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Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2025
Investment Securities |
Schedule of amortized cost and fair value of securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 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 | ​ | ​ | 35,295 | ​ | ​ | 286 | ​ | ​ | (1,209) | ​ | ​ | 34,372 | ​ | ​ | 37,473 | ​ | ​ | — | ​ | ​ | (1,614) | ​ | ​ | 35,859
Residential - Government-sponsored enterprises | ​ | ​ | 786,643 | ​ | ​ | 348 | ​ | ​ | (72,653) | ​ | ​ | 714,338 | ​ | ​ | 840,836 | ​ | ​ | — | ​ | ​ | (102,723) | ​ | ​ | 738,113
Commercial - Government agency | ​ | ​ | 243,434 | ​ | ​ | — | ​ | ​ | (49,424) | ​ | ​ | 194,010 | ​ | ​ | 249,348 | ​ | ​ | — | ​ | ​ | (53,223) | ​ | ​ | 196,125
Commercial - Government-sponsored enterprises | ​ | ​ | 45,844 | ​ | ​ | — | ​ | ​ | (1,931) | ​ | ​ | 43,913 | ​ | ​ | 48,015 | ​ | ​ | — | ​ | ​ | (3,107) | ​ | ​ | 44,908
Commercial - Non-agency | ​ | ​ | 88,812 | ​ | ​ | 504 | ​ | ​ | — | ​ | ​ | 89,316 | ​ | ​ | 22,000 | ​ | ​ | 83 | ​ | ​ | — | ​ | ​ | 22,083
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 426,641 | ​ | ​ | 119 | ​ | ​ | (42,773) | ​ | ​ | 383,987 | ​ | ​ | 452,038 | ​ | ​ | — | ​ | ​ | (54,914) | ​ | ​ | 397,124
Government-sponsored enterprises | ​ | ​ | 338,441 | ​ | ​ | 395 | ​ | ​ | (40,184) | ​ | ​ | 298,652 | ​ | ​ | 359,416 | ​ | ​ | — | ​ | ​ | (48,734) | ​ | ​ | 310,682
Collateralized loan obligations | ​ | ​ | 132,796 | ​ | ​ | 270 | ​ | ​ | — | ​ | ​ | 133,066 | ​ | ​ | 173,152 | ​ | ​ | 323 | ​ | ​ | — | ​ | ​ | 173,475
Total available-for-sale securities | ​ | $ | 2,097,906 | ​ | $ | 1,922 | ​ | $ | (208,174) | ​ | $ | 1,891,654 | ​ | $ | 2,190,448 | ​ | $ | 406 | ​ | $ | (264,338) | ​ | $ | 1,926,516
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency debt securities | ​ | $ | 47,692 | ​ | $ | — | ​ | $ | (3,837) | ​ | $ | 43,855 | ​ | $ | 49,267 | ​ | $ | — | ​ | $ | (5,398) | ​ | $ | 43,869
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 39,037 | ​ | ​ | — | ​ | ​ | (5,310) | ​ | ​ | 33,727 | ​ | ​ | 40,888 | ​ | ​ | — | ​ | ​ | (6,579) | ​ | ​ | 34,309
Residential - Government-sponsored enterprises | ​ | ​ | 89,907 | ​ | ​ | — | ​ | ​ | (12,880) | ​ | ​ | 77,027 | ​ | ​ | 92,573 | ​ | ​ | — | ​ | ​ | (14,854) | ​ | ​ | 77,719
Commercial - Government agency | ​ | ​ | 30,779 | ​ | ​ | — | ​ | ​ | (8,140) | ​ | ​ | 22,639 | ​ | ​ | 31,009 | ​ | ​ | — | ​ | ​ | (8,666) | ​ | ​ | 22,343
Commercial - Government-sponsored enterprises | ​ | ​ | 1,100,422 | ​ | ​ | 217 | ​ | ​ | (124,704) | ​ | ​ | 975,935 | ​ | ​ | 1,114,549 | ​ | ​ | 201 | ​ | ​ | (149,244) | ​ | ​ | 965,506
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 863,939 | ​ | ​ | — | ​ | ​ | (100,312) | ​ | ​ | 763,627 | ​ | ​ | 907,565 | ​ | ​ | — | ​ | ​ | (126,020) | ​ | ​ | 781,545
Government-sponsored enterprises | ​ | ​ | 1,432,249 | ​ | ​ | — | ​ | ​ | (168,283) | ​ | ​ | 1,263,966 | ​ | ​ | 1,500,212 | ​ | ​ | — | ​ | ​ | (210,721) | ​ | ​ | 1,289,491
Debt securities issued by states and political subdivisions | ​ | ​ | 54,789 | ​ | ​ | — | ​ | ​ | (4,867) | ​ | ​ | 49,922 | ​ | ​ | 54,587 | ​ | ​ | — | ​ | ​ | (6,860) | ​ | ​ | 47,727
Total held-to-maturity securities | ​ | $ | 3,658,814 | ​ | $ | 217 | ​ | $ | (428,333) | ​ | $ | 3,230,698 | ​ | $ | 3,790,650 | ​ | $ | 201 | ​ | $ | (528,342) | ​ | $ | 3,262,509
