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Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2021
Investment Securities |
Schedule of amortized cost and fair value of securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 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 | ​ | $ | 182,354 | ​ | $ | 545 | ​ | $ | (2,127) | ​ | $ | 180,772 | ​ | $ | 170,123 | ​ | $ | 1,359 | ​ | $ | (61) | ​ | $ | 171,421
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 110,115 | ​ | ​ | 3,174 | ​ | ​ | — | ​ | ​ | 113,289 | ​ | ​ | 155,169 | ​ | ​ | 5,293 | ​ | ​ | — | ​ | ​ | 160,462
Residential - Government-sponsored enterprises | ​ | ​ | 1,257,032 | ​ | ​ | 10,776 | ​ | ​ | (4,360) | ​ | ​ | 1,263,448 | ​ | ​ | 434,282 | ​ | ​ | 13,643 | ​ | ​ | (725) | ​ | ​ | 447,200
Commercial - Government agency | ​ | ​ | 487,607 | ​ | ​ | 6,956 | ​ | ​ | (3,116) | ​ | ​ | 491,447 | ​ | ​ | 583,232 | ​ | ​ | 16,537 | ​ | ​ | (119) | ​ | ​ | 599,650
Commercial - Government-sponsored enterprises | ​ | ​ | 1,244,031 | ​ | ​ | 7,116 | ​ | ​ | (27,342) | ​ | ​ | 1,223,805 | ​ | ​ | 931,095 | ​ | ​ | 9,045 | ​ | ​ | (7,983) | ​ | ​ | 932,157
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 1,645,170 | ​ | ​ | 22,631 | ​ | ​ | (5,667) | ​ | ​ | 1,662,134 | ​ | ​ | 1,902,326 | ​ | ​ | 32,246 | ​ | ​ | (1,019) | ​ | ​ | 1,933,553
Government-sponsored enterprises | ​ | ​ | 2,024,844 | ​ | ​ | 11,195 | ​ | ​ | (17,004) | ​ | ​ | 2,019,035 | ​ | ​ | 1,808,804 | ​ | ​ | 18,991 | ​ | ​ | (823) | ​ | ​ | 1,826,972
Total available-for-sale securities | ​ | $ | 6,951,153 | ​ | $ | 62,393 | ​ | $ | (59,616) | ​ | $ | 6,953,930 | ​ | $ | 5,985,031 | ​ | $ | 97,114 | ​ | $ | (10,730) | ​ | $ | 6,071,415
Schedule of amortized cost and fair value of debt securities by contractual maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2021
​ | ​ | Amortized | ​ | Fair
(dollars in thousands) |  | Cost |  | Value
Due in one year or less | ​ | $ | — | ​ | $ | —
Due after one year through five years | ​ | ​ | 41,497 | ​ | ​ | 41,787
Due after five years through ten years | ​ | ​ | 83,608 | ​ | ​ | 82,670
Due after ten years | ​ | ​ | 57,249 | ​ | ​ | 56,315
​ | ​ | ​ | 182,354 | ​ | ​ | 180,772
​ | ​ | ​ | ​ | ​ | ​ | ​
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 110,115 | ​ | ​ | 113,289
Residential - Government-sponsored enterprises | ​ | ​ | 1,257,032 | ​ | ​ | 1,263,448
Commercial - Government agency | ​ | ​ | 487,607 | ​ | ​ | 491,447
Commercial - Government-sponsored enterprises | ​ | ​ | 1,244,031 | ​ | ​ | 1,223,805
Total mortgage-backed securities | ​ | ​ | 3,098,785 | ​ | ​ | 3,091,989
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 1,645,170 | ​ | ​ | 1,662,134
Government-sponsored enterprises | ​ | ​ | 2,024,844 | ​ | ​ | 2,019,035
Total collateralized mortgage obligations | ​ | ​ | 3,670,014 | ​ | ​ | 3,681,169
Total available-for-sale securities | ​ | $ | 6,951,153 | ​ | $ | 6,953,930
Schedule of gross unrealized losses and fair values of securities in a continuous loss position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Time in Continuous Loss as of June 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 | ​ | $ | (2,127) | ​ | $ | 120,987 | ​ | $ | — | ​ | $ | — | ​ | $ | (2,127) | ​ | $ | 120,987
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government-sponsored enterprises | ​ | ​ | (4,360) | ​ | ​ | 618,414 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (4,360) | ​ | ​ | 618,414
Commercial - Government agency | ​ | ​ | (2,899) | ​ | ​ | 193,041 | ​ | ​ | (217) | ​ | ​ | 7,064 | ​ | ​ | (3,116) | ​ | ​ | 200,105
Commercial - Government-sponsored enterprises | ​ | ​ | (27,342) | ​ | ​ | 865,899 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (27,342) | ​ | ​ | 865,899
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | (5,667) | ​ | ​ | 463,392 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (5,667) | ​ | ​ | 463,392
Government-sponsored enterprises | ​ | ​ | (17,004) | ​ | ​ | 1,237,282 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (17,004) | ​ | ​ | 1,237,282
Total available-for-sale securities with unrealized losses | ​ | $ | (59,399) | ​ | $ | 3,499,015 | ​ | $ | (217) | ​ | $ | 7,064 | ​ | $ | (59,616) | ​ | $ | 3,506,079
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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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