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Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2022
Investment Securities |
Schedule of amortized cost and fair value of securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 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 | ​ | $ | 168,129 | ​ | $ | — | ​ | $ | (8,964) | ​ | $ | 159,165 | ​ | $ | 196,662 | ​ | $ | 125 | ​ | $ | (4,224) | ​ | $ | 192,563
Government-sponsored enterprises debt securities | ​ | ​ | 20,000 | ​ | ​ | — | ​ | ​ | (37) | ​ | ​ | 19,963 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 72,027 | ​ | ​ | — | ​ | ​ | (4,069) | ​ | ​ | 67,958 | ​ | ​ | 135,764 | ​ | ​ | 1,791 | ​ | ​ | (291) | ​ | ​ | 137,264
Residential - Government-sponsored enterprises | ​ | ​ | 1,444,461 | ​ | ​ | 24 | ​ | ​ | (111,470) | ​ | ​ | 1,333,015 | ​ | ​ | 1,496,605 | ​ | ​ | 6,914 | ​ | ​ | (12,419) | ​ | ​ | 1,491,100
Commercial - Government agency | ​ | ​ | 297,271 | ​ | ​ | — | ​ | ​ | (29,614) | ​ | ​ | 267,657 | ​ | ​ | 392,443 | ​ | ​ | 1,741 | ​ | ​ | (6,521) | ​ | ​ | 387,663
Commercial - Government-sponsored enterprises | ​ | ​ | 147,160 | ​ | ​ | 918 | ​ | ​ | (6,242) | ​ | ​ | 141,836 | ​ | ​ | 1,415,511 | ​ | ​ | 2,646 | ​ | ​ | (48,714) | ​ | ​ | 1,369,443
Commercial - Non-agency | ​ | ​ | 21,957 | ​ | ​ | — | ​ | ​ | (407) | ​ | ​ | 21,550 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 1,102,277 | ​ | ​ | — | ​ | ​ | (76,938) | ​ | ​ | 1,025,339 | ​ | ​ | 2,103,187 | ​ | ​ | 7,768 | ​ | ​ | (31,432) | ​ | ​ | 2,079,523
Government-sponsored enterprises | ​ | ​ | 744,622 | ​ | ​ | — | ​ | ​ | (60,062) | ​ | ​ | 684,560 | ​ | ​ | 2,671,131 | ​ | ​ | 3,608 | ​ | ​ | (53,695) | ​ | ​ | 2,621,044
Collateralized loan obligations | ​ | ​ | 249,905 | ​ | ​ | 45 | ​ | ​ | (3,247) | ​ | ​ | 246,703 | ​ | ​ | 105,245 | ​ | ​ | 2 | ​ | ​ | — | ​ | ​ | 105,247
Debt securities issued by states and political subdivisions | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 44,185 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 44,185
Total available-for-sale securities | ​ | $ | 4,267,809 | ​ | $ | 987 | ​ | $ | (301,050) | ​ | $ | 3,967,746 | ​ | $ | 8,560,733 | ​ | $ | 24,595 | ​ | $ | (157,296) | ​ | $ | 8,428,032
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency debt securities | ​ | $ | 55,148 | ​ | $ | — | ​ | $ | (2,405) | ​ | $ | 52,743 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 47,309 | ​ | ​ | — | ​ | ​ | (3,031) | ​ | ​ | 44,278 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Residential - Government-sponsored enterprises | ​ | ​ | 93,458 | ​ | ​ | — | ​ | ​ | (6,117) | ​ | ​ | 87,341 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Commercial - Government agency | ​ | ​ | 30,497 | ​ | ​ | — | ​ | ​ | (2,685) | ​ | ​ | 27,812 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Commercial - Government-sponsored enterprises | ​ | ​ | 1,173,398 | ​ | ​ | — | ​ | ​ | (63,627) | ​ | ​ | 1,109,771 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 879,010 | ​ | ​ | — | ​ | ​ | (31,243) | ​ | ​ | 847,767 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Government-sponsored enterprises | ​ | ​ | 1,760,755 | ​ | ​ | — | ​ | ​ | (69,483) | ​ | ​ | 1,691,272 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Debt securities issued by states and political subdivisions | ​ | ​ | 53,640 | ​ | ​ | — | ​ | ​ | (3,844) | ​ | ​ | 49,796 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Total held-to-maturity securities | ​ | $ | 4,093,215 | ​ | $ | — | ​ | $ | (182,435) | ​ | $ | 3,910,780 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Schedule of amortized cost and fair value of debt securities by contractual maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2022
​ | ​ | Amortized | ​ | Fair
(dollars in thousands) |  | Cost |  | Value
Due in one year or less | ​ | $ | 30,106 | ​ | $ | 29,762
Due after one year through five years | ​ | ​ | 79,915 | ​ | ​ | 77,983
