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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2022
Investment Securities |
Schedule of amortized cost and fair value of securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 2022 | ​ | 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 | ​ | $ | 163,309 | ​ | $ | — | ​ | $ | (12,327) | ​ | $ | 150,982 | ​ | $ | 196,662 | ​ | $ | 125 | ​ | $ | (4,224) | ​ | $ | 192,563
Government-sponsored enterprises debt securities | ​ | ​ | 45,000 | ​ | ​ | — | ​ | ​ | (699) | ​ | ​ | 44,301 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 66,792 | ​ | ​ | — | ​ | ​ | (7,069) | ​ | ​ | 59,723 | ​ | ​ | 135,764 | ​ | ​ | 1,791 | ​ | ​ | (291) | ​ | ​ | 137,264
Residential - Government-sponsored enterprises | ​ | ​ | 1,317,718 | ​ | ​ | — | ​ | ​ | (157,263) | ​ | ​ | 1,160,455 | ​ | ​ | 1,496,605 | ​ | ​ | 6,914 | ​ | ​ | (12,419) | ​ | ​ | 1,491,100
Commercial - Government agency | ​ | ​ | 282,700 | ​ | ​ | — | ​ | ​ | (44,847) | ​ | ​ | 237,853 | ​ | ​ | 392,443 | ​ | ​ | 1,741 | ​ | ​ | (6,521) | ​ | ​ | 387,663
Commercial - Government-sponsored enterprises | ​ | ​ | 130,612 | ​ | ​ | — | ​ | ​ | (11,039) | ​ | ​ | 119,573 | ​ | ​ | 1,415,511 | ​ | ​ | 2,646 | ​ | ​ | (48,714) | ​ | ​ | 1,369,443
Commercial - Non-agency | ​ | ​ | 21,964 | ​ | ​ | — | ​ | ​ | (493) | ​ | ​ | 21,471 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 738,524 | ​ | ​ | — | ​ | ​ | (85,202) | ​ | ​ | 653,322 | ​ | ​ | 2,103,187 | ​ | ​ | 7,768 | ​ | ​ | (31,432) | ​ | ​ | 2,079,523
Government-sponsored enterprises | ​ | ​ | 533,103 | ​ | ​ | — | ​ | ​ | (70,971) | ​ | ​ | 462,132 | ​ | ​ | 2,671,131 | ​ | ​ | 3,608 | ​ | ​ | (53,695) | ​ | ​ | 2,621,044
Collateralized loan obligations | ​ | ​ | 249,877 | ​ | ​ | 50 | ​ | ​ | (8,606) | ​ | ​ | 241,321 | ​ | ​ | 105,245 | ​ | ​ | 2 | ​ | ​ | — | ​ | ​ | 105,247
Debt securities issued by states and political subdivisions | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 44,185 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 44,185
Total available-for-sale securities | ​ | $ | 3,549,599 | ​ | $ | 50 | ​ | $ | (398,516) | ​ | $ | 3,151,133 | ​ | $ | 8,560,733 | ​ | $ | 24,595 | ​ | $ | (157,296) | ​ | $ | 8,428,032
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency debt securities | ​ | $ | 54,318 | ​ | $ | — | ​ | $ | (5,674) | ​ | $ | 48,644 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 46,302 | ​ | ​ | — | ​ | ​ | (6,294) | ​ | ​ | 40,008 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Residential - Government-sponsored enterprises | ​ | ​ | 106,534 | ​ | ​ | — | ​ | ​ | (12,978) | ​ | ​ | 93,556 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Commercial - Government agency | ​ | ​ | 30,544 | ​ | ​ | — | ​ | ​ | (5,229) | ​ | ​ | 25,315 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Commercial - Government-sponsored enterprises | ​ | ​ | 1,150,449 | ​ | ​ | — | ​ | ​ | (138,451) | ​ | ​ | 1,011,998 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 1,080,492 | ​ | ​ | — | ​ | ​ | (122,378) | ​ | ​ | 958,114 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Government-sponsored enterprises | ​ | ​ | 1,798,178 | ​ | ​ | — | ​ | ​ | (207,045) | ​ | ​ | 1,591,133 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Debt securities issued by states and political subdivisions | ​ | ​ | 53,822 | ​ | ​ | — | ​ | ​ | (7,768) | ​ | ​ | 46,054 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Total held-to-maturity securities | ​ | $ | 4,320,639 | ​ | $ | — | ​ | $ | (505,817) | ​ | $ | 3,814,822 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
​
Schedule of amortized cost and fair value of debt securities by contractual maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022
​ | ​ | Amortized | ​ | Fair
(dollars in thousands) |  | Cost |  | Value
Available-for-sale securities | ​ | ​ | ​ | ​ | ​ | ​
Due in one year or less | ​ | $ | 55,021 | ​ | $ | 54,644
Due after one year through five years | ​ | ​ | 80,163 | ​ | ​ | 76,492
Due after five years through ten years | ​ | ​ | 180,105 | ​ | ​ | 170,568
