | Gains |  | Losses |  | Value |  | Cost |  | Gains |  | Losses |  | Value
Government agency debt securities | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 8,170 | ​ | $ | — | ​ | $ | (23) | ​ | $ | 8,147
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 32,641 | ​ | ​ | 279 | ​ | ​ | (1,086) | ​ | ​ | 31,834 | ​ | ​ | 37,473 | ​ | ​ | — | ​ | ​ | (1,614) | ​ | ​ | 35,859
Residential - Government-sponsored enterprises | ​ | ​ | 840,130 | ​ | ​ | 1,564 | ​ | ​ | (66,253) | ​ | ​ | 775,441 | ​ | ​ | 840,836 | ​ | ​ | — | ​ | ​ | (102,723) | ​ | ​ | 738,113
Commercial - Government agency | ​ | ​ | 239,479 | ​ | ​ | — | ​ | ​ | (48,312) | ​ | ​ | 191,167 | ​ | ​ | 249,348 | ​ | ​ | — | ​ | ​ | (53,223) | ​ | ​ | 196,125
Commercial - Government-sponsored enterprises | ​ | ​ | 43,761 | ​ | ​ | — | ​ | ​ | (1,548) | ​ | ​ | 42,213 | ​ | ​ | 48,015 | ​ | ​ | — | ​ | ​ | (3,107) | ​ | ​ | 44,908
Commercial - Non-agency | ​ | ​ | 120,793 | ​ | ​ | 641 | ​ | ​ | (24) | ​ | ​ | 121,410 | ​ | ​ | 22,000 | ​ | ​ | 83 | ​ | ​ | — | ​ | ​ | 22,083
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 475,946 | ​ | ​ | 800 | ​ | ​ | (40,455) | ​ | ​ | 436,291 | ​ | ​ | 452,038 | ​ | ​ | — | ​ | ​ | (54,914) | ​ | ​ | 397,124
Government-sponsored enterprises | ​ | ​ | 327,554 | ​ | ​ | 541 | ​ | ​ | (37,675) | ​ | ​ | 290,420 | ​ | ​ | 359,416 | ​ | ​ | — | ​ | ​ | (48,734) | ​ | ​ | 310,682
Collateralized loan obligations | ​ | ​ | 97,788 | ​ | ​ | 153 | ​ | ​ | — | ​ | ​ | 97,941 | ​ | ​ | 173,152 | ​ | ​ | 323 | ​ | ​ | — | ​ | ​ | 173,475
Total available-for-sale securities | ​ | $ | 2,178,092 | ​ | $ | 3,978 | ​ | $ | (195,353) | ​ | $ | 1,986,717 | ​ | $ | 2,190,448 | ​ | $ | 406 | ​ | $ | (264,338) | ​ | $ | 1,926,516
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency debt securities | ​ | $ | 47,514 | ​ | $ | — | ​ | $ | (3,557) | ​ | $ | 43,957 | ​ | $ | 49,267 | ​ | $ | — | ​ | $ | (5,398) | ​ | $ | 43,869
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 37,979 | ​ | ​ | — | ​ | ​ | (4,802) | ​ | ​ | 33,177 | ​ | ​ | 40,888 | ​ | ​ | — | ​ | ​ | (6,579) | ​ | ​ | 34,309
Residential - Government-sponsored enterprises | ​ | ​ | 88,255 | ​ | ​ | — | ​ | ​ | (11,393) | ​ | ​ | 76,862 | ​ | ​ | 92,573 | ​ | ​ | — | ​ | ​ | (14,854) | ​ | ​ | 77,719
Commercial - Government agency | ​ | ​ | 30,817 | ​ | ​ | — | ​ | ​ | (7,910) | ​ | ​ | 22,907 | ​ | ​ | 31,009 | ​ | ​ | — | ​ | ​ | (8,666) | ​ | ​ | 22,343
Commercial - Government-sponsored enterprises | ​ | ​ | 1,094,959 | ​ | ​ | 225 | ​ | ​ | (110,402) | ​ | ​ | 984,782 | ​ | ​ | 1,114,549 | ​ | ​ | 201 | ​ | ​ | (149,244) | ​ | ​ | 965,506
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 842,658 | ​ | ​ | — | ​ | ​ | (92,792) | ​ | ​ | 749,866 | ​ | ​ | 907,565 | ​ | ​ | — | ​ | ​ | (126,020) | ​ | ​ | 781,545
Government-sponsored enterprises | ​ | ​ | 1,397,112 | ​ | ​ | — | ​ | ​ | (149,497) | ​ | ​ | 1,247,615 | ​ | ​ | 1,500,212 | ​ | ​ | — | ​ | ​ | (210,721) | ​ | ​ | 1,289,491
