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Investment Securities (Tables) | 3 Months Ended
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Mar. 31, 2025
Investment Securities |
Schedule of amortized cost and fair value of securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 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 | ​ | ​ | 36,376 | ​ | ​ | 243 | ​ | ​ | (1,305) | ​ | ​ | 35,314 | ​ | ​ | 37,473 | ​ | ​ | — | ​ | ​ | (1,614) | ​ | ​ | 35,859
Residential - Government-sponsored enterprises | ​ | ​ | 814,089 | ​ | ​ | 5 | ​ | ​ | (86,677) | ​ | ​ | 727,417 | ​ | ​ | 840,836 | ​ | ​ | — | ​ | ​ | (102,723) | ​ | ​ | 738,113
Commercial - Government agency | ​ | ​ | 246,139 | ​ | ​ | — | ​ | ​ | (50,373) | ​ | ​ | 195,766 | ​ | ​ | 249,348 | ​ | ​ | — | ​ | ​ | (53,223) | ​ | ​ | 196,125
Commercial - Government-sponsored enterprises | ​ | ​ | 46,380 | ​ | ​ | — | ​ | ​ | (2,368) | ​ | ​ | 44,012 | ​ | ​ | 48,015 | ​ | ​ | — | ​ | ​ | (3,107) | ​ | ​ | 44,908
Commercial - Non-agency | ​ | ​ | 22,000 | ​ | ​ | 5 | ​ | ​ | — | ​ | ​ | 22,005 | ​ | ​ | 22,000 | ​ | ​ | 83 | ​ | ​ | — | ​ | ​ | 22,083
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 440,756 | ​ | ​ | 13 | ​ | ​ | (49,095) | ​ | ​ | 391,674 | ​ | ​ | 452,038 | ​ | ​ | — | ​ | ​ | (54,914) | ​ | ​ | 397,124
Government-sponsored enterprises | ​ | ​ | 348,881 | ​ | ​ | — | ​ | ​ | (43,144) | ​ | ​ | 305,737 | ​ | ​ | 359,416 | ​ | ​ | — | ​ | ​ | (48,734) | ​ | ​ | 310,682
Collateralized loan obligations | ​ | ​ | 136,413 | ​ | ​ | 109 | ​ | ​ | (19) | ​ | ​ | 136,503 | ​ | ​ | 173,152 | ​ | ​ | 323 | ​ | ​ | — | ​ | ​ | 173,475
Total available-for-sale securities | ​ | $ | 2,091,034 | ​ | $ | 375 | ​ | $ | (232,981) | ​ | $ | 1,858,428 | ​ | $ | 2,190,448 | ​ | $ | 406 | ​ | $ | (264,338) | ​ | $ | 1,926,516
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency debt securities | ​ | $ | 49,104 | ​ | $ | — | ​ | $ | (4,478) | ​ | $ | 44,626 | ​ | $ | 49,267 | ​ | $ | — | ​ | $ | (5,398) | ​ | $ | 43,869
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 39,912 | ​ | ​ | — | ​ | ​ | (5,671) | ​ | ​ | 34,241 | ​ | ​ | 40,888 | ​ | ​ | — | ​ | ​ | (6,579) | ​ | ​ | 34,309
Residential - Government-sponsored enterprises | ​ | ​ | 91,523 | ​ | ​ | — | ​ | ​ | (13,511) | ​ | ​ | 78,012 | ​ | ​ | 92,573 | ​ | ​ | — | ​ | ​ | (14,854) | ​ | ​ | 77,719
Commercial - Government agency | ​ | ​ | 31,056 | ​ | ​ | — | ​ | ​ | (8,698) | ​ | ​ | 22,358 | ​ | ​ | 31,009 | ​ | ​ | — | ​ | ​ | (8,666) | ​ | ​ | 22,343
Commercial - Government-sponsored enterprises | ​ | ​ | 1,103,962 | ​ | ​ | 209 | ​ | ​ | (137,358) | ​ | ​ | 966,813 | ​ | ​ | 1,114,549 | ​ | ​ | 201 | ​ | ​ | (149,244) | ​ | ​ | 965,506
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 887,439 | ​ | ​ | — | ​ | ​ | (111,525) | ​ | ​ | 775,914 | ​ | ​ | 907,565 | ​ | ​ | — | ​ | ​ | (126,020) | ​ | ​ | 781,545
Government-sponsored enterprises | ​ | ​ | 1,467,222 | ​ | ​ | — | ​ | ​ | (187,697) | ​ | ​ | 1,279,525 | ​ | ​ | 1,500,212 | ​ | ​ | — | ​ | ​ | (210,721) | ​ | ​ | 1,289,491
Debt securities issued by states and political subdivisions | ​ | ​ | 54,690 | ​ | ​ | — | ​ | ​ | (5,904) | ​ | ​ | 48,786 | ​ | ​ | 54,587 | ​ | ​ | — | ​ | ​ | (6,860) | ​ | ​ | 47,727
Total held-to-maturity securities | ​ | $ | 3,724,908 | ​ | $ | 209 | ​ | $ | (474,842) | ​ | $ | 3,250,275 | ​ | $ | 3,790,650 | ​ | $ | 201 | ​ | $ | (528,342) | ​ | $ | 3,262,509
Schedule of amortized cost and fair value of debt securities by contractual maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, 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 | ​ | ​ | 9,275 | ​ | ​ | 9,285
