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SECURITIES (Tables) | 3 Months Ended
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Mar. 31, 2021
SECURITIES |
Summary of carrying balances of securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
​ | ​ | 2021 |  | 2020
​ | ​ | (dollars in thousands)
Debt securities available-for-sale | ​ | $ | 856,835 | ​ | $ | 922,869
Debt securities held-to-maturity | ​ | ​ | 192,994 | ​ | ​ | 68,395
Equity securities with readily determinable fair value | ​ | ​ | 3,332 | ​ | ​ | 3,292
Equity securities with no readily determinable fair value | ​ | ​ | 1,552 | ​ | ​ | 1,552
Total securities | ​ | $ | 1,054,713 | ​ | $ | 996,108
Schedule of gains (losses) on securities | ​
​ | ​ | ​ | ​ | ​ | ​
​ | Three Months Ended March 31,
​ | 2021 |  | 2020
​ | (dollars in thousands)
Net realized gains (losses) on sales | $ | — | ​ | $ | —
Net unrealized gains (losses) on equity securities: | ​ | ​ | ​ | ​ | ​
Readily determinable fair value | ​ | 40 | ​ | ​ | (52)
No readily determinable fair value | ​ | — | ​ | ​ | —
Gains (losses) on securities | $ | 40 | ​ | $ | (52)
Schedule of certain debt securities from the available-for-sale category to the held-to-maturity category | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | ​
​ | ​ | Cost |  | Fair Value
​ | ​ | (dollars in thousands)
U.S. government agency | ​ | $ | 7,593 | ​ | $ | 7,323
Mortgage-backed: | ​ | ​ | ​ | ​ | ​ | ​
Agency residential | ​ | ​ | 8,776 | ​ | ​ | 8,536
Agency commercial | ​ | ​ | 118,792 | ​ | ​ | 113,861
Total | ​ | $ | 135,161 | ​ | $ | 129,720
Schedule of amortized cost and fair values of securities available-for-sale, with gross unrealized gains and losses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
March 31, 2021 |  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available-for-sale: | ​ | (dollars in thousands)
U.S. government agency | ​ | $ | 129,494 | ​ | $ | 1,785 | ​ | $ | (3,341) | ​ | $ | 127,938
Municipal | ​ | ​ | 280,212 | ​ | ​ | 6,479 | ​ | ​ | (4,358) | ​ | ​ | 282,333
Mortgage-backed: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency residential | ​ | ​ | 164,942 | ​ | ​ | 4,366 | ​ | ​ | (204) | ​ | ​ | 169,104
Agency commercial | ​ | ​ | 208,692 | ​ | ​ | 2,861 | ​ | ​ | (3,556) | ​ | ​ | 207,997
Corporate | ​ | ​ | 67,959 | ​ | ​ | 1,950 | ​ | ​ | (446) | ​ | ​ | 69,463
Total available-for-sale | ​ | ​ | 851,299 | ​ | ​ | 17,441 | ​ | ​ | (11,905) | ​ | ​ | 856,835
Held-to-maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agency | ​ | ​ | 7,323 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 7,323
Municipal | ​ | ​ | 21,067 | ​ | ​ | 1,188 | ​ | ​ | — | ​ | ​ | 22,255
Mortgage-backed: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency residential | ​ | ​ | 20,335 | ​ | ​ | 388 | ​ | ​ | — | ​ | ​ | 20,723
Agency commercial | ​ | ​ | 144,269 | ​ | ​ | 1,323 | ​ | ​ | (285) | ​ | ​ | 145,307
Total held-to-maturity | ​ | ​ | 192,994 | ​ | ​ | 2,899 | ​ | ​ | (285) | ​ | ​ | 195,608
Total debt securities | ​ | $ | 1,044,293 | ​ | $ | 20,340 | ​ | $ | (12,190) | ​ | $ | 1,052,443
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
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 | ​ | $ | 31,406 | ​ | $ | 31,734 | ​ | $ | 2,772 | ​ | $ | 2,817
Due after 1 year through 5 years | ​ | ​ | 76,138 | ​ | ​ | 78,807 | ​ | ​ | 12,000 | ​ | ​ | 12,770
Due after 5 years through 10 years | ​ | ​ | 242,096 | ​ | ​ | 242,487 | ​ | ​ | 13,227 | ​ | ​ | 13,580
Due after 10 years | ​ | ​ | 128,025 | ​ | ​ | 126,706 | ​ | ​ | 391 | ​ | ​ | 411
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Mortgage-backed: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency residential | ​ | ​ | 164,942 | ​ | ​ | 169,104 | ​ | ​ | 20,335 | ​ | ​ | 20,723
Agency commercial | ​ | ​ | 208,692 | ​ | ​ | 207,997 | ​ | ​ | 144,269 | ​ | ​ | 145,307
Total | ​ | $ | 851,299 | ​ | $ | 856,835 | ​ | $ | 192,994 | ​ | $ | 195,608
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
March 31, 2021 |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss |  | Fair Value |  | Unrealized Loss |  | Fair Value
Available-for-sale: | ​ | (dollars in thousands)
U.S. government agency | ​ | $ | (3,341) | ​ | $ | 80,395 | ​ | $ | — | ​ | $ | — | ​ | $ | (3,341) | ​ | $ | 80,395
Municipal | ​ | ​ | (4,358) | ​ | ​ | 119,502 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (4,358) | ​ | ​ | 119,502
Mortgage-backed: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency residential | ​ | ​ | (165) | ​ | ​ | 26,810 | ​ | ​ | (39) | ​ | ​ | 3,594 | ​ | ​ | (204) | ​ | ​ | 30,404
Agency commercial | ​ | ​ | (3,556) | ​ | ​ | 119,719 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (3,556) | ​ | ​ | 119,719
Corporate | ​ | ​ | (446) | ​ | ​ | 7,009 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (446) | ​ | ​ | 7,009
Total available-for-sale | ​ | ​ | (11,866) | ​ | ​ | 353,435 | ​ | ​ | (39) | ​ | ​ | 3,594 | ​ | ​ | (11,905) | ​ | ​ | 357,029
Held-to-maturity: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Mortgage-backed: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Agency commercial | ​ | ​ | (285) | ​ | ​ | 7,669 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (285) | ​ | ​ | 7,669
Total held-to-maturity | ​ | ​ | (285) | ​ | ​ | 7,669 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | (285) | ​ | ​ | 7,669
Total debt securities | ​ | $ | (12,151) | ​ | $ | 361,104 | ​ | $ | (39) | ​ | $ | 3,594 | ​ | $ | (12,190) | ​ | $ | 364,698
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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
March 31, 2021 |  | Fair Value |  | Fair Value
​ | ​ | (dollars in thousands)
Initial cost | ​ | $ | 3,098 | ​ | $ | 1,717
Cumulative net unrealized gains (losses) | ​ | ​ | 234 | ​ | ​ | (165)
Carrying value | ​ | $ | 3,332 | ​ | $ | 1,552
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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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