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SECURITIES (Tables) | 12 Months Ended
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Dec. 31, 2021
SECURITIES |
Summary of carrying balances of securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
​ | ​ | 2021 |  | 2020
​ | ​ | (dollars in thousands)
Debt securities available-for-sale | ​ | $ | 942,168 | ​ | $ | 922,869
Debt securities held-to-maturity | ​ | ​ | 336,185 | ​ | ​ | 68,395
Equity securities with readily determinable fair value | ​ | ​ | 3,443 | ​ | ​ | 3,292
Equity securities with no readily determinable fair value | ​ | ​ | 1,927 | ​ | ​ | 1,552
Total securities | ​ | $ | 1,283,723 | ​ | $ | 996,108
Schedule of gains (losses) on securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2021 | ​ | 2020 |  | 2019
​ | ​ | (dollars in thousands)
Net realized gains (losses) on sales | ​ | $ | — | ​ | ​ | — | ​ | $ | —
Net unrealized gains (losses) on equity securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Readily determinable fair value | ​ | ​ | 107 | ​ | ​ | 33 | ​ | ​ | 160
No readily determinable fair value | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (165)
Gains (losses) on securities | ​ | $ | 107 | ​ | ​ | 33 | ​ | $ | (5)
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 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
December 31, 2021 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available-for-sale: | ​ | (dollars in thousands)
U.S. Treasury | ​ | $ | 109,002 | ​ | $ | 328 | ​ | $ | (354) | ​ | $ | 108,976
U.S. government agency | ​ | ​ | 129,269 | ​ | ​ | 1,303 | ​ | ​ | (2,467) | ​ | ​ | 128,105
Municipal | ​ | ​ | 293,837 | ​ | ​ | 6,144 | ​ | ​ | (2,904) | ​ | ​ | 297,077
Mortgage-backed: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency residential | ​ | ​ | 178,236 | ​ | ​ | 2,149 | ​ | ​ | (919) | ​ | ​ | 179,466
Agency commercial | ​ | ​ | 164,875 | ​ | ​ | 1,234 | ​ | ​ | (2,048) | ​ | ​ | 164,061
Corporate | ​ | ​ | 63,141 | ​ | ​ | 1,638 | ​ | ​ | (296) | ​ | ​ | 64,483
Total available-for-sale | ​ | ​ | 938,360 | ​ | ​ | 12,796 | ​ | ​ | (8,988) | ​ | ​ | 942,168
Held-to-maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agency | ​ | ​ | 12,349 | ​ | ​ | 42 | ​ | ​ | (51) | ​ | ​ | 12,340
Municipal | ​ | ​ | 15,666 | ​ | ​ | 809 | ​ | ​ | — | ​ | ​ | 16,475
Mortgage-backed: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency residential | ​ | ​ | 20,555 | ​ | ​ | 196 | ​ | ​ | (102) | ​ | ​ | 20,649
Agency commercial | ​ | ​ | 287,615 | ​ | ​ | 1,749 | ​ | ​ | (2,801) | ​ | ​ | 286,563
Total held-to-maturity | ​ | ​ | 336,185 | ​ | ​ | 2,796 | ​ | ​ | (2,954) | ​ | ​ | 336,027
Total debt securities | ​ | $ | 1,274,545 | ​ | $ | 15,592 | ​ | $ | (11,942) | ​ | $ | 1,278,195
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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 | ​ | $ | 33,315 | ​ | $ | 33,640 | ​ | $ | 2,394 | ​ | $ | 2,410
Due after 1 year through 5 years | ​ | ​ | 110,975 | ​ | ​ | 113,251 | ​ | ​ | 15,887 | ​ | ​ | 16,417
Due after 5 years through 10 years | ​ | ​ | 332,565 | ​ | ​ | 332,954 | ​ | ​ | 9,343 | ​ | ​ | 9,587
Due after 10 years | ​ | ​ | 118,394 | ​ | ​ | 118,796 | ​ | ​ | 391 | ​ | ​ | 401
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Mortgage-backed: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency residential | ​ | ​ | 178,236 | ​ | ​ | 179,466 | ​ | ​ | 20,555 | ​ | ​ | 20,649
Agency commercial | ​ | ​ | 164,875 | ​ | ​ | 164,061 | ​ | ​ | 287,615 | ​ | ​ | 286,563
Total | ​ | $ | 938,360 | ​ | $ | 942,168 | ​ | $ | 336,185 | ​ | $ | 336,027
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
December 31, 2021 |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss |  | Fair Value
Available-for-sale: | ​ | (dollars in thousands)
U.S. Treasury | ​ | $ | (354) | ​ | $ | 68,410 | ​ | $ | — | ​ | $ | — | ​ | $ | (354) | ​ | $ | 68,410
U.S. government agency | ​ | ​ | (2,183) | ​ | ​ | 80,219 | ​ | ​ | (284) | ​ | ​ | 5,578 | ​ | ​ | (2,467) | ​ | ​ | 85,797
Municipal | ​ | ​ | (2,018) | ​ | ​ | 89,424 | ​ | ​ | (886) | ​ | ​ | 17,327 | ​ | ​ | (2,904) | ​ | ​ | 106,751
Mortgage-backed: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency residential | ​ | ​ | (851) | ​ | ​ | 91,703 | ​ | ​ | (68) | ​ | ​ | 4,305 | ​ | ​ | (919) | ​ | ​ | 96,008
Agency commercial | ​ | ​ | (1,921) | ​ | ​ | 113,111 | ​ | ​ | (127) | ​ | ​ | 6,443 | ​ | ​ | (2,048) | ​ | ​ | 119,554
Corporate | ​ | ​ | (7) | ​ | ​ | 2,737 | ​ | ​ | (289) | ​ | ​ | 4,671 | ​ | ​ | (296) | ​ | ​ | 7,408
Total available-for-sale | ​ | ​ | (7,334) | ​ | ​ | 445,604 | ​ | ​ | (1,654) | ​ | ​ | 38,324 | ​ | ​ | (8,988) | ​ | ​ | 483,928
Held-to-maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agency | ​ | ​ | (51) | ​ | ​ | 4,949 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (51) | ​ | ​ | 4,949
Mortgage-backed: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency residential | ​ | ​ | (102) | ​ | ​ | 14,932 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (102) | ​ | ​ | 14,932
Agency commercial | ​ | ​ | (2,673) | ​ | ​ | 174,428 | ​ | ​ | (128) | ​ | ​ | 2,776 | ​ | ​ | (2,801) | ​ | ​ | 177,204
Total held-to-maturity | ​ | ​ | (2,826) | ​ | ​ | 194,309 | ​ | ​ | (128) | ​ | ​ | 2,776 | ​ | ​ | (2,954) | ​ | ​ | 197,085
Total debt securities | ​ | $ | (10,160) | ​ | $ | 639,913 | ​ | $ | (1,782) | ​ | $ | 41,100 | ​ | $ | (11,942) | ​ | $ | 681,013
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
December 31, 2021 |  | Fair Value |  | Fair Value
​ | ​ | (dollars in thousands)
Initial cost | ​ | $ | 3,142 | ​ | $ | 2,092
Cumulative net unrealized gains (losses) | ​ | ​ | 301 | ​ | ​ | (165)
Carrying value | ​ | $ | 3,443 | ​ | $ | 1,927
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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

X
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