Debt securities issued by states and political subdivisions | ​ | ​ | 54,894 | ​ | ​ | — | ​ | ​ | (4,177) | ​ | ​ | 50,717 | ​ | ​ | 54,587 | ​ | ​ | — | ​ | ​ | (6,860) | ​ | ​ | 47,727
Total held-to-maturity securities | ​ | $ | 3,594,188 | ​ | $ | 225 | ​ | $ | (384,530) | ​ | $ | 3,209,883 | ​ | $ | 3,790,650 | ​ | $ | 201 | ​ | $ | (528,342) | ​ | $ | 3,262,509
Schedule of amortized cost and fair value of debt securities by contractual maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2025
​ | ​ | Amortized | ​ | Fair
(dollars in thousands) |  | Cost |  | Value
Available-for-sale securities | ​ | ​ | ​ | ​ | ​ | ​
Due in one year or less | ​ | $ | — | ​ | $ | —
Due after one year through five years | ​ | ​ | 78,662 | ​ | ​ | 79,248
Due after five years through ten years | ​ | ​ | 93,938 | ​ | ​ | 94,091
Due after ten years | ​ | ​ | 45,981 | ​ | ​ | 46,012
​ | ​ | ​ | 218,581 | ​ | ​ | 219,351
​ | ​ | ​ | ​ | ​ | ​ | ​
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 32,641 | ​ | ​ | 31,834
Residential - Government-sponsored enterprises | ​ | ​ | 840,130 | ​ | ​ | 775,441
Commercial - Government agency | ​ | ​ | 239,479 | ​ | ​ | 191,167
Commercial - Government-sponsored enterprises | ​ | ​ | 43,761 | ​ | ​ | 42,213
Total mortgage-backed securities | ​ | ​ | 1,156,011 | ​ | ​ | 1,040,655
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 475,946 | ​ | ​ | 436,291
Government-sponsored enterprises | ​ | ​ | 327,554 | ​ | ​ | 290,420
Total collateralized mortgage obligations | ​ | ​ | 803,500 | ​ | ​ | 726,711
Total available-for-sale securities | ​ | $ | 2,178,092 | ​ | $ | 1,986,717
​ | ​ | ​ | ​ | ​ | ​ | ​
Held-to-maturity securities | ​ | ​ | ​ | ​ | ​ | ​
Due in one year or less | ​ | $ | — | ​ | $ | —
Due after one year through five years | ​ | ​ | — | ​ | ​ | —
Due after five years through ten years | ​ | ​ | 51,958 | ​ | ​ | 48,993
Due after ten years | ​ | ​ | 50,450 | ​ | ​ | 45,681
​ | ​ | ​ | 102,408 | ​ | ​ | 94,674
​ | ​ | ​ | ​ | ​ | ​ | ​
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 37,979 | ​ | ​ | 33,177
Residential - Government-sponsored enterprises | ​ | ​ | 88,255 | ​ | ​ | 76,862
Commercial - Government agency | ​ | ​ | 30,817 | ​ | ​ | 22,907
Commercial - Government-sponsored enterprises | ​ | ​ | 1,094,959 | ​ | ​ | 984,782
Total mortgage-backed securities | ​ | ​ | 1,252,010 | ​ | ​ | 1,117,728
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 842,658 | ​ | ​ | 749,866
Government-sponsored enterprises | ​ | ​ | 1,397,112 | ​ | ​ | 1,247,615
Total collateralized mortgage obligations | ​ | ​ | 2,239,770 | ​ | ​ | 1,997,481
Total held-to-maturity securities | ​ | $ | 3,594,188 | ​ | $ | 3,209,883
Schedule of gross unrealized losses and fair values of securities in a continuous loss position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Time in Continuous Loss as of September 30, 2025
