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SECURITIES (Tables) | 9 Months Ended
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Sep. 30, 2021
SECURITIES |
Summary of carrying balances of securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | December 31,
​ | ​ | 2021 |  | 2020
​ | ​ | (dollars in thousands)
Debt securities available-for-sale | ​ | $ | 896,218 | ​ | $ | 922,869
Debt securities held-to-maturity | ​ | ​ | 318,730 | ​ | ​ | 68,395
Equity securities with readily determinable fair value | ​ | ​ | 3,366 | ​ | ​ | 3,292
Equity securities with no readily determinable fair value | ​ | ​ | 1,867 | ​ | ​ | 1,552
Total securities | ​ | $ | 1,220,181 | ​ | $ | 996,108
Schedule of gains (losses) on securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
​ |  | 2021 |  | 2020 | ​ | 2021 |  | 2020
​ | ​ | (dollars in thousands)
Net realized gains (losses) on sales | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | —
Net unrealized gains (losses) on equity securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Readily determinable fair value | ​ | ​ | 28 | ​ | ​ | (2) | ​ | ​ | 74 | ​ | ​ | 3
No readily determinable fair value | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | —
Gains (losses) on securities | ​ | $ | 28 | ​ | $ | (2) | ​ | $ | 74 | ​ | $ | 3
Schedule of certain debt securities from the available-for-sale category to the held-to-maturity category | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, 2021 | ​ | March 31, 2021
​ | ​ | Amortized | ​ | ​ | ​ | Amortized | ​ | ​
​ | ​ | Cost | ​ | Fair Value | ​ | Cost |  | Fair Value
​ | ​ | (dollars in thousands)
U.S. government agency | ​ | $ | — | ​ | $ | — | ​ | $ | 7,593 | ​ | $ | 7,323
Mortgage-backed: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency residential | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 8,776 | ​ | ​ | 8,536
Agency commercial | ​ | ​ | 99,271 | ​ | ​ | 99,275 | ​ | ​ | 118,792 | ​ | ​ | 113,861
Total | ​ | $ | 99,271 | ​ | $ | 99,275 | ​ | $ | 135,161 | ​ | $ | 129,720
Schedule of amortized cost and fair values of securities available-for-sale, with gross unrealized gains and losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
September 30, 2021 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available-for-sale: | ​ | (dollars in thousands)
U.S. Treasury | ​ | $ | 59,943 | ​ | $ | 374 | ​ | $ | (22) | ​ | $ | 60,295
U.S. government agency | ​ | ​ | 130,146 | ​ | ​ | 1,842 | ​ | ​ | (2,295) | ​ | ​ | 129,693
Municipal | ​ | ​ | 295,251 | ​ | ​ | 6,232 | ​ | ​ | (2,736) | ​ | ​ | 298,747
Mortgage-backed: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency residential | ​ | ​ | 172,372 | ​ | ​ | 3,111 | ​ | ​ | (371) | ​ | ​ | 175,112
Agency commercial | ​ | ​ | 164,999 | ​ | ​ | 2,002 | ​ | ​ | (1,100) | ​ | ​ | 165,901
Corporate | ​ | ​ | 64,851 | ​ | ​ | 1,899 | ​ | ​ | (280) | ​ | ​ | 66,470
Total available-for-sale | ​ | ​ | 887,562 | ​ | ​ | 15,460 | ​ | ​ | (6,804) | ​ | ​ | 896,218
Held-to-maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agency | ​ | ​ | 12,341 | ​ | ​ | 124 | ​ | ​ | (12) | ​ | ​ | 12,453
Municipal | ​ | ​ | 18,667 | ​ | ​ | 998 | ​ | ​ | — | ​ | ​ | 19,665
Mortgage-backed: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency residential | ​ | ​ | 22,065 | ​ | ​ | 354 | ​ | ​ | (1) | ​ | ​ | 22,418
Agency commercial | ​ | ​ | 265,657 | ​ | ​ | 2,679 | ​ | ​ | (1,716) | ​ | ​ | 266,620
