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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2021
Investment Securities |
Schedule of amortized cost and fair value of securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2021 | ​ | December 31, 2020
​ | ​ | 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 | ​ | $ | 188,861 | ​ | $ | 552 | ​ | $ | (1,552) | ​ | $ | 187,861 | ​ | $ | 170,123 | ​ | $ | 1,359 | ​ | $ | (61) | ​ | $ | 171,421
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 95,337 | ​ | ​ | 2,797 | ​ | ​ | — | ​ | ​ | 98,134 | ​ | ​ | 155,169 | ​ | ​ | 5,293 | ​ | ​ | — | ​ | ​ | 160,462
Residential - Government-sponsored enterprises | ​ | ​ | 1,455,375 | ​ | ​ | 9,944 | ​ | ​ | (6,441) | ​ | ​ | 1,458,878 | ​ | ​ | 434,282 | ​ | ​ | 13,643 | ​ | ​ | (725) | ​ | ​ | 447,200
Commercial - Government agency | ​ | ​ | 449,147 | ​ | ​ | 4,653 | ​ | ​ | (5,206) | ​ | ​ | 448,594 | ​ | ​ | 583,232 | ​ | ​ | 16,537 | ​ | ​ | (119) | ​ | ​ | 599,650
Commercial - Government-sponsored enterprises | ​ | ​ | 1,337,925 | ​ | ​ | 4,008 | ​ | ​ | (40,684) | ​ | ​ | 1,301,249 | ​ | ​ | 931,095 | ​ | ​ | 9,045 | ​ | ​ | (7,983) | ​ | ​ | 932,157
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 2,053,171 | ​ | ​ | 16,316 | ​ | ​ | (9,623) | ​ | ​ | 2,059,864 | ​ | ​ | 1,902,326 | ​ | ​ | 32,246 | ​ | ​ | (1,019) | ​ | ​ | 1,933,553
Government-sponsored enterprises | ​ | ​ | 2,414,450 | ​ | ​ | 7,506 | ​ | ​ | (22,809) | ​ | ​ | 2,399,147 | ​ | ​ | 1,808,804 | ​ | ​ | 18,991 | ​ | ​ | (823) | ​ | ​ | 1,826,972
Total available-for-sale securities | ​ | $ | 7,994,266 | ​ | $ | 45,776 | ​ | $ | (86,315) | ​ | $ | 7,953,727 | ​ | $ | 5,985,031 | ​ | $ | 97,114 | ​ | $ | (10,730) | ​ | $ | 6,071,415
Schedule of amortized cost and fair value of debt securities by contractual maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2021
​ | ​ | Amortized | ​ | Fair
(dollars in thousands) |  | Cost |  | Value
Due in one year or less | ​ | $ | — | ​ | $ | —
Due after one year through five years | ​ | ​ | 41,481 | ​ | ​ | 41,777
Due after five years through ten years | ​ | ​ | 83,227 | ​ | ​ | 82,733
Due after ten years | ​ | ​ | 64,153 | ​ | ​ | 63,351
​ | ​ | ​ | 188,861 | ​ | ​ | 187,861
​ | ​ | ​ | ​ | ​ | ​ | ​
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 95,337 | ​ | ​ | 98,134
Residential - Government-sponsored enterprises | ​ | ​ | 1,455,375 | ​ | ​ | 1,458,878
Commercial - Government agency | ​ | ​ | 449,147 | ​ | ​ | 448,594
Commercial - Government-sponsored enterprises | ​ | ​ | 1,337,925 | ​ | ​ | 1,301,249
Total mortgage-backed securities | ​ | ​ | 3,337,784 | ​ | ​ | 3,306,855
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 2,053,171 | ​ | ​ | 2,059,864
Government-sponsored enterprises | ​ | ​ | 2,414,450 | ​ | ​ | 2,399,147
Total collateralized mortgage obligations | ​ | ​ | 4,467,621 | ​ | ​ | 4,459,011
Total available-for-sale securities | ​ | $ | 7,994,266 | ​ | $ | 7,953,727
Schedule of gross unrealized losses and fair values of securities in a continuous loss position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Time in Continuous Loss as of September 30, 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 | ​ | $ | (1,552) | ​ | $ | 128,093 | ​ | $ | — | ​ | $ | — | ​ | $ | (1,552) | ​ | $ | 128,093
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government-sponsored enterprises | ​ | ​ | (5,799) | ​ | ​ | 818,313 | ​ | ​ | (642) | ​ | ​ | 20,693 | ​ | ​ | (6,441) | ​ | ​ | 839,006
Commercial - Government agency | ​ | ​ | (4,960) | ​ | ​ | 230,013 | ​ | ​ | (246) | ​ | ​ | 6,901 | ​ | ​ | (5,206) | ​ | ​ | 236,914
Commercial - Government-sponsored enterprises | ​ | ​ | (27,869) | ​ | ​ | 874,759 | ​ | ​ | (12,815) | ​ | ​ | 159,985 | ​ | ​ | (40,684) | ​ | ​ | 1,034,744
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | (9,623) | ​ | ​ | 936,557 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (9,623) | ​ | ​ | 936,557
Government-sponsored enterprises | ​ | ​ | (22,809) | ​ | ​ | 1,611,979 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (22,809) | ​ | ​ | 1,611,979
Total available-for-sale securities with unrealized losses | ​ | $ | (72,612) | ​ | $ | 4,599,714 | ​ | $ | (13,703) | ​ | $ | 187,579 | ​ | $ | (86,315) | ​ | $ | 4,787,293
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Time in Continuous Loss as of December 31, 2020
​ | ​ | 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 | ​ | $ | (61) | ​ | $ | 38,507 | ​ | $ | — | ​ | $ | — | ​ | $ | (61) | ​ | $ | 38,507
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government-sponsored enterprises | ​ | ​ | (725) | ​ | ​ | 64,987 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (725) | ​ | ​ | 64,987
Commercial - Government agency | ​ | ​ | (119) | ​ | ​ | 32,346 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (119) | ​ | ​ | 32,346
Commercial - Government-sponsored enterprises | ​ | ​ | (7,983) | ​ | ​ | 427,759 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (7,983) | ​ | ​ | 427,759
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | (994) | ​ | ​ | 209,124 | ​ | ​ | (25) | ​ | ​ | 6,190 | ​ | ​ | (1,019) | ​ | ​ | 215,314
Government-sponsored enterprises | ​ | ​ | (823) | ​ | ​ | 296,160 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (823) | ​ | ​ | 296,160
Total available-for-sale securities with unrealized losses | ​ | $ | (10,705) | ​ | $ | 1,068,883 | ​ | $ | (25) | ​ | $ | 6,190 | ​ | $ | (10,730) | ​ | $ | 1,075,073

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