​ | ​ | Less Than 12 Months | ​ | 12 Months or More | ​ | Total
​ | ​ | Unrealized | ​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​
(dollars in thousands) |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | $ | — | ​ | $ | — | ​ | $ | (1,086) | ​ | $ | 8,395 | ​ | $ | (1,086) | ​ | $ | 8,395
Residential - Government-sponsored enterprises | ​ | ​ | (233) | ​ | ​ | 51,145 | ​ | ​ | (66,020) | ​ | ​ | 572,041 | ​ | ​ | (66,253) | ​ | ​ | 623,186
Commercial - Government agency | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (48,312) | ​ | ​ | 191,167 | ​ | ​ | (48,312) | ​ | ​ | 191,167
Commercial - Government-sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (1,548) | ​ | ​ | 42,213 | ​ | ​ | (1,548) | ​ | ​ | 42,213
Commercial - Non-agency | ​ | ​ | (24) | ​ | ​ | 7,020 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (24) | ​ | ​ | 7,020
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | (18) | ​ | ​ | 16,203 | ​ | ​ | (40,437) | ​ | ​ | 292,492 | ​ | ​ | (40,455) | ​ | ​ | 308,695
Government-sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (37,675) | ​ | ​ | 236,744 | ​ | ​ | (37,675) | ​ | ​ | 236,744
Total available-for-sale securities with unrealized losses | ​ | $ | (275) | ​ | $ | 74,368 | ​ | $ | (195,078) | ​ | $ | 1,343,052 | ​ | $ | (195,353) | ​ | $ | 1,417,420
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Time in Continuous Loss as of December 31, 2024
​ | ​ | Less Than 12 Months | ​ | 12 Months or More | ​ | Total
​ | ​ | Unrealized | ​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​
(dollars in thousands) |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value
Government agency debt securities | ​ | $ | — | ​ | $ | — | ​ | $ | (23) | ​ | $ | 8,147 | ​ | $ | (23) | ​ | $ | 8,147
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | (154) | ​ | ​ | 27,127 | ​ | ​ | (1,460) | ​ | ​ | 8,732 | ​ | ​ | (1,614) | ​ | ​ | 35,859
Residential - Government-sponsored enterprises | ​ | ​ | (2,997) | ​ | ​ | 116,084 | ​ | ​ | (99,726) | ​ | ​ | 622,029 | ​ | ​ | (102,723) | ​ | ​ | 738,113
Commercial - Government agency | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (53,223) | ​ | ​ | 196,125 | ​ | ​ | (53,223) | ​ | ​ | 196,125
Commercial - Government-sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (3,107) | ​ | ​ | 44,908 | ​ | ​ | (3,107) | ​ | ​ | 44,908
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | (712) | ​ | ​ | 76,968 | ​ | ​ | (54,202) | ​ | ​ | 310,171 | ​ | ​ | (54,914) | ​ | ​ | 387,139
Government-sponsored enterprises | ​ | ​ | (912) | ​ | ​ | 57,509 | ​ | ​ | (47,822) | ​ | ​ | 253,173 | ​ | ​ | (48,734) | ​ | ​ | 310,682
Total available-for-sale securities with unrealized losses | ​ | $ | (4,775) | ​ | $ | 277,688 | ​ | $ | (259,563) | ​ | $ | 1,443,285 | ​ | $ | (264,338) | ​ | $ | 1,720,973

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