Total held-to-maturity | ​ | ​ | 318,730 | ​ | ​ | 4,155 | ​ | ​ | (1,729) | ​ | ​ | 321,156
Total debt securities | ​ | $ | 1,206,292 | ​ | $ | 19,615 | ​ | $ | (8,533) | ​ | $ | 1,217,374
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2020 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available-for-sale: | ​ | (dollars in thousands)
U.S. government agency | ​ | $ | 118,282 | ​ | $ | 3,720 | ​ | $ | (9) | ​ | $ | 121,993
Municipal | ​ | ​ | 265,309 | ​ | ​ | 9,232 | ​ | ​ | (280) | ​ | ​ | 274,261
Mortgage-backed: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency residential | ​ | ​ | 198,543 | ​ | ​ | 4,871 | ​ | ​ | (162) | ​ | ​ | 203,252
Agency commercial | ​ | ​ | 246,649 | ​ | ​ | 4,651 | ​ | ​ | (534) | ​ | ​ | 250,766
Corporate | ​ | ​ | 70,917 | ​ | ​ | 1,786 | ​ | ​ | (106) | ​ | ​ | 72,597
Total available-for-sale | ​ | ​ | 899,700 | ​ | ​ | 24,260 | ​ | ​ | (1,091) | ​ | ​ | 922,869
Held-to-maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Municipal | ​ | ​ | 22,484 | ​ | ​ | 1,390 | ​ | ​ | — | ​ | ​ | 23,874
Mortgage-backed: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency residential | ​ | ​ | 13,031 | ​ | ​ | 452 | ​ | ​ | — | ​ | ​ | 13,483
Agency commercial | ​ | ​ | 32,880 | ​ | ​ | 2,222 | ​ | ​ | (18) | ​ | ​ | 35,084
Total held-to-maturity | ​ | ​ | 68,395 | ​ | ​ | 4,064 | ​ | ​ | (18) | ​ | ​ | 72,441
Total debt securities | ​ | $ | 968,095 | ​ | $ | 28,324 | ​ | $ | (1,109) | ​ | $ | 995,310
Schedule of amortized cost and fair value of securities by contractual maturity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Available-for-Sale | ​ | Held-to-Maturity
​ |  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
​ | ​ | (dollars in thousands)
Due in 1 year or less | ​ | $ | 37,707 | ​ | $ | 38,206 | ​ | $ | 3,055 | ​ | $ | 3,072
Due after 1 year through 5 years | ​ | ​ | 74,925 | ​ | ​ | 77,508 | ​ | ​ | 17,110 | ​ | ​ | 17,797
Due after 5 years through 10 years | ​ | ​ | 309,565 | ​ | ​ | 311,729 | ​ | ​ | 10,452 | ​ | ​ | 10,844
Due after 10 years | ​ | ​ | 127,994 | ​ | ​ | 127,762 | ​ | ​ | 391 | ​ | ​ | 405
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Mortgage-backed: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency residential | ​ | ​ | 172,372 | ​ | ​ | 175,112 | ​ | ​ | 22,065 | ​ | ​ | 22,418
Agency commercial | ​ | ​ | 164,999 | ​ | ​ | 165,901 | ​ | ​ | 265,657 | ​ | ​ | 266,620
Total | ​ | $ | 887,562 | ​ | $ | 896,218 | ​ | $ | 318,730 | ​ | $ | 321,156
Schedule of gross unrealized losses and fair value of investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Investments in a Continuous Unrealized Loss Position
​ | ​ | Less than 12 Months | ​ | 12 Months or More | ​ | Total
September 30, 2021 |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss |  | Fair Value
Available-for-sale: | ​ | (dollars in thousands)
U.S. Treasury | ​ | $ | (22) | ​ | $ | 9,926 | ​ | $ | — | ​ | $ | — | ​ | $ | (22) | ​ | $ | 9,926
U.S. government agency | ​ | ​ | (2,295) | ​ | ​ | 70,210 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (2,295) | ​ | ​ | 70,210
Municipal | ​ | ​ | (2,066) | ​ | ​ | 112,240 | ​ | ​ | (670) | ​ | ​ | 12,406 | ​ | ​ | (2,736) | ​ | ​ | 124,646
Mortgage-backed: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency residential | ​ | ​ | (323) | ​ | ​ | 47,264 | ​ | ​ | (48) | ​ | ​ | 4,649 | ​ | ​ | (371) | ​ | ​ | 51,913
Agency commercial | ​ | ​ | (983) | ​ | ​ | 89,468 | ​ | ​ | (117) | ​ | ​ | 6,888 | ​ | ​ | (1,100) | ​ | ​ | 96,356