Due after ten years | ​ | ​ | 164,861 | ​ | ​ | 156,371
​ | ​ | ​ | 480,150 | ​ | ​ | 458,075
​ | ​ | ​ | ​ | ​ | ​ | ​
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 66,792 | ​ | ​ | 59,723
Residential - Government-sponsored enterprises | ​ | ​ | 1,317,718 | ​ | ​ | 1,160,455
Commercial - Government agency | ​ | ​ | 282,700 | ​ | ​ | 237,853
Commercial - Government-sponsored enterprises | ​ | ​ | 130,612 | ​ | ​ | 119,573
Total mortgage-backed securities | ​ | ​ | 1,797,822 | ​ | ​ | 1,577,604
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 738,524 | ​ | ​ | 653,322
Government-sponsored enterprises | ​ | ​ | 533,103 | ​ | ​ | 462,132
Total collateralized mortgage obligations | ​ | ​ | 1,271,627 | ​ | ​ | 1,115,454
Total available-for-sale securities | ​ | $ | 3,549,599 | ​ | $ | 3,151,133
​ | ​ | ​ | ​ | ​ | ​ | ​
Held-to-maturity securities | ​ | ​ | ​ | ​ | ​ | ​
Due in one year or less | ​ | $ | — | ​ | $ | —
Due after one year through five years | ​ | ​ | — | ​ | ​ | —
Due after five years through ten years | ​ | ​ | 10,208 | ​ | ​ | 8,932
Due after ten years | ​ | ​ | 97,932 | ​ | ​ | 85,766
​ | ​ | ​ | 108,140 | ​ | ​ | 94,698
​ | ​ | ​ | ​ | ​ | ​ | ​
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | 46,302 | ​ | ​ | 40,008
Residential - Government-sponsored enterprises | ​ | ​ | 106,534 | ​ | ​ | 93,556
Commercial - Government agency | ​ | ​ | 30,544 | ​ | ​ | 25,315
Commercial - Government-sponsored enterprises | ​ | ​ | 1,150,449 | ​ | ​ | 1,011,998
Total mortgage-backed securities | ​ | ​ | 1,333,829 | ​ | ​ | 1,170,877
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | 1,080,492 | ​ | ​ | 958,114
Government-sponsored enterprises | ​ | ​ | 1,798,178 | ​ | ​ | 1,591,133
Total collateralized mortgage obligations | ​ | ​ | 2,878,670 | ​ | ​ | 2,549,247
Total held-to-maturity securities | ​ | $ | 4,320,639 | ​ | $ | 3,814,822
​
Schedule of gross unrealized losses and fair values of securities in a continuous loss position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Time in Continuous Loss as of December 31, 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 | ​ | $ | (2,962) | ​ | $ | 83,870 | ​ | $ | (9,365) | ​ | $ | 67,112 | ​ | $ | (12,327) | ​ | $ | 150,982
Government-sponsored enterprises debt securities | ​ | ​ | (699) | ​ | ​ | 44,301 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (699) | ​ | ​ | 44,301
Mortgage-backed securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Residential - Government agency | ​ | ​ | (7,069) | ​ | ​ | 59,723 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (7,069) | ​ | ​ | 59,723
Residential - Government-sponsored enterprises | ​ | ​ | (73,954) | ​ | ​ | 645,338 | ​ | ​ | (83,309) | ​ | ​ | 515,117 | ​ | ​ | (157,263) | ​ | ​ | 1,160,455
Commercial - Government agency | ​ | ​ | (15,852) | ​ | ​ | 108,842 | ​ | ​ | (28,995) | ​ | ​ | 129,011 | ​ | ​ | (44,847) | ​ | ​ | 237,853
Commercial - Government-sponsored enterprises | ​ | ​ | (7,348) | ​ | ​ | 94,657 | ​ | ​ | (3,691) | ​ | ​ | 24,916 | ​ | ​ | (11,039) | ​ | ​ | 119,573
Commercial - Non-agency | ​ | ​ | (493) | ​ | ​ | 21,471 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (493) | ​ | ​ | 21,471
Collateralized mortgage obligations: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Government agency | ​ | ​ | (74,797) | ​ | ​ | 596,907 | ​ | ​ | (10,405) | ​ | ​ | 56,415 | ​ | ​ | (85,202) | ​ | ​ | 653,322
Government-sponsored enterprises | ​ | ​ | (21,916) | ​ | ​ | 198,108 | ​ | ​ | (49,055) | ​ | ​ | 264,024 | ​ | ​ | (70,971) | ​ | ​ | 462,132
Collateralized loan obligations | ​ | ​ | (8,606) | ​ | ​ | 170,042 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (8,606) | ​ | ​ | 170,042
Total available-for-sale securities with unrealized losses | ​ | $ | (213,696) | ​ | $ | 2,023,259 | ​ | $ | (184,820) | ​ | $ | 1,056,595 | ​ | $ | (398,516) | ​ | $ | 3,079,854
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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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