Due after five years through ten years | ​ | ​ | 127,138 | ​ | ​ | 127,218
Due after ten years | ​ | ​ | 22,000 | ​ | ​ | 22,005
​ | ​ | ​ | 158,413 | ​ | ​ | 158,508
​ | ​ | ​ | ​ | ​ | ​ | ​
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 36,376 | ​ | ​ | 35,314
Residential - Government-sponsored enterprises | ​ | ​ | 814,089 | ​ | ​ | 727,417
Commercial - Government agency | ​ | ​ | 246,139 | ​ | ​ | 195,766
Commercial - Government-sponsored enterprises | ​ | ​ | 46,380 | ​ | ​ | 44,012
Total mortgage-backed securities | ​ | ​ | 1,142,984 | ​ | ​ | 1,002,509
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 440,756 | ​ | ​ | 391,674
Government-sponsored enterprises | ​ | ​ | 348,881 | ​ | ​ | 305,737
Total collateralized mortgage obligations | ​ | ​ | 789,637 | ​ | ​ | 697,411
Total available-for-sale securities | ​ | $ | 2,091,034 | ​ | $ | 1,858,428
​ | ​ | ​ | ​ | ​ | ​ | ​
Held-to-maturity securities | ​ | ​ | ​ | ​ | ​ | ​
Due in one year or less | ​ | $ | — | ​ | $ | —
Due after one year through five years | ​ | ​ | — | ​ | ​ | —
Due after five years through ten years | ​ | ​ | 52,632 | ​ | ​ | 48,343
Due after ten years | ​ | ​ | 51,162 | ​ | ​ | 45,069
​ | ​ | ​ | 103,794 | ​ | ​ | 93,412
​ | ​ | ​ | ​ | ​ | ​ | ​
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 39,912 | ​ | ​ | 34,241
Residential - Government-sponsored enterprises | ​ | ​ | 91,523 | ​ | ​ | 78,012
Commercial - Government agency | ​ | ​ | 31,056 | ​ | ​ | 22,358
Commercial - Government-sponsored enterprises | ​ | ​ | 1,103,962 | ​ | ​ | 966,813
Total mortgage-backed securities | ​ | ​ | 1,266,453 | ​ | ​ | 1,101,424
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 887,439 | ​ | ​ | 775,914
Government-sponsored enterprises | ​ | ​ | 1,467,222 | ​ | ​ | 1,279,525
Total collateralized mortgage obligations | ​ | ​ | 2,354,661 | ​ | ​ | 2,055,439
Total held-to-maturity securities | ​ | $ | 3,724,908 | ​ | $ | 3,250,275
Schedule of gross unrealized losses and fair values of securities in a continuous loss position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Time in Continuous Loss as of March 31, 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 | ​ | $ | — | ​ | $ | — | ​ | $ | (1,305) | ​ | $ | 8,718 | ​ | $ | (1,305) | ​ | $ | 8,718
Residential - Government-sponsored enterprises | ​ | ​ | (1,512) | ​ | ​ | 114,923 | ​ | ​ | (85,165) | ​ | ​ | 606,556 | ​ | ​ | (86,677) | ​ | ​ | 721,479
Commercial - Government agency | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (50,373) | ​ | ​ | 195,766 | ​ | ​ | (50,373) | ​ | ​ | 195,766
Commercial - Government-sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (2,368) | ​ | ​ | 44,012 | ​ | ​ | (2,368) | ​ | ​ | 44,012
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | (937) | ​ | ​ | 75,714 | ​ | ​ | (48,158) | ​ | ​ | 306,599 | ​ | ​ | (49,095) | ​ | ​ | 382,313
Government-sponsored enterprises | ​ | ​ | (165) | ​ | ​ | 56,582 | ​ | ​ | (42,979) | ​ | ​ | 249,155 | ​ | ​ | (43,144) | ​ | ​ | 305,737
Collateralized loan obligations | ​ | ​ | (19) | ​ | ​ | 15,721 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (19) | ​ | ​ | 15,721
Total available-for-sale securities with unrealized losses | ​ | $ | (2,633) | ​ | $ | 262,940 | ​ | $ | (230,348) | ​ | $ | 1,410,806 | ​ | $ | (232,981) | ​ | $ | 1,673,746
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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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