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v3.22.2.2

Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2022
Investment Securities |
Schedule of amortized cost and fair value of securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2022 | ​ | December 31, 2021
​ | ​ | 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 | ​ | $ | 165,713 | ​ | $ | — | ​ | $ | (13,191) | ​ | $ | 152,522 | ​ | $ | 196,662 | ​ | $ | 125 | ​ | $ | (4,224) | ​ | $ | 192,563
Government-sponsored enterprises debt securities | ​ | ​ | 45,000 | ​ | ​ | — | ​ | ​ | (674) | ​ | ​ | 44,326 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 68,969 | ​ | ​ | — | ​ | ​ | (7,335) | ​ | ​ | 61,634 | ​ | ​ | 135,764 | ​ | ​ | 1,791 | ​ | ​ | (291) | ​ | ​ | 137,264
Residential - Government-sponsored enterprises | ​ | ​ | 1,366,912 | ​ | ​ | — | ​ | ​ | (169,071) | ​ | ​ | 1,197,841 | ​ | ​ | 1,496,605 | ​ | ​ | 6,914 | ​ | ​ | (12,419) | ​ | ​ | 1,491,100
Commercial - Government agency | ​ | ​ | 290,614 | ​ | ​ | — | ​ | ​ | (39,949) | ​ | ​ | 250,665 | ​ | ​ | 392,443 | ​ | ​ | 1,741 | ​ | ​ | (6,521) | ​ | ​ | 387,663
Commercial - Government-sponsored enterprises | ​ | ​ | 142,053 | ​ | ​ | — | ​ | ​ | (10,732) | ​ | ​ | 131,321 | ​ | ​ | 1,415,511 | ​ | ​ | 2,646 | ​ | ​ | (48,714) | ​ | ​ | 1,369,443
Commercial - Non-agency | ​ | ​ | 21,960 | ​ | ​ | — | ​ | ​ | (290) | ​ | ​ | 21,670 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 769,161 | ​ | ​ | — | ​ | ​ | (74,948) | ​ | ​ | 694,213 | ​ | ​ | 2,103,187 | ​ | ​ | 7,768 | ​ | ​ | (31,432) | ​ | ​ | 2,079,523
Government-sponsored enterprises | ​ | ​ | 553,090 | ​ | ​ | — | ​ | ​ | (63,642) | ​ | ​ | 489,448 | ​ | ​ | 2,671,131 | ​ | ​ | 3,608 | ​ | ​ | (53,695) | ​ | ​ | 2,621,044
Collateralized loan obligations | ​ | ​ | 249,924 | ​ | ​ | 51 | ​ | ​ | (4,455) | ​ | ​ | 245,520 | ​ | ​ | 105,245 | ​ | ​ | 2 | ​ | ​ | — | ​ | ​ | 105,247
Debt securities issued by states and political subdivisions | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 44,185 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 44,185
Total available-for-sale securities | ​ | $ | 3,673,396 | ​ | $ | 51 | ​ | $ | (384,287) | ​ | $ | 3,289,160 | ​ | $ | 8,560,733 | ​ | $ | 24,595 | ​ | $ | (157,296) | ​ | $ | 8,428,032
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency debt securities | ​ | $ | 55,069 | ​ | $ | — | ​ | $ | (5,579) | ​ | $ | 49,490 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 46,695 | ​ | ​ | — | ​ | ​ | (5,228) | ​ | ​ | 41,467 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Residential - Government-sponsored enterprises | ​ | ​ | 108,145 | ​ | ​ | — | ​ | ​ | (11,927) | ​ | ​ | 96,218 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Commercial - Government agency | ​ | ​ | 30,500 | ​ | ​ | — | ​ | ​ | (4,784) | ​ | ​ | 25,716 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Commercial - Government-sponsored enterprises | ​ | ​ | 1,159,512 | ​ | ​ | — | ​ | ​ | (135,284) | ​ | ​ | 1,024,228 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 1,106,231 | ​ | ​ | — | ​ | ​ | (97,089) | ​ | ​ | 1,009,142 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Government-sponsored enterprises | ​ | ​ | 1,846,258 | ​ | ​ | — | ​ | ​ | (178,011) | ​ | ​ | 1,668,247 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Debt securities issued by states and political subdivisions | ​ | ​ | 53,733 | ​ | ​ | — | ​ | ​ | (7,528) | ​ | ​ | 46,205 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Total held-to-maturity securities | ​ | $ | 4,406,143 | ​ | $ | — | ​ | $ | (445,430) | ​ | $ | 3,960,713 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Schedule of amortized cost and fair value of debt securities by contractual maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2022
​ | ​ | Amortized | ​ | Fair
(dollars in thousands) |  | Cost |  | Value
Available-for-sale securities | ​ | ​ | ​ | ​ | ​ | ​
Due in one year or less | ​ | $ | 55,063 | ​ | $ | 54,493
Due after one year through five years | ​ | ​ | 80,038 | ​ | ​ | 76,346
Due after five years through ten years | ​ | ​ | 182,578 | ​ | ​ | 172,565
Due after ten years | ​ | ​ | 164,918 | ​ | ​ | 160,634
​ | ​ | ​ | 482,597 | ​ | ​ | 464,038
​ | ​ | ​ | ​ | ​ | ​ | ​
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 68,969 | ​ | ​ | 61,634
Residential - Government-sponsored enterprises | ​ | ​ | 1,366,912 | ​ | ​ | 1,197,841
Commercial - Government agency | ​ | ​ | 290,614 | ​ | ​ | 250,665
Commercial - Government-sponsored enterprises | ​ | ​ | 142,053 | ​ | ​ | 131,321
Total mortgage-backed securities | ​ | ​ | 1,868,548 | ​ | ​ | 1,641,461
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 769,161 | ​ | ​ | 694,213
Government-sponsored enterprises | ​ | ​ | 553,090 | ​ | ​ | 489,448
Total collateralized mortgage obligations | ​ | ​ | 1,322,251 | ​ | ​ | 1,183,661
Total available-for-sale securities | ​ | $ | 3,673,396 | ​ | $ | 3,289,160
​ | ​ | ​ | ​ | ​ | ​ | ​
Held-to-maturity securities | ​ | ​ | ​ | ​ | ​ | ​
Due in one year or less | ​ | $ | — | ​ | $ | —
Due after one year through five years | ​ | ​ | — | ​ | ​ | —
Due after five years through ten years | ​ | ​ | — | ​ | ​ | —
Due after ten years | ​ | ​ | 108,802 | ​ | ​ | 95,695
​ | ​ | ​ | 108,802 | ​ | ​ | 95,695
​ | ​ | ​ | ​ | ​ | ​ | ​
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 46,695 | ​ | ​ | 41,467
Residential - Government-sponsored enterprises | ​ | ​ | 108,145 | ​ | ​ | 96,218
Commercial - Government agency | ​ | ​ | 30,500 | ​ | ​ | 25,716
Commercial - Government-sponsored enterprises | ​ | ​ | 1,159,512 | ​ | ​ | 1,024,228
Total mortgage-backed securities | ​ | ​ | 1,344,852 | ​ | ​ | 1,187,629
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 1,106,231 | ​ | ​ | 1,009,142
Government-sponsored enterprises | ​ | ​ | 1,846,258 | ​ | ​ | 1,668,247
Total collateralized mortgage obligations | ​ | ​ | 2,952,489 | ​ | ​ | 2,677,389
Total held-to-maturity securities | ​ | $ | 4,406,143 | ​ | $ | 3,960,713
Schedule of gross unrealized losses and fair values of securities in a continuous loss position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Time in Continuous Loss as of September 30, 2022