Corporate | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (280) | ​ | ​ | 4,679 | ​ | ​ | (280) | ​ | ​ | 4,679
Total available-for-sale | ​ | ​ | (5,689) | ​ | ​ | 329,108 | ​ | ​ | (1,115) | ​ | ​ | 28,622 | ​ | ​ | (6,804) | ​ | ​ | 357,730
Held-to-maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agency | ​ | ​ | (12) | ​ | ​ | 4,988 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (12) | ​ | ​ | 4,988
Mortgage-backed: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency residential | ​ | ​ | (1) | ​ | ​ | 1,570 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (1) | ​ | ​ | 1,570
Agency commercial | ​ | ​ | (1,596) | ​ | ​ | 127,713 | ​ | ​ | (120) | ​ | ​ | 2,793 | ​ | ​ | (1,716) | ​ | ​ | 130,506
Total held-to-maturity | ​ | ​ | (1,609) | ​ | ​ | 134,271 | ​ | ​ | (120) | ​ | ​ | 2,793 | ​ | ​ | (1,729) | ​ | ​ | 137,064
Total debt securities | ​ | $ | (7,298) | ​ | $ | 463,379 | ​ | $ | (1,235) | ​ | $ | 31,415 | ​ | $ | (8,533) | ​ | $ | 494,794
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Investments in a Continuous Unrealized Loss Position
​ | ​ | Less than 12 Months | ​ | 12 Months or More | ​ | Total
December 31, 2020 |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss |  | Fair Value
Available-for-sale: | ​ | (dollars in thousands)
U.S. government agency | ​ | $ | (9) | ​ | $ | 5,919 | ​ | $ | — | ​ | $ | — | ​ | $ | (9) | ​ | $ | 5,919
Municipal | ​ | ​ | (280) | ​ | ​ | 19,652 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (280) | ​ | ​ | 19,652
Mortgage-backed: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency residential | ​ | ​ | (142) | ​ | ​ | 20,387 | ​ | ​ | (20) | ​ | ​ | 4,490 | ​ | ​ | (162) | ​ | ​ | 24,877
Agency commercial | ​ | ​ | (524) | ​ | ​ | 57,126 | ​ | ​ | (10) | ​ | ​ | 3,449 | ​ | ​ | (534) | ​ | ​ | 60,575
Corporate | ​ | ​ | (106) | ​ | ​ | 4,849 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (106) | ​ | ​ | 4,849
Total available-for-sale | ​ | ​ | (1,061) | ​ | ​ | 107,933 | ​ | ​ | (30) | ​ | ​ | 7,939 | ​ | ​ | (1,091) | ​ | ​ | 115,872
Held-to-maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Mortgage-backed: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency commercial | ​ | ​ | (18) | ​ | ​ | 2,983 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (18) | ​ | ​ | 2,983
Total held-to-maturity | ​ | ​ | (18) | ​ | ​ | 2,983 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (18) | ​ | ​ | 2,983
Total debt securities | ​ | $ | (1,079) | ​ | $ | 110,916 | ​ | $ | (30) | ​ | $ | 7,939 | ​ | $ | (1,109) | ​ | $ | 118,855
Schedule of equity securities with initial cost and carrying values of equity securities, with cumulative net unrealized gains and losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Readily | ​ | No Readily
​ | ​ | Determinable | ​ | Determinable
September 30, 2021 |  | Fair Value |  | Fair Value
​ | ​ | (dollars in thousands)
Initial cost | ​ | $ | 3,098 | ​ | $ | 2,032
Cumulative net unrealized gains (losses) | ​ | ​ | 268 | ​ | ​ | (165)
Carrying value | ​ | $ | 3,366 | ​ | $ | 1,867
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Readily | ​ | No Readily
​ | ​ | Determinable | ​ | Determinable
December 31, 2020 |  | Fair Value |  | Fair Value
​ | ​ | (dollars in thousands)
Initial cost | ​ | $ | 3,098 | ​ | $ | 1,717
Cumulative net unrealized gains (losses) | ​ | ​ | 194 | ​ | ​ | (165)
Carrying value | ​ | $ | 3,292 | ​ | $ | 1,552

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