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Investment Securities | 3 Months Ended
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Mar. 31, 2025
Investment Securities |
Investment Securities | 2. Investment Securities ​ As of March 31, 2025 and December 31, 2024, investment securities consisted predominantly of the following investment categories: ​ Debt securities – includes debt securities issued by U.S. government agencies. ​ Mortgage-backed securities – includes securities backed by notes or receivables secured by mortgage assets with cash flows based on actual or scheduled payments. ​ Collateralized mortgage obligations – includes securities backed by a pool of mortgages with cash flows distributed based on certain rules rather than pass through payments. ​ Collateralized loan obligations – includes structured debt securities backed by a pool of loans, consisting of primarily non-investment grade broadly syndicated corporate loans with additional credit enhancement. These are floating rate securities that have an investment grade rating of AA or better. ​ Debt securities issued by states and political subdivisions – includes general obligation bonds issued by state and local governments. ​ As of March 31, 2025 and December 31, 2024, the Company’s investment securities were classified as either available-for-sale or held-to-maturity. Amortized cost, gross unrealized holding gains and losses and fair value of available-for-sale and held-to-maturity investment securities as of March 31, 2025 and December 31, 2024 were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
​ Accrued interest receivable related to available-for-sale investment securities was $5.0 million and $5.6 million as of March 31, 2025 and December 31, 2024, respectively. Accrued interest receivable related to held-to-maturity investment securities was $6.8 million and $6.6 million as of March 31, 2025 and December 31, 2024, respectively. Accrued interest receivable is recorded separately from the amortized cost basis of investment securities on the Company’s unaudited interim consolidated balance sheets. ​ Proceeds from calls and sales of investment securities were $40.2 million and nil, respectively, for the three months ended March 31, 2025, and $10.3 million and nil, respectively, for the three months ended March 31, 2024. The Company recorded gross realized gains of nil and gross realized losses of nil for the three months ended March 31, 2025 and 2024. The income tax expense related to the Company’s net realized gain on the sale of investment securities was nil for the three months ended March 31, 2025 and 2024. Gains and losses realized on sales of securities are determined using the specific identification method. ​ Interest income from taxable investment securities was $26.7 million and $29.1 million, respectively, for the three months ended March 31, 2025 and 2024. Interest income from non-taxable investment securities was $3.1 million and $3.2 million, respectively, for the three months ended March 31, 2025 and 2024. ​ The amortized cost and fair value of debt securities issued by government agencies and states and political subdivisions, non-agency mortgage-backed securities and collateralized loan obligations as of March 31, 2025, by contractual maturity, are shown below. Mortgage-backed securities and collateralized mortgage obligations issued by government agencies and government-sponsored enterprises are disclosed separately in the table below as remaining expected maturities will differ from contractual maturities as borrowers have the right to prepay obligations. ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
​ At March 31, 2025, pledged securities totaled $4.2 billion, of which $2.3 billion was pledged to secure borrowing capacity, $1.9 billion was pledged to secure public deposits and $20.1 million was pledged to secure other financial transactions. At December 31, 2024, pledged securities totaled $3.8 billion, of which $2.1 billion was pledged to secure borrowing capacity, $1.7 billion was pledged to secure public deposits and $19.3 million was pledged to secure other financial transactions. ​ The Company held no securities of any single issuer, other than debt securities issued by government agencies and government-sponsored enterprises, which were in excess of 10% of stockholders’ equity as of March 31, 2025 and December 31, 2024. ​ The following tables present the unrealized gross losses and fair values of securities in the available-for-sale portfolio by length of time that the 154 and 159 individual securities in each category have been in a continuous loss position as of March 31, 2025 and December 31, 2024, respectively. The unrealized losses on available-for-sale investment securities were attributable to changes in interest rates, relative to when the investment securities were purchased, and not due to the credit quality of the investment securities. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
​ At March 31, 2025 and December 31, 2024, the Company did not have any available-for-sale securities with the intent to sell and determined it was more likely than not that the Company would not be required to sell the securities prior to recovery of the amortized cost basis. As the Company had the intent and ability to hold the remaining available-for-sale securities in an unrealized loss position as of March 31, 2025 and December 31, 2024, each security with an unrealized loss position in the above tables has been further assessed to determine if a credit loss exists. As of March 31, 2025 and December 31, 2024, the Company did not expect any credit losses in its available-for-sale debt securities and no credit losses were recognized on available-for-sale securities during the three months ended March 31, 2025 and for the year ended December 31, 2024. ​ As of March 31, 2025 and December 31, 2024, the Company’s investment securities were comprised primarily of debt securities, mortgage-backed securities and collateralized mortgage obligations issued by U.S. government agencies and government-sponsored enterprises, with under 4% of the investment securities comprised of collateralized loan obligations rated AA or better and obligations issued by local state and political subdivisions rated AA or better. For investment securities issued by the U.S. Government, its agencies and government-sponsored enterprises, management has concluded that the long history with no credit losses from these issuers indicates an expectation that nonpayment of the amortized cost basis is zero, and these securities are explicitly or implicitly fully guaranteed by the U.S. government. The U.S. government can print its own currency and its currency is routinely held by central banks and other major financial institutions. The dollar is used in international commerce, and commonly is viewed as a reserve currency, all of which qualitatively indicates that historical credit loss information should be minimally affected by current conditions and reasonable and supportable forecasts. For collateralized loan obligations and debt securities issued by local state and political subdivisions, these securities are investment grade and highly rated and carry either sufficient credit enhancement or days cash on hand to support timely payments of principal and interest. As a result, the Company does not expect any future payment defaults and has not recorded an allowance for credit losses for its available-for-sale and held-to-maturity debt securities as of March 31, 2025 or December 31, 2024.

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- Definition The entire disclosure for investment holdings. This includes the long positions of investments for the entity. It contains investments in affiliated and unaffiliated issuers. The investments include securities and non securities (i.e. commodities and futures contracts). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 210 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478795/946-210-50-12 + Details
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