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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2024
Investment Securities |
Schedule of amortized cost and fair value of securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2024 | ​ | 2023
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
(dollars in thousands) |  | Cost |  | Gains |  | Losses |  | Value |  | Cost |  | Gains |  | Losses |  | Value
U.S. Treasury and government agency debt securities | ​ | $ | 8,170 | ​ | $ | — | ​ | $ | (23) | ​ | $ | 8,147 | ​ | $ | 33,169 | ​ | $ | — | ​ | $ | (666) | ​ | $ | 32,503
Government-sponsored enterprises debt securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 20,000 | ​ | ​ | — | ​ | ​ | (408) | ​ | ​ | 19,592
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 37,473 | ​ | ​ | — | ​ | ​ | (1,614) | ​ | ​ | 35,859 | ​ | ​ | 11,303 | ​ | ​ | — | ​ | ​ | (1,121) | ​ | ​ | 10,182
Residential - Government-sponsored enterprises | ​ | ​ | 840,836 | ​ | ​ | — | ​ | ​ | (102,723) | ​ | ​ | 738,113 | ​ | ​ | 895,421 | ​ | ​ | — | ​ | ​ | (112,124) | ​ | ​ | 783,297
Commercial - Government agency | ​ | ​ | 249,348 | ​ | ​ | — | ​ | ​ | (53,223) | ​ | ​ | 196,125 | ​ | ​ | 268,944 | ​ | ​ | — | ​ | ​ | (50,270) | ​ | ​ | 218,674
Commercial - Government-sponsored enterprises | ​ | ​ | 48,015 | ​ | ​ | — | ​ | ​ | (3,107) | ​ | ​ | 44,908 | ​ | ​ | 93,459 | ​ | ​ | — | ​ | ​ | (7,028) | ​ | ​ | 86,431
Commercial - Non-agency | ​ | ​ | 22,000 | ​ | ​ | 83 | ​ | ​ | — | ​ | ​ | 22,083 | ​ | ​ | 21,964 | ​ | ​ | — | ​ | ​ | (281) | ​ | ​ | 21,683
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 452,038 | ​ | ​ | — | ​ | ​ | (54,914) | ​ | ​ | 397,124 | ​ | ​ | 538,718 | ​ | ​ | — | ​ | ​ | (67,568) | ​ | ​ | 471,150
Government-sponsored enterprises | ​ | ​ | 359,416 | ​ | ​ | — | ​ | ​ | (48,734) | ​ | ​ | 310,682 | ​ | ​ | 425,826 | ​ | ​ | — | ​ | ​ | (61,856) | ​ | ​ | 363,970
Collateralized loan obligations | ​ | ​ | 173,152 | ​ | ​ | 323 | ​ | ​ | — | ​ | ​ | 173,475 | ​ | ​ | 249,871 | ​ | ​ | 43 | ​ | ​ | (2,060) | ​ | ​ | 247,854
Total available-for-sale securities | ​ | $ | 2,190,448 | ​ | $ | 406 | ​ | $ | (264,338) | ​ | $ | 1,926,516 | ​ | $ | 2,558,675 | ​ | $ | 43 | ​ | $ | (303,382) | ​ | $ | 2,255,336
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency debt securities | ​ | $ | 49,267 | ​ | $ | — | ​ | $ | (5,398) | ​ | $ | 43,869 | ​ | $ | 52,051 | ​ | $ | — | ​ | $ | (4,497) | ​ | $ | 47,554
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 40,888 | ​ | ​ | — | ​ | ​ | (6,579) | ​ | ​ | 34,309 | ​ | ​ | 43,885 | ​ | ​ | — | ​ | ​ | (5,189) | ​ | ​ | 38,696
Residential - Government-sponsored enterprises | ​ | ​ | 92,573 | ​ | ​ | — | ​ | ​ | (14,854) | ​ | ​ | 77,719 | ​ | ​ | 99,379 | ​ | ​ | — | ​ | ​ | (11,013) | ​ | ​ | 88,366
Commercial - Government agency | ​ | ​ | 31,009 | ​ | ​ | — | ​ | ​ | (8,666) | ​ | ​ | 22,343 | ​ | ​ | 30,795 | ​ | ​ | — | ​ | ​ | (7,017) | ​ | ​ | 23,778
Commercial - Government-sponsored enterprises | ​ | ​ | 1,114,549 | ​ | ​ | 201 | ​ | ​ | (149,244) | ​ | ​ | 965,506 | ​ | ​ | 1,129,738 | ​ | ​ | 195 | ​ | ​ | (130,757) | ​ | ​ | 999,176
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 907,565 | ​ | ​ | — | ​ | ​ | (126,020) | ​ | ​ | 781,545 | ​ | ​ | 989,130 | ​ | ​ | — | ​ | ​ | (109,471) | ​ | ​ | 879,659
Government-sponsored enterprises | ​ | ​ | 1,500,212 | ​ | ​ | — | ​ | ​ | (210,721) | ​ | ​ | 1,289,491 | ​ | ​ | 1,642,274 | ​ | ​ | — | ​ | ​ | (193,897) | ​ | ​ | 1,448,377
Debt securities issued by states and political subdivisions | ​ | ​ | 54,587 | ​ | ​ | — | ​ | ​ | (6,860) | ​ | ​ | 47,727 | ​ | ​ | 54,197 | ​ | ​ | — | ​ | ​ | (4,947) | ​ | ​ | 49,250
Total held-to-maturity securities | ​ | $ | 3,790,650 | ​ | $ | 201 | ​ | $ | (528,342) | ​ | $ | 3,262,509 | ​ | $ | 4,041,449 | ​ | $ | 195 | ​ | $ | (466,788) | ​ | $ | 3,574,856
Schedule of amortized cost and fair value of debt securities by contractual maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2024
​ | ​ | Amortized | ​ | Fair
(dollars in thousands) |  | Cost |  | Value
Available-for-sale securities | ​ | ​ | ​ | ​ | ​ | ​
Due in one year or less | ​ | $ | 8,170 | ​ | $ | 8,147