​ | ​ | 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 | ​ | $ | (3,200) | ​ | $ | 83,558 | ​ | $ | (9,991) | ​ | $ | 68,964 | ​ | $ | (13,191) | ​ | $ | 152,522
Government-sponsored enterprises debt securities | ​ | ​ | (674) | ​ | ​ | 44,326 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (674) | ​ | ​ | 44,326
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | (7,335) | ​ | ​ | 61,634 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (7,335) | ​ | ​ | 61,634
Residential - Government-sponsored enterprises | ​ | ​ | (134,845) | ​ | ​ | 994,823 | ​ | ​ | (34,226) | ​ | ​ | 203,018 | ​ | ​ | (169,071) | ​ | ​ | 1,197,841
Commercial - Government agency | ​ | ​ | (13,928) | ​ | ​ | 117,444 | ​ | ​ | (26,021) | ​ | ​ | 133,221 | ​ | ​ | (39,949) | ​ | ​ | 250,665
Commercial - Government-sponsored enterprises | ​ | ​ | (7,080) | ​ | ​ | 106,268 | ​ | ​ | (3,652) | ​ | ​ | 25,053 | ​ | ​ | (10,732) | ​ | ​ | 131,321
Commercial - Non-agency | ​ | ​ | (290) | ​ | ​ | 21,670 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (290) | ​ | ​ | 21,670
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | (74,722) | ​ | ​ | 691,942 | ​ | ​ | (226) | ​ | ​ | 2,271 | ​ | ​ | (74,948) | ​ | ​ | 694,213
Government-sponsored enterprises | ​ | ​ | (25,190) | ​ | ​ | 258,825 | ​ | ​ | (38,452) | ​ | ​ | 230,623 | ​ | ​ | (63,642) | ​ | ​ | 489,448
Collateralized loan obligations: | ​ | ​ | (4,455) | ​ | ​ | 169,242 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (4,455) | ​ | ​ | 169,242
Total available-for-sale securities with unrealized losses | ​ | $ | (271,719) | ​ | $ | 2,549,732 | ​ | $ | (112,568) | ​ | $ | 663,150 | ​ | $ | (384,287) | ​ | $ | 3,212,882
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Time in Continuous Loss as of December 31, 2021
​ | ​ | 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 | ​ | $ | (3,355) | ​ | $ | 134,468 | ​ | $ | (869) | ​ | $ | 16,642 | ​ | $ | (4,224) | ​ | $ | 151,110
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | (291) | ​ | ​ | 51,231 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (291) | ​ | ​ | 51,231
Residential - Government-sponsored enterprises | ​ | ​ | (10,876) | ​ | ​ | 1,230,104 | ​ | ​ | (1,543) | ​ | ​ | 32,415 | ​ | ​ | (12,419) | ​ | ​ | 1,262,519
Commercial - Government agency | ​ | ​ | (5,239) | ​ | ​ | 186,024 | ​ | ​ | (1,282) | ​ | ​ | 26,063 | ​ | ​ | (6,521) | ​ | ​ | 212,087
Commercial - Government-sponsored enterprises | ​ | ​ | (22,179) | ​ | ​ | 744,819 | ​ | ​ | (26,535) | ​ | ​ | 397,123 | ​ | ​ | (48,714) | ​ | ​ | 1,141,942
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | (31,432) | ​ | ​ | 1,441,848 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (31,432) | ​ | ​ | 1,441,848
Government-sponsored enterprises | ​ | ​ | (52,551) | ​ | ​ | 2,255,535 | ​ | ​ | (1,144) | ​ | ​ | 24,959 | ​ | ​ | (53,695) | ​ | ​ | 2,280,494
Total available-for-sale securities with unrealized losses | ​ | $ | (125,923) | ​ | $ | 6,044,029 | ​ | $ | (31,373) | ​ | $ | 497,202 | ​ | $ | (157,296) | ​ | $ | 6,541,231

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