Due after five years through ten years | ​ | ​ | 177,556 | ​ | ​ | 170,656
Due after ten years | ​ | ​ | 172,414 | ​ | ​ | 168,980
​ | ​ | ​ | 459,991 | ​ | ​ | 447,381
​ | ​ | ​ | ​ | ​ | ​ | ​
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 72,027 | ​ | ​ | 67,958
Residential - Government-sponsored enterprises | ​ | ​ | 1,444,461 | ​ | ​ | 1,333,015
Commercial - Government agency | ​ | ​ | 297,271 | ​ | ​ | 267,657
Commercial - Government-sponsored enterprises | ​ | ​ | 147,160 | ​ | ​ | 141,836
Total mortgage-backed securities | ​ | ​ | 1,960,919 | ​ | ​ | 1,810,466
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 1,102,277 | ​ | ​ | 1,025,339
Government-sponsored enterprises | ​ | ​ | 744,622 | ​ | ​ | 684,560
Total collateralized mortgage obligations | ​ | ​ | 1,846,899 | ​ | ​ | 1,709,899
Total available-for-sale securities | ​ | $ | 4,267,809 | ​ | $ | 3,967,746
​ | ​ | ​ | ​ | ​ | ​ | ​
Due in one year or less | ​ | $ | — | ​ | $ | —
Due after one year through five years | ​ | ​ | — | ​ | ​ | —
Due after five years through ten years | ​ | ​ | — | ​ | ​ | —
Due after ten years | ​ | ​ | 108,788 | ​ | ​ | 102,539
​ | ​ | ​ | 108,788 | ​ | ​ | 102,539
​ | ​ | ​ | ​ | ​ | ​ | ​
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 47,309 | ​ | ​ | 44,278
Residential - Government-sponsored enterprises | ​ | ​ | 93,458 | ​ | ​ | 87,341
Commercial - Government agency | ​ | ​ | 30,497 | ​ | ​ | 27,812
Commercial - Government-sponsored enterprises | ​ | ​ | 1,173,398 | ​ | ​ | 1,109,771
Total mortgage-backed securities | ​ | ​ | 1,344,662 | ​ | ​ | 1,269,202
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 879,010 | ​ | ​ | 847,767
Government-sponsored enterprises | ​ | ​ | 1,760,755 | ​ | ​ | 1,691,272
Total collateralized mortgage obligations | ​ | ​ | 2,639,765 | ​ | ​ | 2,539,039
Total held-to-maturity securities | ​ | $ | 4,093,215 | ​ | $ | 3,910,780
Schedule of gross unrealized losses and fair values of securities in a continuous loss position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Time in Continuous Loss as of June 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 | ​ | $ | (2,239) | ​ | $ | 87,782 | ​ | $ | (6,725) | ​ | $ | 71,383 | ​ | $ | (8,964) | ​ | $ | 159,165
Government-sponsored enterprises debt securities | ​ | ​ | (37) | ​ | ​ | 19,964 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (37) | ​ | ​ | 19,964
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | (4,069) | ​ | ​ | 67,958 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (4,069) | ​ | ​ | 67,958
Residential - Government-sponsored enterprises | ​ | ​ | (110,301) | ​ | ​ | 1,303,823 | ​ | ​ | (1,169) | ​ | ​ | 9,196 | ​ | ​ | (111,470) | ​ | ​ | 1,313,019
Commercial - Government agency | ​ | ​ | (12,813) | ​ | ​ | 150,595 | ​ | ​ | (16,801) | ​ | ​ | 116,854 | ​ | ​ | (29,614) | ​ | ​ | 267,449
Commercial - Government-sponsored enterprises | ​ | ​ | (4,482) | ​ | ​ | 77,564 | ​ | ​ | (1,760) | ​ | ​ | 18,478 | ​ | ​ | (6,242) | ​ | ​ | 96,042
Commercial - Non-agency | ​ | ​ | (407) | ​ | ​ | 21,550 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (407) | ​ | ​ | 21,550
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | (74,997) | ​ | ​ | 988,818 | ​ | ​ | (1,941) | ​ | ​ | 16,549 | ​ | ​ | (76,938) | ​ | ​ | 1,005,367
Government-sponsored enterprises | ​ | ​ | (41,157) | ​ | ​ | 517,636 | ​ | ​ | (18,905) | ​ | ​ | 166,924 | ​ | ​ | (60,062) | ​ | ​ | 684,560
Collateralized loan obligations: | ​ | ​ | (3,247) | ​ | ​ | 170,425 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (3,247) | ​ | ​ | 170,425
Total available-for-sale securities with unrealized losses | ​ | $ | (253,749) | ​ | $ | 3,406,115 | ​ | $ | (47,301) | ​ | $ | 399,384 | ​ | $ | (301,050) | ​ | $ | 3,805,499
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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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