Due after one year through five years | ​ | ​ | 9,275 | ​ | ​ | 9,296
Due after five years through ten years | ​ | ​ | 146,351 | ​ | ​ | 146,596
Due after ten years | ​ | ​ | 39,526 | ​ | ​ | 39,666
​ | ​ | ​ | 203,322 | ​ | ​ | 203,705
​ | ​ | ​ | ​ | ​ | ​ | ​
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 37,473 | ​ | ​ | 35,859
Residential - Government-sponsored enterprises | ​ | ​ | 840,836 | ​ | ​ | 738,113
Commercial - Government agency | ​ | ​ | 249,348 | ​ | ​ | 196,125
Commercial - Government-sponsored enterprises | ​ | ​ | 48,015 | ​ | ​ | 44,908
Total mortgage-backed securities | ​ | ​ | 1,175,672 | ​ | ​ | 1,015,005
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 452,038 | ​ | ​ | 397,124
Government-sponsored enterprises | ​ | ​ | 359,416 | ​ | ​ | 310,682
Total collateralized mortgage obligations | ​ | ​ | 811,454 | ​ | ​ | 707,806
Total available-for-sale securities | ​ | $ | 2,190,448 | ​ | $ | 1,926,516
​ | ​ | ​ | ​ | ​ | ​ | ​
Held-to-maturity securities | ​ | ​ | ​ | ​ | ​ | ​
Due in one year or less | ​ | $ | — | ​ | $ | —
Due after one year through five years | ​ | ​ | — | ​ | ​ | —
Due after five years through ten years | ​ | ​ | 52,531 | ​ | ​ | 47,264
Due after ten years | ​ | ​ | 51,323 | ​ | ​ | 44,332
​ | ​ | ​ | 103,854 | ​ | ​ | 91,596
​ | ​ | ​ | ​ | ​ | ​ | ​
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 40,888 | ​ | ​ | 34,309
Residential - Government-sponsored enterprises | ​ | ​ | 92,573 | ​ | ​ | 77,719
Commercial - Government agency | ​ | ​ | 31,009 | ​ | ​ | 22,343
Commercial - Government-sponsored enterprises | ​ | ​ | 1,114,549 | ​ | ​ | 965,506
Total mortgage-backed securities | ​ | ​ | 1,279,019 | ​ | ​ | 1,099,877
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 907,565 | ​ | ​ | 781,545
Government-sponsored enterprises | ​ | ​ | 1,500,212 | ​ | ​ | 1,289,491
Total collateralized mortgage obligations | ​ | ​ | 2,407,777 | ​ | ​ | 2,071,036
Total held-to-maturity securities | ​ | $ | 3,790,650 | ​ | $ | 3,262,509
Schedule of gross unrealized losses and fair values of securities in a continuous loss position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
U.S. Treasury and 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
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Time in Continuous Loss as of December 31, 2023
​ | ​ | Less Than 12 Months | ​ | 12 Months or More | ​ | Total
​ | ​ | Unrealized | ​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​ | ​ | Unrealized | ​ | ​ | ​
(dollars in thousands) |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value
U.S. Treasury and government agency debt securities | ​ | $ | — | ​ | $ | — | ​ | $ | (666) | ​ | $ | 32,503 | ​ | $ | (666) | ​ | $ | 32,503
Government-sponsored enterprises debt securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (408) | ​ | ​ | 19,592 | ​ | ​ | (408) | ​ | ​ | 19,592
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (1,121) | ​ | ​ | 10,182 | ​ | ​ | (1,121) | ​ | ​ | 10,182
Residential - Government-sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (112,124) | ​ | ​ | 783,297 | ​ | ​ | (112,124) | ​ | ​ | 783,297
Commercial - Government agency | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (50,270) | ​ | ​ | 218,674 | ​ | ​ | (50,270) | ​ | ​ | 218,674
Commercial - Government-sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (7,028) | ​ | ​ | 86,431 | ​ | ​ | (7,028) | ​ | ​ | 86,431
Commercial - Non-agency | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (281) | ​ | ​ | 21,683 | ​ | ​ | (281) | ​ | ​ | 21,683
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (67,568) | ​ | ​ | 471,150 | ​ | ​ | (67,568) | ​ | ​ | 471,150
Government-sponsored enterprises | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (61,856) | ​ | ​ | 363,970 | ​ | ​ | (61,856) | ​ | ​ | 363,970
Collateralized loan obligations | ​ | ​ | (564) | ​ | ​ | 63,667 | ​ | ​ | (1,496) | ​ | ​ | 163,126 | ​ | ​ | (2,060) | ​ | ​ | 226,793
Total available-for-sale securities with unrealized losses | ​ | $ | (564) | ​ | $ | 63,667 | ​ | $ | (302,818) | ​ | $ | 2,170,608 | ​ | $ | (303,382) | ​ | $ | 2,234,275

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