Schedule of amortized cost and fair value of debt securities by contractual maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 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 | ​ | ​ | 80,853 | ​ | ​ | 81,325
Due after five years through ten years | ​ | ​ | 126,755 | ​ | ​ | 127,022
Due after ten years | ​ | ​ | 14,000 | ​ | ​ | 14,035
​ | ​ | ​ | 221,608 | ​ | ​ | 222,382
​ | ​ | ​ | ​ | ​ | ​ | ​
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 35,295 | ​ | ​ | 34,372
Residential - Government-sponsored enterprises | ​ | ​ | 786,643 | ​ | ​ | 714,338
Commercial - Government agency | ​ | ​ | 243,434 | ​ | ​ | 194,010
Commercial - Government-sponsored enterprises | ​ | ​ | 45,844 | ​ | ​ | 43,913
Total mortgage-backed securities | ​ | ​ | 1,111,216 | ​ | ​ | 986,633
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 426,641 | ​ | ​ | 383,987
Government-sponsored enterprises | ​ | ​ | 338,441 | ​ | ​ | 298,652
Total collateralized mortgage obligations | ​ | ​ | 765,082 | ​ | ​ | 682,639
Total available-for-sale securities | ​ | $ | 2,097,906 | ​ | $ | 1,891,654
​ | ​ | ​ | ​ | ​ | ​ | ​
Held-to-maturity securities | ​ | ​ | ​ | ​ | ​ | ​
Due in one year or less | ​ | $ | — | ​ | $ | —
Due after one year through five years | ​ | ​ | — | ​ | ​ | —
Due after five years through ten years | ​ | ​ | 51,856 | ​ | ​ | 48,536
Due after ten years | ​ | ​ | 50,625 | ​ | ​ | 45,241
​ | ​ | ​ | 102,481 | ​ | ​ | 93,777
​ | ​ | ​ | ​ | ​ | ​ | ​
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 39,037 | ​ | ​ | 33,727
Residential - Government-sponsored enterprises | ​ | ​ | 89,907 | ​ | ​ | 77,027
Commercial - Government agency | ​ | ​ | 30,779 | ​ | ​ | 22,639
Commercial - Government-sponsored enterprises | ​ | ​ | 1,100,422 | ​ | ​ | 975,935
Total mortgage-backed securities | ​ | ​ | 1,260,145 | ​ | ​ | 1,109,328
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 863,939 | ​ | ​ | 763,627
Government-sponsored enterprises | ​ | ​ | 1,432,249 | ​ | ​ | 1,263,966
Total collateralized mortgage obligations | ​ | ​ | 2,296,188 | ​ | ​ | 2,027,593
Total held-to-maturity securities | ​ | $ | 3,658,814 | ​ | $ | 3,230,698
Schedule of gross unrealized losses and fair values of securities in a continuous loss position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Time in Continuous Loss as of June 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 | ​ | $ | — | ​ | $ | — | ​ | $ | (1,209) | ​ | $ | 8,540 | ​ | $ | (1,209) | ​ | $ | 8,540
Residential - Government-sponsored enterprises | ​ | ​ | (119) | ​ | ​ | 82,667 | ​ | ​ | (72,534) | ​ | ​ | 594,518 | ​ | ​ | (72,653) | ​ | ​ | 677,185
Commercial - Government agency | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (49,424) | ​ | ​ | 194,010 | ​ | ​ | (49,424) | ​ | ​ | 194,010
Commercial - Government-sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (1,931) | ​ | ​ | 43,913 | ​ | ​ | (1,931) | ​ | ​ | 43,913
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | (123) | ​ | ​ | 46,917 | ​ | ​ | (42,650) | ​ | ​ | 300,687 | ​ | ​ | (42,773) | ​ | ​ | 347,604
Government-sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (40,184) | ​ | ​ | 243,192 | ​ | ​ | (40,184) | ​ | ​ | 243,192
Total available-for-sale securities with unrealized losses | ​ | $ | (242) | ​ | $ | 129,584 | ​ | $ | (207,932) | ​ | $ | 1,384,860 | ​ | $ | (208,174) | ​ | $ | 1,514,444
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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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